HP XP12000 User guide

HP StorageWorks

XP12000 Disk Array

site preparation guide

third edition (May 2005)

part number: AE002-96011

This guide contains site preparation information for the HP StorageWorks XP12000 Disk Array.

implied warranties of merchantability and fitness for a particular purpose. Hewlett-Packard shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material.

This document contains proprietary information, which is protected by copyright. No part of this document may be photocopied, reproduced, or translated into another language without the prior written consent of Hewlett-Packard. The information contained in this document is subject to change without notice.

Product names mentioned herein may be trademarks of their respective companies. Hewlett-Packard Company shall not be liable for technical or editorial errors or omissions contained herein. The

information is provided “as is” without warranty of any kind and is subject to change without notice. The warranties for Hewlett-Packard Company products are set forth in the express limited warranty statements accompanying such products. Nothing herein should be construed as constituting an additional warranty.

Printed in the U.S.A.

HP StorageWorks XP12000 Disk Array Site Preparation Guide

third edition (May 2005) part number: AE002-96011

2 HP StorageWorks XP12000 Disk Array Site Preparation Guide

About this guide 7

Related information 7 Document conventions and symbols 7 Getting help 8 HP technical support 8 HP storage web site 8 HP authorized reseller 9 Revision history 10

1 Site Prep Team and Tasks 11

The site prep team 12

HP representatives 12 Customer 12

Site prep tasks 13

Site prep checklist 13 Site prep time allowances 16

2 Site Requirements 17

Disk array physical specifications 18

Dimensions 19 Weights 19 Calculating the weight of your disk array configuration 22 Weight calculation example 24

General computer room requirements 25

Preventing electrostatic discharge 25

Safety requirements 27

Fire safety 27 Equipment servicing hazards 27

Contents 3

Raised floor requirements 28

Floor covering 29 Floor cutouts 29

Space planning requirements 32

The space planning process 32 Floor clearance 33

Environmental requirements 46

Altitude 46 Air conditioning 46 Temperature 47 Humidity 47 Mechanical vibration 48 Shock 49 Heat dissipation and power consumption 49 Acoustics 50 Dust and pollution control 50

Metallic particulate contamination 50 Data comm requirements 52 Electrical requirements 53

Line voltage 53

Branch circuit breakers 53

Frequency 54

Safety and dedicated ground 54

Grounding requirements 54

Receptacles 55

Power line transients 56

Maximum peak inrush and crest factor 57

Uninterruptible power supply (UPS) 58

Sources of electrical interference 59 Delivery space requirements 60

3 Delivery and Unpacking 61

Checking for shipping shortage and damage 62 Unpacking the equipment 63

Packaging configurations 63

Required personnel 63

Required tools 63

Unpacking process 64

4 HP StorageWorks XP12000 Disk Array Site Preparation Guide

A Electrical Specifications 69

AC line voltage requirements 70

50-amp, single-phase DKC 70 30-amp, single-phase DKC 70 30-amp, three-phase DKC 71 50-amp, single-phase DKU 71 30-amp, single-phase DKU 72

30-amp, three-phase DKU 72 Receptacle part numbers and ordering information 73 Three-phase cabling for the USA (60 Hz) 74

Connecting the external power-supply cords 74

Branch circuit requirements 75 Three-phase AC cabling for Europe (50 Hz) 76

Connecting the power-supply cords 76

Branch circuit requirements 77 Single-phase AC cabling for the USA 78

Connecting the power-supply cords 78

Branch circuit requirements 80 Single-phase cabling for Europe 81

Connecting the power-supply cords 81

Branch circuit requirements 82

Glossary 83

Index 95

Contents 5

6 HP StorageWorks XP12000 Disk Array Site Preparation Guide

About this guide

This guide is intended for anyone participating in preparing a site for the installation of an HP StorageWorks XP12000 Disk Array.

