seagate ST15150FC Installation guide

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Barracuda 4FC Disc Drive

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ST15150FC

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Product Manual, Volume 1

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Barracuda 4FC Disc Drive

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ST15150FC

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Product Manual, Volume 1

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September 1995 Publication number: 83329080, Rev. A Seagate®, Seagate Technology®, and the Seagate logo are registered trademarks of Seagate

Technology, Inc. Elite

, SeaFAXTM, SeaFONETM, SeaTDDTM, and SeaBOARDTM are trademarks of Seagate Technology, Inc. Other product names are registered trademarks or trademarks of their owners.

No part of this publication may be reproduced in any form without written permission from Seagate Technology, Inc.

Printed in the United States of America

Revision status summary sheet

Revision Date Writer/Engineer Sheets Affected

A (draft 1) 4/14/95 L. Newman/J. Coomes All A (draft 2) 4/17/95 L. Newman/J. Coomes All A (draft 3) 4/27/95 L. Newman/J. Coomes All A (draft 4) 5/22/95 L. Newman/J. Coomes All A (draft 5) 6/19/95 L. Newman/J. Coomes All A (draft 6) 8/24/95 L. Newman/J. Coomes All A 9/5/95 L. Newman/J. Coomes All

ST15150FC Product Manual, Rev. A vii

Contents

1.0 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2.0 Applicable standards and reference documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.1 Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.2 Reference documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

3.0 General description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.1 Standard features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.2 Media description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.3 Performance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.4 Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.5 Unformatted and formatted capacities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.6 Factory-installed accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.7 Factory-installed options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.8 User-installed accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4.0 Performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.1 Internal drive characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.2 Seek performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.3 Thermal calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.3.1 Seek time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4.3.2 Format command execution time for ≥ 512-byte sectors . . . . . . . . . . . . . . . . . . . . 10

4.3.3 General performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4.4 Start/stop time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4.5 Prefetch/multi-segmented cache control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4.6 Cache operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4.6.1 Caching write data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.7 Synchronized spindle operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5.0 Reliability specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.1 Error rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.1.1 Environmental interference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.1.2 Interface errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.1.3 Write errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.1.4 Seek errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.2 Reliability and service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.2.1 Mean time between failure (MTBF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.2.2 Preventive maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.2.3 Service life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.2.4 Service philosophy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.2.5 Service tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.2.6 Product warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.2.7 Hot plugging the drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

