Dell PowerVault 220S User Manual

Dell PowerVault 220S and 221S Systems Service Manual

Dell™ PowerVault™ 220S and 221S Systems Service
Manual

Preface
System Overview
Basic Troubleshooting
Removing and Replacing Parts

Information in this document is subject to change without notice.
© 2001-2004 Dell Computer Corporation. All rights reserved.

Reproduction in any manner whatsoever without the written permission of Dell Computer Corporation is strictly forbidden.
Trademarks used in this text: Dell, the DELL logo, PowerVault, and Dell OpenManage are trademarks of Dell Computer Corporation; IBM is a

registered trademark of International Business Machines Corporation.
Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products.

Dell Computer Corporation disclaims any proprietary interest in trademarks and trade names other than its own.

Initial release: 17 Sep 2001
Last revised: 25 Oct 2004

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Preface : Dell PowerVault 220S and 221S Systems Service Manual

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Preface

Dell™ PowerVault™ 220S and 221S Systems Service Manual

Read This First Notes, Notices, and Cautions

Read This First

Prerequisites for using this manual to service your system is a basic knowledge of IBM®-compatible PCs, prior training in IBM-compatible PC
troubleshooting techniques, and experience troubleshooting SCSI storage enclosures. In addition to this manual and the User's Guide that came
with your system, the Installation and Troubleshooting Guide provides installation and configuration information, including cabling diagrams and
setup procedures. Your array management software documentation provides information on configuring and managing your storage system.

This manual is divided into the following sections:

"System Overview" — Overview of the system's features, components, and technical specifications
"Basic Troubleshooting" — Initial checks and procedures used to solve basic system problems
"Removing and Replacing Parts" — Removal and replacement of all field-replaceable parts, including power supplies, cooling modules,

enclosure management modules (EMM), split-bus modules, and the SCSI backplane

Notes, Notices, and Cautions

Throughout this manual, there may be blocks of text printed in bold type or in italic type. These blocks are notes, notices, and cautions, and
they are used as follows:

NOTE: A NOTE indicates important information that helps you make better use of your computer.
NOTICE: A NOTICE indicates either potential damage to hardware or loss of data and tells you how to avoid the problem.

CAUTION: A CAUTION indicates a potential for property damage, personal injury, or death.

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System Overview : Dell PowerVault 220S and 221S Systems Service Manual

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System Overview

Dell™ PowerVault™ 220S and 221S Systems Service Manual

Overview Components and Indicators
System Features Technical Specifications
Service Features

Overview

Dell™ PowerVault™ 220S and 221S systems are reliable, flexible, external SCSI expansion enclosures designed to support multiple Dell storage environments and RAID configurations.
Each system offers maximized drive-spindle count, hot-plug hard drives, optional redundant power supplies, redundant cooling modules, rackmount capability, systems management
features, and a modular design for easy upgrades. Most major components, including hard drives and power supply/cooling modules are hot-pluggable and can be removed and replaced
easily. The enclosure management module (EMM), split-bus module, and SCSI terminator card are "warm-pluggable." This means they can be removed or inserted while the power is
on, but all I/O activity has ceased.

This section provides an overview of system features and components, and technical specifications.

System Features

Your system offers the following features:

Tower or rack versions (3 units [U] [19 inches]).
Capacity for fourteen 1-inch hot-plug SCSI hard drives. (See "Technical Specifications" or your system's readme file for supported hard-drive speeds and capacities.)
Universal hard-drive carriers.
Support for a variety of RAID controller cards, host-integrated RAID controllers, and host bus adapter (HBA) cards. (See your system's readme file for supported RAID controllers

and HBA cards.)
Hot-plug power supply and cooling modules that are combined for easy serviceability. The cooling modules are redundant. Power supply modules can be redundant or

nonredundant.
Optional redundant enclosure management modules (EMM).
Support for the following direct-attach configurations:

High-availability redundant EMM configuration in joined-bus mode (with a terminator card for nonredundant configurations).
High-availability cluster configurations (with redundant EMMs) that allow multiple-server access to the same enclosure.

Split-bus module (with redundant EMMs) to operate the enclosure using two separate buses.
Enclosure management through in-band SCSI enclosure services (SES) for power supplies and cooling modules and SCSI-accessed fault-tolerant enclosures (SAFTE).
Storage management through Dell OpenManage™ Array Manager.
Four sensors for monitoring ambient temperatures and shutdown capability when temperatures reach a critical level.
Audible warning for critical component failure.
Supported for all new Dell servers. (See your system's readme file for supported systems.)