Unless otherwise noted, the term disk array refers to the HP StorageWorks XP12000 Disk Array.

Related information

For related product documentation, see the HP StorageWorks XP12000 Disk Array Owner’s Guide on the HP web site:

Document conventions and symbols

Table 1. Document conventions

Convention Element

Blue text (Figure 1) Cross-reference links

Bold Menu items, button names, key names, tab names, and group box names

www.hp.com

Italics Text emphasis and document titles

Blue underlined sans serif font (www.hp.com

About this guide 7

)

Caution Failure to follow directions could result in hardware or software damage.

Web site addresses

Warning

Failure to follow directions could result in personal injury or death.

Getting help

If you have additional questions, contact your HP sales representative (HP SR) or visit the HP web site:

HP technical support

In North America, call technical support at 1-800-652-6672, available 24 hours a day, 7 days a week.

Outside North America, call technical support at the location nearest you. The HP web site lists telephone numbers for worldwide technical support:

www.hp.com/country/us/eng/support.html

Have the following information available before calling:

www.hp.com

• Technical support registration number (if applicable)

• Product serial numbers

• Product model names and numbers

• Applicable error messages

• Operating system type and revision level

• Detailed questions

For continuous quality improvement, calls may be recorded or monitored.

HP storage web site

For the most current information about HP StorageWorks XP products:

http://h18006.www1.hp.com/storage/arraysystems.html

8 HP StorageWorks XP12000 Disk Array Site Preparation Guide

HP authorized reseller

To obtain the name of your nearest HP authorized reseller:

United States 1-800-345-1518

Canada 1-800-263-5868

elsewhere See the HP web site for locations and telephone

numbers:

www.hp.com

About this guide 9

Revision history

September 2004 First edition

March 2005 Second edition

May 2005 Third edition

10 HP StorageWorks XP12000 Disk Array Site Preparation Guide

Site Prep Team and Tasks

The objective of a site prep is to prepare your site for the successful and timely installation of the HP XP12000 disk array. Proper site preparation is vital for the reliability of the disk array.

Site prep involves a careful balance of equipment design criteria, site environmental variables, your business needs, and your budget constraints.

In addition to this guide, other site prep resources may be available to you. The HP service organization is committed to making sure you receive maximum benefit from your disk array. HP representatives will guide and assist you throughout the site prep process.

Site Prep Team and Tasks 11

The site prep team

The site prep team plans, schedules, and completes all tasks necessary to prepare your site for successful disk array installation.

The site prep team consists of HP representatives and you, the customer.

HP representatives

The HP team includes various HP representatives who have the training, knowledge, experience, tools, and parts required to install and maintain XP disk arrays. This team:

• Helps you to determine and implement the site requirements for your specific site and array configuration

• Coordinates all HP resources to ensure successful delivery and installation of the disk array

Your HP SR is your primary point of contact with HP during the site preparation process.

Customer

As part of the site prep team, your responsibilities include planning and preparing a suitable environment for the disk array, and scheduling equipment delivery and installation. However, HP representatives are available to help you throughout the site prep process. Your internal site team may include personnel specializing in your site computer room, such as your storage administrator and your site electrician.

12 HP StorageWorks XP12000 Disk Array Site Preparation Guide

Site prep tasks

Contact your HP SR for assistance at any time during the site prep process.

1. If you have not printed a copy of this guide, HP recommends that you print at least Chapter 2 and the “Site prep checklist” (page 13). Working from printed copies makes it easier to use the tools provided and provides hard copy documents that you can keep for your records.

2. Carefully review Chapter 2 to understand the site requirements for the disk array. If you plan to connect additional external storage to the XP12000, be sure to take the requirements of that storage into account. See the documentation for the external system.

3. Use the information, instructions, and tools in Chapter 2 to determine site requirements for the specific disk array components you ordered.

4. On the site prep checklist, answer each item “Yes” or “No” as it relates to your site. The checklist includes references to the pages in this guide where you can find more information on each item.