6.0 Physical/electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

6.1 AC power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

6.2 DC power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

6.2.1 Conducted noise immunity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

6.2.2 Power sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

6.2.3 12V current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

6.3 Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

6.4 Environmental limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

6.4.1 Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

6.4.2 Relative humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

6.4.3 Effective altitude (sea level reference) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

6.4.4 Shock and vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

6.4.5 Air cleanliness. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

viii ST15150FC Product Manual, Rev. A

6.5 Electromagnetic susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

6.6 Mechanical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

7.0 Defect and error management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

7.1 Drive internal defects/errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

8.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

8.1 Drive ID/option selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

8.2 LED connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

8.2.1 J20 connector requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

8.3 Drive orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

8.4 Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

8.4.1 Air flow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

8.5 Drive mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

8.6 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

9.0 Interface requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

9.1 General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

9.2 FC-AL features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

9.2.1 Fibre Channel link service frames . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

9.2.2 Fibre Channel task management functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

9.2.3 Fibre Channel task management responses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

9.2.4 Fibre Channel port login. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

9.2.5 Fibre Channel port login accept. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

9.2.6 Fibre Channel Process Login (PRLI). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

9.2.7 Fibre Channel Process Accept (ACC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

9.2.8 Fibre Channel Arbitrated Loop options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

9.3 Dual port support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

9.4 SCSI interface commands supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

9.4.1 Inquiry data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

9.4.2 Mode Sense data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

9.5 Miscellaneous operating features and conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

9.6 FC-AL physical interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

9.6.1 Physical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

9.6.2 Connector requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

9.6.3 Electrical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

9.6.4 Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

9.6.5 Synchronized spindles interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44

9.7 Signal characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48

9.7.1 TTL input characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48

9.7.2 LED driver signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48

9.7.3 Low drive LED signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48

9.7.4 Differential PECL output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48

9.7.5 Differential PECL input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49

10.0 Technical support services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

ST15150FC Product Manual, Rev. A 1

1.0 Scope

This manual describes Seagate Barracuda 4FC (Fibre Channel) disc drives. Barracuda 4FC drives support the Fibre Ch annel Arbitrate d Loop and S CSI Fi bre Chan nel Pro tocol specif ica-

tions to the extent des cribed in th is manu al. The

77767496) describes the general Fibre Channel Arbitrated Loop characteristics of this and other Seagate Fibre Channel drives.

Fibre Channel Arbitrated Loop Prod uct Manu al

(part number

Figure 1. Barracuda 4FC family disc drive

ST15150FC Product Manual, Rev. A 3

2.0 Applicable standards and reference documentation

Seagate takes all reasonable steps to insure that its produ cts are certifiable to currently a ccepted standards. Typical applications of these disc drives include customer packaging and subsystem design.

Safety agencies conditionally certify compon ent assemblies, such as the Barracuda 4FC disc drive, based on their final acceptability in the end-use product. The subsystem designer is responsible for meeting these conditions of acceptability in obtaining safety/reg ulatory agency compliance in their end use product and certifying where required by law.

2.1 Standards

The Barracuda 4FC disc drive is designed to be a UL recognized compon ent per UL1950, CSA certified to CSA C22.2 No 950-M89, and VDE certified to VDE 0805 and EN60950.

The Barracuda 4FC disc drive is supplied as a component part. It is the responsibility of the subsystem designer to meet EMC/regulatory requirements established by the FCC, DOC, and VDE. Engineering test characterizations of radiated emissions are available from the Seagate safety department.

2.2 Reference documents

ST15150FC Installation Guide

Seagate part number: 83329070

Fibre Channel Arbitrated Loop (FC-AL) Product Manual

Seagate part number: 77767496

SCSI Interface Product Manual

Seagate part number: 77738479

ANSI Fibre Channel Documents

X3.230-199x FC Physical and Signaling Interface (FC-PH) X3.xxx-199x FC Arbitrated Loop (FC-AL) X3T10-993.D Fibre Channel Protocol for SCSI (FCP) TBD Direct Disk Attachment Profile

ANSI Small Computer System Interface (SCSI) Documents

X3T9.2/86-109 Rev. 10H (SCSI-2) X3T10-994D (SCSI-3) Architecture Model

In case of conflict between this document and any referenced document, this document takes precedence.

ST15150FC Product Manual, Rev. A 5

3.0 General description

Barracuda 4FC drives are random access storage devices designed to support the Fibre Channel Arbitrated Loop (FC-AL) and SCSI Fib re Channel Protocol as described in the ANSI specificati ons, this document, and

Fibre Channel Arbitrated Loop Product Manual

the face characteristics of this drive.

You can view the Fibre Channel interface simply as a transport vehicle for the supported command set (ST15150FC drives use the SCSI command set). In fact, the Fibre Channel interface is unaware of the content or meaning of the information be ing transported. It simply packs the SCSI comma nds in packets, transports them to the appropriate devices, and provides error checking to ensure that the information reaches its dest ination accurately. Refer to the documents referenced in Se ct ion 2.2 if you require additional information about the Fibre Channel interface, FC-AL topology, or the SCSI fibre channel protocol.

The head and disc assembly (HDA) is environm entally sealed at the factory. Air recirculates within the HDA through a non-replaceable filter to maintain a contamination-free HDA environment.

Refer to Figure 2 for an explode d view of the drive. Never disassemble the HDA . This exploded view is for information only. Do not attempt to service items in the sealed en closure (hea ds, media, actuat or, etc.) as this requires special facilitie s. The drive contains no p arts replaceable by the user and opening the HDA for any reason voids your warranty.