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System Overview : Dell PowerVault 220S and 221S Systems Service Manual

Service Features

Your storage system was designed for easy serviceability. All hard drives, power supplies, cooling modules, EMMs/SCSI terminator cards, and split-bus modules can be removed and
replaced without having to remove system covers or other components.

Components and Indicators

Front-Panel Components and Indicators

Figure 1 shows the front-view orientation of both systems.

Figure 1. System Orientation

1 PowerVault 220S
2 PowerVault 221S

Figure 2 illustrates LED indicators and components on the system's front panel. Table 1 lists conditions indicated by each LED.

Figure 2. Front-Panel Features

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1 drive busy LED indicator
2 drive status LED indicator
3 hard drives (14)
4 over-temperature LED indicator
5 split-bus LED indicator
6 cluster LED indicator
7 shelf-fault LED indicator
8 power LED indicator

System Overview : Dell PowerVault 220S and 221S Systems Service Manual

Table 1. Front Panel Indicators

LED Indicator LED Icon Condition

Power (green)
Shelf-fault

(amber)
Cluster (green)

Split-bus
(green)

Over­temperature
(amber)

Hard-Drive Carrier LED Indicators

Each of your storage system's 14 hard-drive carriers has two LED indicators: a busy indicator and a status indicator (see Figure 2 for location). Table 2 shows the hard-drive LED
indicators with the associated LED icons.

Table 2. Hard-Drive Carrier LED Indicators

LED Indicator LED Icon Condition

Busy (green)

Status (green and amber)

Table 3. Hard-Drive Carrier Status Indicator Flash Patterns

Condition Status Indicator Pattern

Slot empty, ready for insert/remove Off
Drive online, prepare for operation Steady green
Drive identify Flashes green four times per second
Prepare for removal Flashes green twice per second at equal intervals
Drive rebuild Flashes green twice per second at unequal intervals
Drive fail Flashes amber four times per second
Predicted failure Flashes green, then amber, then off, repeating this sequence every two seconds

At least one power supply is supplying power to the system.
One of the following conditions has occurred: power-supply failure, EMM failure, cooling-module failure, over-temperature condition, split-bus module not

installed, or firmware currently being downloaded. For more information, see "
The system is configured for cluster mode. For more information, see "Split-Bus Module."

The system is configured for split-bus mode. For more information, see "Split-Bus Module."

An over-temperature condition has occurred (the system will shut down when the temperature inside the box exceeds 50°C [122°F]). For more
information, see "

Basic Troubleshooting." For the locations of the temperature probes, see "Temperature Probes."

Table 3 lists the flash patterns for the hard-drive status indicator.

The hard drive is active on the SCSI bus.NOTE: This LED is controlled by the hard drive.

See Table 3 for flash patterns and conditions.

Basic Troubleshooting."

Back-Panel Features and Indicators

Figure 3 illustrates the back-panel features for systems with redundant EMMs and redundant power supplies. Figure 4 illustrates the back-panel features for nonredundant systems. See
Figure 5, Figure 6, and Figure 8 for more detail on the back-panel indicators.

Figure 3. Back-Panel Features (Systems With Redundant EMMs and Redundant Power Supplies)

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1 unused port
2 cooling module (blowers 2 and 3)
3 power supply (PSU1)
4 power supply (PSU2)
5 cooling module (blowers 0 and 1)
6 unused port

System Overview : Dell PowerVault 220S and 221S Systems Service Manual

Figure 4. Back-Panel Features (Systems With Nonredundant EMMs and Nonredundant Power Supplies)

7 primary EMM
8 split-bus module
9 secondary EMM

1 SCSI terminator card
2 cooling module (blowers 2 and 3)
3 power-supply blank
4 power supply
5 cooling module (blowers 0 and 1)
6 unused port
7 EMM
8 split-bus module

Back-Panel Modules

Figure 5 illustrates the features and indicators on the back-panel modules. See Figure 6 for more information about bus configuration switch modes.

Figure 5. Back-Panel Modules Features and Indicators

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1 bus configuration switch
2 power LED indicator
3 SCSI connector
4 active LED indicator
5 fault LED indicator
6 power LED indicator

System Overview : Dell PowerVault 220S and 221S Systems Service Manual

Split-Bus Module

Your storage system supports three SCSI bus modes controlled by the split-bus module:

Joined-bus mode
Split-bus mode
Cluster mode

These modes are controlled by the position of the bus configuration switch when the system is turned on.
configuring the SCSI bus modes, see your Installation and Troubleshooting Guide.

