Dell EqualLogic PS4110 User Manual

PS4110 Storage Arrays

HardwareOwner's Manual

Version 1.0

Copyright 2011-2013 Dell Inc. All rights reserved.

Dell and EqualLogic are trademarks of Dell Inc.

All trademarks and registered trademarks mentioned herein are the property of their respective owners. Information in this document is subject to change without notice.

Reproduction in any manner whatsoever without the written permission of Dell is strictly forbidden.

Published February 2013

Part Number: 110-6067-EN-R2

Table of Contents

1	Basic Storage Array Information	1
	Notes, Cautions, and Warnings	1
	Recommended Tools	1
	Chassis Types	2
	Array Features	2
	Back-Panel Features and Indicators	5
	Shutting Down and Restarting an Array	5
2	Maintaining Drives	7
	About Drive Types	7
	Identifying Failed Drives	7
	Interpreting Drive LEDs	8
	Array Behavior When a Drive Fails	9
	Drive Handling Requirements	9
	Drive Installation Guidelines and Restrictions	10
3	Maintaining Control Modules	17
	Control Module Features	17
	Replacing a Control Module	24
	Replacing the MicroSD Card	29
	Advanced Networking Options	31
4	Maintaining Power Supply and Cooling Modules	33
	About Power Supplies	33
	Identifying Power Supply Failures	33
	Removing a Power Supply and Cooling Module	35
	Installing a Power Supply and Cooling Module	36
5	Troubleshooting Your Array	39
	Safety First—For You and Your array	39
	Obtaining Technical Support and Customer Service	39
	Determining Service Tag Information	40
	Obtaining Component Diagnostics	40
	Troubleshooting Array Startup Failure	40
	Troubleshooting Loss of Communication	40
	Troubleshooting Array Connections	40
	Troubleshooting External Connections	41
	Troubleshooting Power Supply and Cooling Modules	41
	Troubleshooting Array Cooling Problems	41
	Troubleshooting Control Modules	42
	Troubleshooting Hard Drives	42
Index		43

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1 Basic Storage Array Information

This chapter includes information about the location and basic operation of the replaceable components in a storage array, tools and equipment you will need, protecting hardware from electrostatic discharge, and power on and off operations.

Notes, Cautions, and Warnings

A NOTE indicates important information that helps you make better use of your system.

A CAUTION indicates potential damage to hardware or loss of data if instructions are not followed.

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

Recommended Tools

You will need the following items to perform the procedures in this section:

•Bezel key

•Wrist grounding strap

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Protecting Hardware

Protect a PS Series array from electrostatic discharge. When handling array hardware, make sure you use an electrostatic wrist strap or a similar form of protection. To use a wrist strap:

1. Connect the steel snap on the coil cord to the stud on the elastic band. See Figure 1.

Figure 1: Using an Electrostatic Wrist Strap

2.Fit the band closely around your wrist.

3.Connect the band to ground. You can either plug the banana connector into a matching grounded receptacle, or attach it to the matching alligator clip and connect the clip to a grounded device. Examples of an appropriate ground would be an ESD mat or the metal frame of a grounded piece of equipment.

Chassis Types

The PS4110 array is available in two different chassis types:

•A 2U chassis with 24 2.5-inch drives, installed vertically

•A 2U chassis with 12 3.5-inch drives, installed horizontally

Array Features

The array has LEDs and other features on both the front and the back.

The Bezel

The bezel is an optional trim panel that attaches to the front of the array to ensure the physical security of the array. You must remove the bezel to access and maintain the drives.

The bezel has a label that identifies the array model number.

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Removing the Bezel

The steps for removing the bezel are the same for all array models.

1.Using the bezel key, unlock the bezel.

2.Holding the bezel, lift the latch on the left side of the bezel and swing the left side away from the array.

3.Lift the right side of the bezel off the right side of the array.

4.Set the bezel aside.

Installing the Bezel

The steps for installing the bezel are the same for all the array models.

1.Hook the right end of the bezel onto the right side of the chassis.

2.Swing the left end of the bezel towards the left side of the chassis.

3.Press the bezel into place until the release latch closes.

4.Using the key provided, lock the bezel and store the key in a safe place.

Figure 2: Installing the Bezel

Front-Panel Features and Indicators

The front of a PS4110, without the bezel, is shown in Figure 3 and Figure 4.

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Table 1 describes the front panel features.