(part number 77767496) which describes the general inter-

Figure 2. Barracuda 4FC disc drive

Barracuda 4FC drives use a dedicated landing zone at the innermo st radi us of the me dia to eli minate the pos sibility of destroying or degrading data by landing in the data zone. The head s automatical ly go to the landing zone when power is removed from the drive.

An automatic shipping lock prevents potential damage to the heads and discs that results from movement during shipping and handling. The shippin g lock disengages and the head load process begins when power is applied to the drive.

Barracuda 4FC drives decode track 0 locat ion data from the dedicate d servo surface to eliminate mechanical transducer adjustments and related reliability concerns.

The drives also use a high-performance actu ator assembly design that provides excellent performance with minimum power dissipation.

6 ST15150FC Product Manual, Rev. A

3.1 Standard features

Barracuda 4FC drives have the following standard features:

• Integrated dual port FC-AL controller

• Support for FC-AL (Fibre Channel Arbitrated Loop)

• Differential copper FC drivers and receivers

• Downloadable firmware using the FC-AL interface

• Drive selection ID and configurati on options are set on the FC-AL backpanel , T-card, or through interface

commands. Jumpers are not required on the drive.

• FC world-wide name uniquely identifies the drive and each port

• Supports up to 16 initiators

• User-selectable logical block size (180 to 4,096 bytes)

• Reallocation of defects on command (Post Format)

• User-selectable number of spare sectors per cylinder

• Industry standard 3.5-inch full-high form factor dimensions

• Programmable sector realloca tion scheme

• Flawed sector reallocation at format time

• Programmable autowrite and read reallocation

• Reallocation of defects on command (post format)

• 96-bit Reed-Solomon error correction code

• Sealed head and disc assembly (HDA)

• No preventive maintenance or adjustments required

• Dedicated head landing zone

• Automatic shipping lock

• Automatic thermal compensation

• Embedded Grey Code track address to eliminate seek errors

• Self-diagnostics performed at power on

• 1:1 interleave

• Zone bit recording (ZBR)

• Vertical, horizontal, or top down mounting

• Dynamic spindle brake

• 998 Kbyte data buffer

3.2 Media description

The media used on the dri ve has a diameter of approximately 95 m m (approximately 3.7 inches). The alum inum substrate is coated with a thin film ma gnetic material, overcoated with a proprietary protecti ve layer for improved durability and environmental protection.

3.3 Performance

• Programmable multi-segmentable cache buffer

• 106.3 Mbytes/sec maximum instantaneous data transfers

• 7,200 RPM spindle; average latency = 4.17 msec

• Command queuing of up to 64 commands

• Background processing of queue

• Supports start and stop commands

• Provides synchronized spindle capability

• Adaptive seek velocity; improved seek performance

3.4 Reliability

• 800,000 hour MTBF (Class A computer room environment)

• Fibre Channel (FC) interface transports SCSI protocol through CRC protected frames

• LSI circuitry

• Balanced low mass rotary voice coil actuator

ST15150FC Product Manual, Rev. A 7

3.5 Unformatted and formatted capacities

The standard OEM models are formatted to 512 bytes per block. ST15150FC drives have nine (9) spare sectors per cylinder and one (1) spare cylinder per unit.

Formatted Unformatted

ST15150FC 4,294 Mbytes 5,062 Mbytes

Users having the necessary equipment may modi fy the data bl ock size before issuing a format command an d obtain different formatted capacities than those listed. User-available capacity also depends on the spare reallocation scheme you select. See the Mode Select command and the Fo rmat command in the

Arbitrated Loop Product Manual

(part number 77767496).

Fibre Channel

3.6 Factory-installed accessories

OEM standard drives are shipped with the Barracuda 4FC Installation Guide (part number 83329070).

3.7 Factory-installed options

You may order the following items which are incorporated at the manufacturing facility during production or packaged before shipping:

• Black plastic front panel with green lens (part number 70553702).*

• Black plastic front panel with red lens (part number 70553701).*

• Single-unit shipping pack. The drive is normally shipp ed in bulk packaging to provide maximum protection against transit damage. Units shipped individually require additional protection as provided by the single unit shipping pack. Users planning single unit distribution should specify this option.