Figure 6. Bus Configuration Switch Modes

Figure 6 illustrates the switch position for each mode. For more information on

1 joined-bus mode (top position for rack systems, right for tower systems)
2 split-bus mode (center position for rack and tower systems)
3 cluster mode (bottom position for rack systems, left for tower systems)

The only difference between cluster mode and joined-bus mode is the SCSI ID assigned to the enclosure services processor on the EMM. When cluster mode is detected, the processor
SCSI ID changes from 6 to 15. As a result, SCSI ID 15 is disabled, leaving 13 available hard drives in cluster mode. This allows a second initiator, such as a host bus adapter or RAID
controller card on a second host server, to use SCSI ID 6 (see

Table 4. SCSI ID Assignments

Configuration

Joined-bus 1 H S
Split-bus—primary EMM 1 H S
Split-bus—secondary EMM 1 H S
Cluster 2 S H H

NOTE: The unshaded SCSI IDs are available for hard-drive use as indicated for each configuration. The reserved SCSI IDs are used as follows:

H = used by the host system initiator.
S = used by the storage system SES.

Cables Used SCSI IDs Used

Figure 7. SCSI ID Numbers and Associated Hard Drives

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Table 4 for SCSI ID assignments and Figure 7 for associated hard drives).

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

System Overview : Dell PowerVault 220S and 221S Systems Service Manual

See Table 5 for a description of split-bus module modes and functions.

NOTE: To change the SCSI bus mode, you must change the position of the bus configuration switch before turning on the storage system. Changing the position of the bus

configuration switch while the system is on will not affect system operation. If you change the configuration, you must first reboot the host system and then the server storage
system for the changes to take effect. For more information on SCSI bus modes, see your Installation and Troubleshooting Guide.

Table 5. Split-Bus Module Modes

Mode LED Icon Position of Bus

Joined­bus
mode

Split­bus
mode

Cluster
mode

Configuration Switch

Top for rack systems,
right for tower systems

Center for all systems LVD termination on the split-bus module is enabled and the two buses are electrically isolated, resulting in two seven-drive SCSI buses.

Bottom for rack

systems, left for tower
systems

Function

LVD termination on the split-bus module is disabled, electrically joining the two SCSI buses to form one contiguous bus. In this mode,
neither the split-bus nor the cluster LED indicators on the front of the system (see

The split-bus LED indicator on the front of the system (see

LVD termination is disabled and the buses are electrically joined. The cluster LED on the front of the system (see
illuminated while the system is in cluster mode.

Figure 2 for locations) are illuminated.

Figure 2 for location) is illuminated while the system is in split-bus mode.

Figure 2 for location) is

The split-bus module has only one LED indicator (see

Figure 5 for LED location), which is illuminated when the module is receiving power.

Enclosure Management Module (EMM)

The EMM serves two primary functions in your storage system:

SCSI bus expansion — Acts as a buffer for the SCSI bus, electrically dividing the bus into two independent segments while logically allowing all SCSI bus traffic to pass through it
transparently. The buffer improves the quality of the SCSI signals and allows longer cable connections.

Management functions — Includes SES and SAFTE reporting to the host system, control of all system LED indicators, and monitoring of all environmental elements, such as
temperature sensors, cooling modules, and power supplies.

A system with redundant enclosure management features has two EMMs that are designated as primary and secondary that can be configured in either a cluster or joined-bus mode. A
system with nonredundant enclosure management has one EMM and one SCSI terminator card configured in a joined-bus mode or two EMMs configured in a split-bus mode. In
redundant EMM systems, only one EMM per SCSI bus is active at one time, so only one EMM per SCSI bus can respond to SCSI commands from an initiator.

In joined-bus and cluster modes, if a secondary EMM receives a message that the primary EMM has failed, the fault LED indicator on the primary EMM is illuminated and the condition is
reported to the host server. The secondary EMM becomes active and holds the failed primary in a reset state until it is replaced. If the primary EMM detects that the secondary has
failed, the secondary's fault LED indicator is illuminated and the failed status is reported to the host system.

NOTE: In split-bus mode, although each EMM monitors the entire storage system, it controls only half of the hard-drive slots. If one EMM fails in split-bus mode, the second EMM

will report the failure, but will not assume control of the hard-drive slots that were previously controlled by the failed EMM.

NOTE: The EMM is "warm-pluggable." This means it can be removed or inserted while the power is on. However, all I/O activity between the host and the storage system must be

stopped.