Figure 3: Front Panel Features and Indicators (3.5-inch Drives)

Figure 4: Front Panel Features and Indicators (2.5-inch Drives)

Table 1: Front Panel Feature Descriptions

Item Indicator

Icon

Description

The array status LED lights when the array power is on.

		•	Off—No power.
		• Steady blue—Array status is OK.
1	Array status	•	Slow blinking blue—Array status is Standby mode.
	LED	•	Blinking blue—Administrator request to identify the array (see the Group
			Manager online help).
		•	Steady amber—Critical status.
		•	Blinking amber—Warning.

The power LED is ON when at least one power supply is supplying power to the array.

2 Power LED

• Off—No power, or the array is in Standby mode.

•Steady green—Array has at least one power supply providing power, and array is not in Standby mode.

3	Drive Release	None Enables you to remove a drive from the array.
	Latch

Note: The LEDs are part of a built-in chassis control panel that is not hot-swappable and can be replaced only by support personnel. During the array power-up sequence, these LEDs will cycle through different states until the array is fully started and the active control module has been determined.

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Back-Panel Features and Indicators

The back of a PS4110 is shown in Figure 5.

Table 2 describes the back panel features.

Figure 5: Back Panel-Features

Table 2: Array Back Panel Features

	Item	Feature	Identifier
	1	Power switch	None
	2	Power supply unit	PSU0 (left)
		(PSU)	PSU1 (right)
	3	Control Module	CM0 (top)
			CM1 (bottom)
	4	Control Module	None
		Release Lever

Description

The power switch controls the power supply output to the array. One on each power supply.

Power supply and cooling fan module for array.

For more information, see Power Supply LEDs on page 33.

The control module provides:

•a data path between the array and the applications using the storage

•array management functions for your array

Enables you to remove the control module from the array.

Shutting Down and Restarting an Array

A PS Series array includes redundant, hot-swappable drives, power supplies, and control modules (in a dual control module array). You can remove a redundant component without affecting operation if a functioning component is available. Otherwise, it is recommended that you cleanly shut down the array and turn off power before removing a component.

Note: When an array is shut down, any volumes with data on the array will be set offline until the array is successfully restarted. This may affect initiators that are connected to the volumes.

1. Do one of the following:

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•Use telnet or SSH to connect to a functioning IP address assigned to a network interface on the array. Do not connect to the group IP address.

•Use the null modem cable shipped with the array to connect to the serial port on the active control module (ACT LED is green) to a console or a computer running a terminal emulator.

Make sure the serial line characteristics are as follows:

•9600 baud

•One STOP bit

•No parity

•8 data bits

•No flow control

2.Log in to an account with read-write access, such as the grpadmin account.

3.Enter the shutdown command, as shown next.

login: grpadmin

Password:

Welcome to Group Manager

Copyright 2001-2011 Dell, Inc.

group1> shutdown

If you are using a serial connection to shut down an array, it is safe to turn off power when the “press any key” message appears. (Pressing any key will restart both control modules.)

If you are using a network connection, the session will be disconnected before the array is fully shut down. Confirm that the ACT LED on each control module is off (not lit) before turning off power to the array.

After performing array maintenance, you can turn on power to the array. When the array restart completes, the member and volumes will be set online.

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2 Maintaining Drives

You can replace a failed drive while the array remains running.

About Drive Types

Depending on your configuration, your array supports up to 24 2.5-inch SAS drives or up to 12 3.5-inch SAS drives in internal drive bays.

Drives are connected to a backplane through drive carriers and are hot-swappable.

Drives are supplied in a carrier that is keyed to fit into specific array models, and cannot be installed in other Dell arrays, or arrays not from Dell Inc.

Identifying Failed Drives

A drive failure is indicated by:

•LEDs on the drive. See Interpreting Drive LEDs on page 8.

•A message on the console, in the event log, or in the Group Manager Alarms panel.

•Indications in the Group Manager Member Disks window or the CLI member select show disks command output.

Behind the bezel, arrays have a label showing the drive numbering for that specific array model:

•In arrays with 2.5-inch drives (installed vertically in a row), the drives are numbered 0-23, left to right.

•In arrays with 3.5-inch drives (installed horizontally), the drives are numbered from left to right and top to bottom, starting with 0 on the upper left side. Table 3 shows the drive order for the 3.5-inch drives.