5. Checklist items that require a “Yes” answer are marked with asterisks (*). If you answer “No” for any of these items, your site does not meet site requirements for the disk array. Using the information in Chapter 2, correct the site environment so that you can answer “Yes” for each of these items.

6. When your site meets all site requirements, contact your HP SR to coordinate delivery of the disk array equipment.

7. If you choose to unpack the equipment cartons without HP supervision, follow the instructions in Chapter 3.

8. Contact the HP SR to schedule disk array installation and configuration.

Site prep checklist

Checklist items that require a “Yes” answer are marked with asterisks (*). The customer summary information is included for the benefit of HP representatives, who will help you complete the checklist.

Site Prep Team and Tasks 13

Customer summary

Customer: Date:

Address:

Contact: Phone:

HP summary

HP SR: Phone:

HP representative: Phone:

Safety Yes No Reference

Is there a fire protection system in the computer room? *❑❑page 27

Is the computer room free of any equipment servicing hazards (for example,

*❑❑page 27

electrical or data cables that obstruct access)?

Computer room space planning Yes No Reference

Is the existing floor plan documented? ❑❑page 32 Has a new floor plan been developed to include the new array? *❑❑page 32

Does the new floor plan include adequate space for airflow and servicing

*❑❑page 32

needs?

Does the new floor plan include the clearance required for the floor’s load

*❑❑page 33

rating?

Computer room infrastructure Yes No Reference

Is the computer room structurally complete (walls, floor, air conditioning

*❑❑Chapter 2

system, and so on)?

Is the raised floor adequate for the equipment load? *❑❑page 28 Is antistatic flooring or mats installed? *❑❑page 29 Are there cutouts or channels for cable routing? *❑❑page 29 Is there a dedicated analog telephone line for “phone home” configuration? *❑❑page 52 Is a telephone line available for HP representative use? *❑❑page 52 Is a private LAN available? *❑❑page 52

14 HP StorageWorks XP12000 Disk Array Site Preparation Guide

Computer room environment Yes No Reference

Can the temperature be maintained between 16° and 32° C? *❑❑page 47 Can temperature changes be held to less than 10° C per hour? *❑❑page 47 Can the humidity level be maintained between 20% and 80%? *❑❑page 47

Is the computer room protected against dust, pollution, and metallic

*❑❑page 50

particulate contamination?

Does the computer room support other environmental considerations (such as vibration and acoustics)?

Computer room electrical Yes No Reference

*❑❑page 48–

page 50

Are two AC outlets, on different lines, available for the equipment? *❑❑page 53

Does the input voltage correspond to the DKC and DKU equipment

*❑❑page 53

specifications?

Are the input circuit breakers adequate for equipment loads? *❑❑page 53 Does the input frequency correspond to equipment specifications? *❑❑page 54 Is an appropriate uninterruptible power supply (UPS) strategy in place? *❑❑page 58 If lightning arresters are recommended, are they installed? *❑❑page 59 Have all sources of electrical interferences been corrected? *❑❑page 59

Building access and security Yes No Reference

Does the customer site have access control (for example, HP representatives

❑❑NA

will need an escort)?

Does the computer room have access control (for example, HP

❑❑NA

representatives will need a security code)?

Are all floors, stairs, elevators, stairwalkers, lifts, ramps, or ladders needed

*❑❑page 60

to move the equipment adequate to support its weight and size?

Will the equipment fit through all doors and corridors and in lifts? *❑❑page 60 Does the building have a loading dock? Maximum access height is _____m. ❑❑NA

Additional equipment Yes No Reference

For any additional equipment required (for example, connectors,

*❑❑NA

receptacles, cables, and any equipment not supplied by HP), is the equipment on site and ready for use?