The primary EMM is always plugged into the slot on the left (viewed from the back of the system). In systems with redundant EMMs configured for joined-bus mode, the primary EMM
assumes control of all the system's functionality. In addition, the active EMM is the only module that reports status of the system to the host system through SES and SAFTE protocols.
Because the secondary EMM must assume the responsibilities of the primary in the event that the primary fails, both the primary and secondary EMMs are continuously monitoring the
status of the system's components.

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System Overview : Dell PowerVault 220S and 221S Systems Service Manual

Table 6 lists the conditions for each EMM LED indicator. See Figure 5 for location of the LED indicators.

8 cooling module

Table 6. EMM LED Indicators

LED Indicator LED Icon Condition

Power (green)
Fault (amber)

Active (green)

The system is receiving power.
An EMM has failed.

The EMM is operating normally and performing all the responsibilities of the primary EMM.

Temperature Probes

Your storage system contains four temperature probes that monitor system temperature and shut down the system in the event of overheating. Each EMM and both the primary and
secondary backplanes contain temperature probes.

Table 7. Temperature Probe Locations

Probe Location

Probe 0 Primary EMM
Probe 1 Secondary EMM
Probe 2 Drive backplane behind drive ID #3
Probe 3 Drive backplane behind drive ID #12

Table 7 identifies the location of each probe.

Power Supply/Cooling Modules

Your storage system supports two combined power supply and cooling modules. While the system is designed to operate normally with only one functional power supply, both cooling
modules (each with two blowers) must be present for proper cooling. If only one power supply is needed, a blank must be inserted into the other slot to mount the second cooling
module. In this nonredundant power-supply configuration, the power-supply blank has the capacity to transfer power and control signals to and from the cooling module.

If one blower within a cooling module fails, your storage system reverts to a nonredundant fan configuration. The remaining three blowers in both cooling modules operate at higher
speeds to maintain proper system cooling and produce higher acoustical noise than in the redundant fan configuration (with four blowers in two cooling modules).

CAUTION: A power supply and cooling module can be removed from a powered-on system for a maximum period of five minutes. Beyond that time, the system

begins to overheat, and at a critical temperature, shuts down to prevent damage.

The cooling module is securely mounted to the power supply using a hook-and-latch fastener. This configuration simplifies the removal and installation of cooling modules and power
supplies.

Figure 8 illustrates the power supply and cooling module features and LED indicators. Table 8 lists the function of each power supply and cooling module indicator.

Figure 8. Power Supply and Cooling Module LED Features and Indicators

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1 blower A fault LED indicator
2 blower B fault LED indicator
3 on/off switch
4 AC connector
5 AC status LED indicator
6 fault LED indicator
7 power-on LED indicator

System Overview : Dell PowerVault 220S and 221S Systems Service Manual

Table 8. Power Supply and Cooling Module LED Indicators

Module Icon LED Indicator LED Icon Function

Power on (green) DC output voltages are within specifications.

Power supply

Cooling module

Fault (amber) One of the DC output voltages is not within specifications.
AC status (green)

Blower A fault (amber) Cooling module blower A has failed.
Blower B fault (amber)

AC input voltage is within specifications regardless of the position of the power switch.

Cooling module blower B has failed.

Audible Alarm

The primary EMM activates an audible alarm if any of the shelf-fault conditions listed in Table 1 occur. If a critical event occurs, the alarm sounds continuously. If a noncritical event
occurs, the alarm sounds every 10 seconds.

NOTE: The audible alarm is disabled by default. To enable the alarm, you must change the default setting using your array management software. For more information, see your

array management software documentation.

NOTE: When the system is on and a split-bus module is not detected, the audible alarm will sound regardless of whether it is enabled or disabled.

Table 9. Audible Alarm Critical and Noncritical Events

Critical Events Noncritical Events

Two or more cooling-module blowers have failed or a cooling module is not installed. One power supply has failed.

One or more temperature sensors are in critical range (in excess of 50°C [122°F] inside
the box).

The split-bus module is not installed.

NOTE: It is rare for both EMMs to fail simultaneously. However, if this event occurs, the system cannot issue critical or noncritical event alarms for any system component. If both

power supplies fail simultaneously, the system can issue critical or noncritical event alarms only if 5-V power is available.

Table 9 lists critical and noncritical events.

One cooling-module blower has failed.

One or more temperature sensors are in the warning range.
One EMM has failed.

Technical Specifications

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