• ST15150FC Installation Guide, part number 83329070.

*You may order other front panel colors. Each panel has a single rectangul ar LED indicator lens that, when

glowing, indicates the drive is selected.

3.8 User-installed accessories

The following accessories are available. All kits may be installed in the field.

• Front panel kit (green lens), part number 70869751.

• Single-unit shipping pack kit.

• Adapter accessory frame kit, part number 75790701. (adapts a 3.5-inch drive to fit in a 5.25-inch drive mounting space). This kit contains the frame to allow a 3.5-inch drive to be mounted in a 5.25-inch drive bay. It includes mounting hardware, front panel with a green lens, an LED with cable that connects to the remote LE D connector, and installation instructions.

• Evaluation kit, part number 70935895. This kit provides an adapter card ( “T-card”) to allow cable con necti ons fo r two FC inte rfaces an d D C p ower. T wo twin axial cables, 6-feet in length, are included for the input and output connections to the FC interfaces. A small DC fan is included for cooling.

ST15150FC Product Manual, Rev. A 9

4.0 Performance characteristics

This section provides detailed information concerning performance-related characteristics and features of Barracuda 4FC drives.

4.1 Internal drive characteristics

ST15150FC

Drive capacity 5.062..................................Gbytes (unformatted)

Read/write data heads 21

Bytes per track 64,160................................Bytes (average)

Bytes per surface 232.4..................................Mbytes (unformatted)

Cylinders/tracks per surface 3,711..................................Tracks (user accessible)

Tracks per inch 4,048..................................TPI

Bits per inch 73,820................................BPI

Servo heads 1

Internal data rate 47.5 - 72.0.........................Mbytes/sec (variable with zone)

Disc rotation speed 7,200 ± 0.5%.....................rpm

Avg rotational latency 4.17....................................msec

4.2 Seek performance characteristics

All performance characteristics assume that the rmal calibration is not in process when th e SCSI command is received. A SCSI command being executed is not interrup ted for therma l calib ratio n. If therma l calib ratio n is in process when a SCSI command is received, the command is queu ed until the compensation for the specific head being calibrated com pletes. When compensation completes for the spe cific head being calibrated, the first queued SCSI command is executed.

Refer to paragraph 9.6, “FC-AL physical interface” and to the

Fibre Channel Arbitrat ed Loop Product Manual

(part number 77767496) for additional timing details.

4.3 Thermal calibration

ST15150FC drives use an automatic therma l calibrati on (TCAL) process to mai ntain a ccurate head al ignmen t with the data cylinders. The host s ytem may choose to allow the drive to perform TCAL at th e drive’s predefined intervals or the Rezero Unit command may be issued by the host to reset the TCAL timer so that the host knows when the TCAL will occur.

1. At power up and following a SCSI reset, the drive calibrate s al l of the he ads before any re ad or write co m-

mands are processed. All heads are also calibrated during the SCSI Rezero Unit command.

2. The drive delays 300 seconds before initiating any TCALs. No TCALs occur during this delay period.

3. A single-head TCAL is then scheduled at 7.1 second intervals.

4. After the drive TCALs all of the heads, the interval is increased to schedule a single head TCAL every 14.3

seconds.

5. The drive attempts to find an idle period of 25 to 50 milliseconds prior to performing a single head TCAL. If

this TCAL is delayed for another interval of time, the drive forces the TCAL at the next command boundary. This guarantees that no head will remain uncalibrated for more than 600 seconds (2 * 21 heads * 14.3 seconds per head) and that no TCALs are closer together than the interval time.

Note. Any TCAL performed during the “standard” retry sequence is limited to the failing head and is disabled

if the host has selects a retry count of zero.

10 ST15150FC Product Manual, Rev. A

4.3.1 Seek time

Including drive

controller overhead Drive level (msec) (msec) Read Write Read Write

Average typical Single track typical Full stroke typical

1. Rate measured from the start of the first sector transfer to or from the host.

2. Typical seek values are measured under nominal conditions of temperature, voltage, and horizontal orientation as measured on a representative sample of drives.