Table 3: 3.5-inch Drive Numbering

3.5-inch Drive Numbering

0	1	2	3
4	5	6	7
8	9	10	11

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Interpreting Drive LEDs

The LEDs on a 3.5-inch drive are shown in Figure 6. The LEDs on a 2.5-inch drive are shown in Figure 7. Drive LED states are described in Table 4.

Figure 6: LEDs on 3.5-inch Drives

Figure 7: LEDs on 2.5-inch Drives

		Table 4: Drive LED States
	Description	Indicator States
	Drive activity indicator (ACT LED)	Blinking green: Drive is busy
		Steady green: No drive activity
		Green: Drive OK
	Drive status indicator (PWR LED)	Amber: Drive failed
		Off: No power to drive

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Array Behavior When a Drive Fails

How an array handles a drive failure depends on whether a spare drive is available and whether the RAID set containing the failed drive is degraded.

For example:

•If a spare drive is available, the array automatically uses it to replace the failed drive. Performance is normal after reconstruction completes.

•If a spare drive is not available the RAID set will become degraded (except a RAID 6 set). Performance may be impaired. A RAID 6 set can survive two simultaneous drive failures.

•If a spare drive is not available and the failed drive is in a RAID set that is already degraded, data may be lost and must be recovered from a backup.

•If a drive fails, replace it. Do not re-install it in the array.

Drive Handling Requirements

Handle drives as follows:

•Store drives properly. Store replacement drives in the packaging in which they were shipped. Do not stack drives or place anything on top of a drive.

•Protect drives from electrostatic discharge. Wear an electrostatic wrist strap when handling a drive, unless it is protected from electrostatic discharge. See "Protecting Hardware " on page 2.

•Handle drives carefully. Hold a drive only by the plastic part of the carrier or the handle. Do not drop or jolt a drive or force a drive into a slot.

•Warm replacement drives to room temperature before installation. For example, let a drive sit overnight before installing it in an array.

•Do not leave drive slots empty. Each drive slot in an array must contain a drive assembly or a blank carrier. Operating an array with an empty slot will void your warranty and support contract.

•Do not remove a functioning drive (other than a spare) from an array. If the drive is not a spare, the RAID set may become degraded. If you remove a spare, replace the drive as soon as possible.

•Do not remove a drive from its carrier. This action will void your warranty and support contract.

•Keep the shipping material. Return a failed drive to your array support provider in the packaging in which the replacement drive was shipped. Shipping drives in unauthorized packaging may void your warranty.

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Drive Installation Guidelines and Restrictions

•Replace a failed drive as soon as possible to provide the highest availability.

•Install only drives of the same type, speed, and spin rate in an array.

•Make sure the drive is oriented in the correct position for the array model. See Front-Panel Features and Indicators on page 3.

•You can use drives of different capacities in the same array. However, the smallest drive in the array will determine how much space can be used on each drive. For example, if the smallest drive is 400GB, only 400GB of space will be available for use on each drive.

•Make sure to insert a drive fully in the chassis before pushing in the handle.

•When correctly installed, a drive will be flush with the front of the array. If the drive is protruding from the array, reinstall the drive.

•After installation, make sure the drive power LED is green or flashing green. See Identifying Failed Drives on page 7.

•There is a two-minute delay between the time you insert a drive and the time the drive is automatically configured into a RAID set. This time interval allows multiple drives to be simultaneously configured in an array, which is more efficient than installing a single drive, configuring it, and then repeating the process. For example, when you install a drive, the timer starts. If no other drives are installed, the drive is configured after a delay of two minutes. If you install another drive before two minutes have elapsed, the timer is restarted.

•If you install a drive during RAID reconstruction or verification, the new drive will not be configured until the operation completes.

Removing a 2.5-inch Drive

1.Remove the bezel. See Removing the Bezel on page 3.

2.Press the release button (callout 1 in Figure 8). The drive latch opens and the drive emerges partway from the array (callout 2).

3.Pull the drive out by the handle until it is free of the drive bay (callout 3).

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Figure 8: Removing a 2.5-Inch Drive

Installing a 2.5-inch Drive

The 2.5-inch drives are installed vertically, with the drive release latch on the top and the drive label on the bottom.

1.Wear electrostatic protection when handling a drive. See "Protecting Hardware " on page 2.

2.Open the drive release latch.

3.Hold the drive by the carrier and slide the drive most of the way into a slot (callout 1 in Figure 9).

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