Site Prep Team and Tasks 15

Site prep time allowances

The following site prep tasks may require several weeks:

• Acquiring required power connectors

• Arranging for an electrician

• Adding or modifying air conditioning systems

• Making building alterations

• Placing an order for data comm equipment

The time between placing an equipment order and actual delivery can vary. Contact your HP representative to determine the best estimated delivery dates.

16 HP StorageWorks XP12000 Disk Array Site Preparation Guide

Site Requirements

Your site must meet the following requirements before HP can deliver and install the disk array:

• General computer room requirements, page 25

• Safety requirements, page 27

• Raised floor requirements, page 28

• Space planning requirements, page 32

• Environmental requirements, page 46

• Data comm requirements, page 52

• Electrical requirements, page 53

• Delivery space requirements, page 60

Site Requirements 17

Disk array physical specifications

Mini

Use the information in this section to determine the total dimensions and weight for your specific array configuration. You will need these values to complete other procedures in this chapter.

The disk array includes one disk controller frame (DKC), and zero to four disk array frames (DKUs). The DKC contains the controller electronics for the disk array and some hard disk drives. The DKUs contain additional hard disk drives. Figure 1 shows a disk array with four DKUs.

mum disk subsystem

4th DKU (L2) 3rd DKU (L1) DKC 1st DKU (R1) 2nd DKU (R2)

Figure 1. Disk array minimum/maximum configuration

Supported configurations are:

• One DKC (minimum configuration)

• One DKC and one DKU (R1)

• One DKC and two DKUs (R1 and R2 or R1 and L1)

• One DKC and three DKUs (R1, R2, and L1 or R1, L1, and L2)

• One DKC and four DKUs (maximum configuration)

18 HP StorageWorks XP12000 Disk Array Site Preparation Guide

Dimensions

Use the packaged values when determining delivery space requirements

(page 60), and unpackaged values during space planning (page 32).

Table 2. DKC and DKU dimensions

DKC Unpackaged DKC Packaged DKU Unpackaged DKU Packaged

Dimension

Width 78.2

cm in cm in cm in cm in

30.8 89 35.04 65 25.6 79 31.2

Depth 92.5 36.42 112.5 44.3 92.5 36.42 112.5 44.3

Height 186 73.23 202 79.52 186 73.23 202 79.52

1 Includes two side panels of 1.6 cm (0.63 in.) width each.

Weights

Use the approximate packaged weights when determining delivery space requirements (page 60), and unpackaged weights to calculate the total weight of your configuration (page 22).

Table 3 (page 20) provides the approximate weights for:

• Minimum configuration — base cabinet without additional product components

• Maximum configuration — base cabinet fully populated with product components

Site Requirements 19

Table 3. DKC and DKU weights

Minimum configuration Maximum configuration

Cabinet

kg lb kg lb

Unpackaged 590 1300 875 1930

DKC

Packaged

1, 2

689 1518 989 2180

Unpackaged 429 945 739 1630

DKU

Packaged

1 For shipments from the USA to locations outside the USA and Canada, add 59 kg (130 lb)

for an international shipping crate.

2 Within the USA and Canada, most shipments use a special carrier process in which frames

are shipped without pallets, ramps, and cartons. In these cases, the packaged weight is the unpackaged weight plus 23 kg (50 lb).

3 For upgrade DKU packaging (includes a ramp), add 29 kg (65 lb).

1, 3

499 1100 853 1880

The main factor that increases total weight is the number of disk drives. The actual weight is the base cabinet weight plus the weight of all additional components installed.

Table 4 provides the approximate weights of additional disk array

components when integrated into a DKC or DKU cabinet.