8.09.09.010.0

0.60.91.61.9 17 19 18.0 20.0

4.3.2 Format command execution time for ≥ 512-byte sectors

Maximum (with verify) 60 minutes Maximum (without verify) 40 minutes

4.3.3 General performance characteristics

Minimum sector interleave 1 to 1 Data buffer to/from disc media (512-byte sector)

Data transfer burst rate (≤ 1 sector) Min

Max

5.30 Mbytes/sec*

8.94 Mbytes/sec*

Data transfer sustained rate (< 1 track) Min (divided by interleave factor)

Max (divided by interleave factor)

FC-AL interface data

Maximum instantaneous transfer rate 106.3 Mbytes/sec

Sector sizes

Default is 512-byte data blocks Variable (180- to 4,096-bytes) in multiples of four bytes

Read/write consecutive sectors on a track Yes Flaw reallocation performance impact (for flaws reallocated using the

spare sectors per track reallocation scheme Flaw reallocation performance impact (for flaws reallocated using the

spare sectors per cylinder reallocation scheme) Flaw reallocation performance impact (for flaws reallocated using the

spare tracks per volume reallocation scheme Overhead time for head switch (512 byte sectors) 0.7 msec Overhead time for one track cylinder switch 1.6 msec (typical) Average rotational latency 4.17 msec *Assumes no errors and no relocated sector s.

3.56 Mbytes/sec*

7.65 Mbytes/sec*

Negligible

35 msec (typical)

4.4 Start/stop time

If the Motor Start optio n is disa bled, the drive b ecomes ready w ith 30 seconds after DC power i s applied. If a recoverable error condition is detected during the start sequence, the drive executes a recovery procedure and the time to become ready may exceed 30 seconds. During the st art sequence, the drive responds to some commands over the FC-AL interface. Stop time is less than 30 seconds (maximum) from removal of DC power.

ST15150FC Product Manual, Rev. A 11

If the Motor Start option is ena bl ed, the int ernal control ler accep ts the comm ands l isted in the

Product Manual

been received, the drive becomes ready for normal operations within 30 seconds (excluding the error recovery procedure). The Motor Start command can also be used to co mmand the dri ve to stop the spindl e (see Start/ Stop command information in the

There is no power control switch on the drive.

4.5 Prefetch/multi-segmented cache control

The drive provides a prefetch/multi-segmented cache algo rithm that in many cases can enhance system performance. To sel ect t his featu re th e host sen ds th e M ode Sel ect com man d w ith the p roper val ues in the ap pl icable bytes in page 08h (see the cache enabled.

4.6 Cache operation

Of the 1,024 Kbytes physical buffer space in the drive, 998 Kbytes can be used as a cache. The cache can be divided into logical segments from which data is read and to which data is written.

The drive keeps track of the logical block addresses of the data stored in each segment of the cache. If the cache is enabled (see RCD bit in the host with a read command is retrieved f rom the cache, i f possible, befo re any disc access is initiate d. Data in contiguous logical blocks immediately beyond that requested by the Read command can be retrieved and stored in the cache for immediate transfer to the initiator on subsequent read commands. This is referred to as the prefetch operation. Since data that is prefetched may replace data alrea dy in the cache segment, an in iti ator can limit the amount of prefetch data to optimize system pe rformance. The drive never prefetches more sectors than the number specified in bytes 8 and 9 of Mode page 08h (see

Product Manual

writes, with no prefetch operation and no segmented cache operation.

less than 3 seco nds after DC power has been ap plied. After the Motor Start com mand has

Fibre Channel Arbitrated Loop Product Manual

Fibre Channel Arbitrated Lo op Product Manu al

). Default is prefetch and read

), data requested by the

Fibre Channel Arbitrated Loop

). If the cache is not enabl ed, 998 Kbytes of the buffer are used as a circular buffer for read/

FC-AL Interface

The following is a simplified description of the prefetch/cache operation: Case A—read command is received and the first logical block is already in cache:

1. Drive transfers to the initiator the first logical block requested plus all subsequent contiguous logical blocks that are already in the cache. This data may be in multiple segments.

2. When a requested logical bl oc k is reached t hat i s not i n any seg men t, the drive fe t ches it a nd any re mai ning requested logical block addresses from t he disc and puts them in a segment of the cache. The d rive transfers the remaining requested logical blocks from the cache to the initiator in accordance with the “buffer-full” ratio specification given in Mode Select Di sconnect/Re connect pa ramete rs, page 02h (see the

Fibre Channel Arbitrated Loop Product Manual

3. The drive prefetches additional logical blocks contiguo us to those transferred in step 2 above and stores them in the segment. The drive stops filling the segment when the maximum p refetch value has been transferred (see the

Case B—read command is received an d th e fi r st log ical block address reque ste d is not in a ny segm ent o f th e cache.

1. The drive fetches the requested logical blocks from the d isc and transfers them into a segme nt, and the n from there to the initiator in accordance with the “buffer-full” ratio specifi cation given in Mode Select Disconnect/Reconnect parameters, page 02h (see the

2. The drive prefetches additional logical blocks contiguous to those transferred in Case A, step 2 above and stores them in the segment. The drive stops filling the segment when the maximum prefetch value has been transferred.

During a prefetch, the drive crosses a cyli nde r bou nda ry to fe tch da ta o nl y if the Disconti nui ty (DIS C) bi t is set to 1 in bit 4 of byte 2 of the Mode Select parameters page 8h. De fault is zero for bit 4 (see the

Arbitrated Loop Product Manual

Fibre Channel Arbitrated Loop Product Manual

Fibre Channel

Each cache segment is actually a self-contained circul ar buffer whose length is an integer num ber of sectors. The wrap-around capability of the individual segments greatly enhances the cache’s overall performance, allowing a wide range of user-selectable configurations. The drive supports operation of any integer number of

12 ST15150FC Product Manual, Rev. A

segments from 1 to 16. Divide the 998 Kbytes in the buffer by the number of segments to get the segment size. Default is 3 segments. (See the

Fibre Channel Arbitrated Loop Product Manual.

)

4.6.1 Caching write data

Write caching is a write operation by the drive that makes use of a drive buffer storage area where the data to be written to the medium is stored while the drive performs the Write command.

Write caching is enabled independently of read caching. The default write cache setting for ST15150FC drives is with write caching disabled. To enable the write cache, use the Write Caching Enable (WCE) bit.

For write caching, the same buffer space and segmentatio n is used as set up for rea d fun cti ons. When a writ e command is issued, the cache is first checked to see if any logical b locks that are to be written are already stored in the cache from a previous read o r write command. If there are, the respective cache segments are cleared. The new data is cached for subsequent read commands.

If a 10-byte CDB Write command (2Ah) is issued with the data page out (DPO) bit set to 1, no write data is cached, but the cache segmen ts are still checked and cleared, if need be, for any logi cal blocks that are bein g written (see the

Fibre Channel Arbitrated Loop Product Manual

If the number of write data logical blocks exceeds the size of the segment being written into when the e nd of the segment is reached, the data is written into the beginning of the same cache segment, overwriting the data that was written there at the beginning of the operation. However, the drive does not overwrite data that has not yet been written to the medium.

4.7 Synchronized spindle operation

Synchronized spindle operation allows several drives operating from the same host to operate their spindles at the same synchronized rotational rate. Drives operating in a system in synchronized mode increase the system capacity and transfer rate in a cost-effective manner.

The spindle sync signal is routed in the backpanel to connect th e dri ves in the synchroni zed s ystem as show n in Figure 3.

Each drive in the system can be configured by the host (using a Mode Select command) to ope rate in either the master or slave mode. Drives can be re-configured by the host any time after power-up to be master or slave by use of the Mode Se lect command Rigid Disc Drive Ge ometry page. The master provides the reference signal to which all other drives phase-lock, including the master. There is only one master per system, and that can be a drive or the host computer. All drives may be configured as slaves allowing the host to provide the reference signal.