Table 4. Component weights

Product Description kg lb

AE002A #001 Three-phase 30A/60Hz for XP12000 DKC 22.6 50

AE002A #002 Three-phase 30A/50Hz for XP12000 DKC 20 44

AE002A #003 Single-phase 50A/60Hz for XP12000 DKC 21.3 47

AE002A #004 Single-phase 50A/50Hz for XP12000 DKC 17.2 38

AE002A #005 Single-phase 30A/60Hz for standard XP12000 DKC 20 44

AE002A #006 Single-phase 30A/50Hz for standard XP12000 DKC 18.6 41

AE002A #007 Single-phase 30A/60Hz for minimum XP12000 DKC 15.9 35

AE002A #008 Single-phase 30A/50Hz for minimum XP12000 DKC 15 33

AE003A XP12000 SVP High Reliability Support Kit 8.6 19

20 HP StorageWorks XP12000 Disk Array Site Preparation Guide

Table 4. Component weights (continued)

Product Description kg lb

AE004A XP12000 Power Control Interface Kit for Mainframe 0.5 1

AE006A XP12000 16-port 1–2 Gbps FC SW CHIP pair 5 11

AE007A XP12000 32-port 1–2 Gbps FC SW CHIP pair 5.9 13

AE008A XP12000 FC SFP Transceiver LW 0.03 0.05

AE013A XP12000 8-port 1–2 Gbps FICON SW CHIP pair 5.9 13

AE014A XP12000 8-port 1–2 Gbps FICON LW CHIP pair 5.9 13

AE017A XP12000 16-port EXSA CHIP pair 5.4 12

AE018A HP XP12000 8-Port 1 Gbps NAS SW CHIP 6.5 14

AE024A XP12000 DKC Power Supply 23.1 51

AE025A XP12000 4 GB Cache Memory Module 0.2 0.5

AE027A XP12000 Cache Platform Board 6.4 14

AE028A XP12000 DKC-DKU Battery 13.7 30

AE030A XP12000 1 GB Shared Memory Module 0.05 0.1

AE032A XP12000 Shared Memory Platform Board 2.3 5

AE033A XP12000 Cache Switch 3.6 8

AE034A XP12000 Standard Performance ACP pair 5 11

AE040A XP12000 Cable Set for DKU R1, basic 3.2 7

AE041A XP12000 Cable Set for DKU R1, high performance 4.1 9

AE042A XP12000 Cable Set for DKU L1, basic 4.1 9

AE043A XP12000 Cable Set for DKU L1, high performance 4.5 10

AE044A XP12000 Cable Set for DKU R2 or L2 2.3 5

AE045A #001 Three-phase 30A/60Hz for XP12000 DKU 22.6 50

AE045A #002 Three-phase 30A/50Hz for XP12000 DKU 20 44

AE045A #003 Single-phase 50A/60Hz for XP12000 DKU 21.3 47

AE045A #004 Single-phase 50A/50Hz for XP12000 DKU 17.2 38

Site Requirements 21

Table 4. Component weights (continued)

Product Description kg lb

AE045A #005 Single-phase 30A/60Hz for XP12000 DKU 20 44

AE045A #006 Single-phase 30A/50Hz for XP12000 DKU 18.6 41

AE046A XP12000 High Performance FC-AL Disk Path 6.8 15

AE050A XP12000 73 GB 15K rpm Array Group, four disks 4.5 10

AE050AS XP12000 73 GB 15K rpm Spare Disk 1.4 3

AE051A XP12000 146 GB 10K rpm Array Group, four disks 4.1 9

AE051AS XP12000 146 GB 10K rpm Spare Disk 0.9 2

AE053A XP12000 300 GB 10K rpm Array Group 4 9

AE053AS XP12000 300 GB 10K rpm Spare Disk 1 2

Calculating the weight of your disk array configuration

The total weight of your array configuration includes not just the DKC and DKU(s), but also the number of disk drives in each cabinet and any optional components. Your site must have adequate floor strength to support the total weight of the array, from the delivery area to the computer room.

Use the weight calculation worksheet (page 23) to calculate the total weight of your unpackaged array configuration, in your preferred units (kg or lb). See Table 6 (page 24) for an example of a completed worksheet.

Use the calculated total weight to estimate the required floor load rating for the computer room (page 28).

22 HP StorageWorks XP12000 Disk Array Site Preparation Guide

Table 5. Weight calculation worksheet

Units (kg or lb)

Part Number Description Weight1Quantity

Extended

weight

Total weight of your configuration

1From Table3 (page 20) or Table 4 (page 20).

Site Requirements 23

Weight calculation example

Table 6. Weight calculation worksheet example

Units (kg or lb)

Part Number Description Weight

Pounds (lb)

Quantity

Extended

weight

AE002A XP12000 Disk Control Frame (DKC) 1300 x 1 = 1300

AE002A #001 Three-phase 30A/60Hz for XP12000 DKC 50 x 1 = 50

AE007A XP12000 32-port 1–2 Gbps FC SW CHIP pair 13 x 2 = 26

AE013A XP12000 8-port 1–2 Gbps FICON SW CHIP pair 13 x 1 = 13

AE024A XP12000 DKC Power Supply 51 x 1 = 51

AE025A XP12000 4 GB Cache Memory Module 0.5 x 8 = 4

AE028A XP12000 DKC-DKU Battery 30 x 4 = 120

AE030A XP12000 1 GB Shared Memory Module 0.1 x 3 = 0.3

AE033A XP12000 Cache Switch 8 x 1 = 8

AE034A XP12000 Standard Performance ACP pair 11 x 2 = 22

AE040A XP12000 Cable Set for DKU R1, basic 7 x 1 = 7

AE041A XP12000 Cable Set for DKU R1, high performance 9 x 1 = 9

AE045A XP12000 Disk Array Frame (DKU) 945 x 1 = 945

AE045A #001 Three-phase 30A/60Hz for XP12000 DKU 50 x 1 = 50

AE046A XP12000 High Performance FC-AL Disk Path 15 x 1 = 15

AE051A XP12000 146 GB 10K rpm Array Group, four disks 9 x 70 = 630

AE051AS XP12000 146 GB 10K rpm Spare Disk 2 x 4 = 8

Total unpackaged weight of your configuration

1From Table3 (page 20) or Table 4 (page 20).

24 HP StorageWorks XP12000 Disk Array Site Preparation Guide

3258.3

General computer room requirements

The goal of a computer room is to maintain an ideal environment for computer equipment, including XP disk arrays.

Make sure your computer room adheres to all national and local building codes for a data center/computer room environment.

HP recommends that you follow these general guidelines:

• Locate the computer room away from exterior walls of the building to avoid the heat gain from windows and exterior wall surfaces.

• When exterior windows are unavoidable, use windows that are double or tripled glazed and shaded to prevent direct sunlight from entering the computer room.

• Maintain the computer room at a positive pressure relative to the surrounding spaces to reduce introduction of contaminants.

• Install a vapor barrier around the entire computer room envelope (floors/walls/ceiling) to help keep moisture out of the room. This is especially important if your computer room is located underground.

• Caulk and vapor-seal all pipes and cables that penetrate the computer room envelope.

Preventing electrostatic discharge

Electrostatic discharge (ESD) can cause component damage during servicing operations.

Static charges occur when objects are separated or rubbed together. The voltage level of a static charge is determined by the following factors:

• Types of materials

• Relative humidity — low humidity contributes to undesirably high levels of electrostatic charges, which increases the ESD voltage potential.

Site Requirements 25

• Rate of change — a standard air conditioner both cools and removes moisture from the air. The rate of change is how quickly the air in the room is dried. The drier the air, the more static is generated. If you do not use proper cooling equipment, air dryness can present problems.

• Separation — refers to the static discharge that can be generated when two objects are separated. For example, printer paper is often stored in cool dry conditions. If opened and used immediately, the act of removing the paper from its box generates static. To allow the static to discharge gradually over time, leave the box open in the computer room for several hours before use.

Follow these precautions to minimize possible ESD-induced failures in your computer room:

• Install conductive flooring (conductive adhesive must be used when laying tiles).