Each drive can be configured for the non-synchronized mode in which it ignores any re ference signal that might be present—this is the de fault mode as shipped from the facto ry. The connection of the synchronized reference signal to the host is required only if the host is to provide the reference signal. If the ho st does not provide the reference signal, the host should not be connected.

Sync Interface

Master Sync

Source

Host

(or other drive)

System

Interface

Spindle Control

+5V

Drive 1

Spindle Control

+5V

Drive 2

Figure 3. Synchronized drive interconne ct d iagram

Spindle Control

+5V

Drive n

ST15150FC Product Manual, Rev. A 13

Rotational Position Locking Note. Mode Select page 4, byte 17, bits 1 and 0.

RPL Description 00b Indicates that spindle synchronization is disabled (default val ue) 01b The target operates as a synchronized spindle slave 10b The target operates as a synchronized spindle master 11b The target operates as a synchronized spindle master control

(not supported by the disc drive)

The Pike LSI on the master drive provides the reference signal (SSREF+). The index signal generates a 120 Hz signal. The signal is normally false/negated (nominal 0V) and makes a transition to the true/asserted (nominal +5V) level to indicate the re ference p ositi on d urin g the revolu tio n pe riod. The m aster and slave d rives use the trailing (falling) edge of the reference signal to phase-lock their spindles. A maxi mum of 10 seconds is allowed for a slave to synchronize with the reference signal.

Figure 4 shows the characteristics of the reference signal.

SSREF +

T = 0.0083 second (± 1.0% max); ± 10 µsec cycle to cycle variance; ± 20 µsec phase error while synchronized

1 0

1.0 µsec min.

1.37 µsec max.

Figure 4. Synchronized reference signal characteristics

SCSI factors

The Rotational Position Lockin g (RPL) field in byte 17 (bits 0 and 1) of the Rigid Disc Drive Geometry mode parameters page (page 04h) is used for enabling and disabling spindle synchronization mode (see the

Channel Arbitrated Loop Prod uct Manual

). When the target achieves synchronizatio n, it creates a unit atten-

Fibre

tion to all initiators. The sense key is set to Unit Attention and the additiona l sense code set to Spindles Synchronized (5C01).

If subsequent to achieving synchronization the target detects a change of synchronization and:

1. If the logical unit is not executi ng an I/O process for the initiat or, the target creates a unit attention condition. The sense key is set to Unit Attention and the addi tional sense code set to Spindle Synchronized (5C01) or Spindle Not Synchronized (5C02).

2. If the logical unit is executing an I/O process and no other error occurs, the target returns Check Condition status. The sense key is set to Recovered Error if the target is able to complete th e I/O process or Hardware Error if the target is unable to complete the I/O process. The additional sense code is set to Spindles Synchronized (5C01) or Spindles Not Synchronized (5C02).

The drive may be operated with a rotational skew when synchronized. The rotational skew is applied in the retarded direction (lagging the synchronized spind le master control). A rotational offset of up to 2 55/256 of a revolution lagging ma y be selected. The amount of offset is selecte d by using the Mode Select command, Rigid Disc Drive Geometry page (pag e 04), byte 18 ( see the

Fibre Channel Arbitrated Loop Product Manua l

The value in byte 18 (0-FFh) is the numerator o f a fractional multiplier that has 256 a s the denominator. For example, 40h selects 40h/FFh or 1/4 of a revolution lagging skew; 80h selects 1/2 revolution lagging skew, etc. Since the drive supports all offset values from 0 to 255, values sent by the initiator are not rounded off. The drive translation of the digital offset values to physical rotational offsets results in offset values wh ose phase error lies within the ±20 µsec phase error with respect to the supplied 120 Hz reference signal.

The drive does not have the capability to adjust the rot atio nal offset value reque sted by the ini tiator to a physical offset in the drive that corresponds in any way to sector bound arie s or changes in ZBR zon es. Such correspondences or changes, if required, must b e formulated by the initiator for it to calculate the val ue of offset it sends to the drive.

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