• Use conductive wax if waxed floors are installed.

• Ensure that all equipment and flooring are properly grounded and are at the same ground potential.

• Use conductive tables and chairs.

• Store spare electric parts in antistatic containers.

• Maintain recommended humidity level and airflow rates.

26 HP StorageWorks XP12000 Disk Array Site Preparation Guide

Safety requirements

When making decisions concerning site safety, your first concern should be the safety of your personnel and then the safety of your equipment.

Fundamental safeguards for disk arrays should include a site well away from any sources of potential damage.

If you have any questions on site safety, consult your HP representative, your insurance carrier, and local building inspectors for safety recommendations.

Fire safety

Do not install or operate the disk array in an environment where there is a risk of fire or explosion due to the presence of highly flammable gases, volatile liquids, or combustible dust.

Consult your insurance carrier and local fire department for fire safety suggestions. They can analyze your existing fire control systems and advise you on any required changes. If you are building a new site or making structural changes to an existing site, consult your local building codes for fire prevention and protection guidelines.

Equipment servicing hazards

Your staff and HP service personnel require safe access to the disk array. Running electrical and data communication cables underneath your computer room’s raised floor is the best way to ensure that they do not create a safety hazard.

Site Requirements 27

Raised floor requirements

The computer room floor must be able to support the total weight of the equipment as well as localized weight at each caster or foot of the equipment cabinets. A common method of preparing an adequate floor for a computer room is to construct a raised floor over the building floor. A raised floor:

• Allows weight to be spread evenly across the floor

• Provides an under-floor area for running interconnecting cables conveniently and unobtrusively

• Allows optimum distribution of conditioned air

Warning

If metal is used in the construction of the raised floor, ensure that there is a common ground connection between the raised floor and main floor to avoid possible build up of different voltage potentials. Failure to comply can result in serious injury to personnel and damage to equipment.

Requirements for raised floors:

• Raised floor access ramps must not exceed a 10

• Use a 10- to 12-inch raised floor system for the most favorable room air distribution system.

• Grid panels must be at least 45 x 45 cm (17.72 x 17.72 in).

• The floor must have a load rating between 300 and 500 kg per square meter (553 to 921.7 lb per square yard, or 61.4 to 102.4 lb per square foot). The maximum point floor loading is 500 kg (1102.3 lb).

To estimate the load rating you need for your floor, consider the total weight of all of these items:

• The disk array; see “Weights” (page 19)

• Other equipment

28 HP StorageWorks XP12000 Disk Array Site Preparation Guide

° slope.

Floor covering

Caution HP strongly discourages the use of carpeting, including antistatic varieties,

Caution If your computer room has carpeting, place static discharge mats where

• Furniture such as desks, chairs, and storage cabinets

• Computer room personnel

• Moving equipment such as forklifts, dollies, and similar items

The lower the floor load rating, the more clearance is required around the array to distribute the equipment weight correctly. If your computer room is too small to allow for minimum required clearance around the array, you may need to increase the floor load rating. For more on required clearance, see “Floor clearance” (page 33).

HP recommends the use of a tiled raised floor.

within 6.0 m (20 ft.) of the disk array. Over time, carpeting may shed dust that can cause problems with the disk array.

personnel must walk across them before touching any part of the array. Failure to comply with this precaution can result in equipment damage through static discharge.

Floor cutouts

Figure 2 (page 30) and Figure 3 (page 31) show the locations of floor cutouts under the DKC and DKU. Basically, position floor cutouts toward the center of the cabinet. The position may be off-center as long as the cutout is within the allowable range and allows smooth entrance of an external cable (check the relationship between the position of the cutout and the opening on the bottom of the cabinet).

Site Requirements 29

DKC floor cutouts

Figure 2. DKC floor cutouts

30 HP StorageWorks XP12000 Disk Array Site Preparation Guide

+ 68 hidden pages