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Replacing a Hard Disk Drive

This document is for system administrators who have access to both the search appliance hardware and the search appliance administrative software.

Use this document to diagnose and replace a failed hard disk drive in Google Search Appliance models G100, G500:

Note: The hard disk drives in the G100 are replaceable if the Appliance ID starts with T4, or T5. View the Appliance ID from the Admin Console About page. The Appliance ID also appears on labels on the search appliance chassis.

Overview

Replacing a hard disk drive consists of:

  1. Verifying the current state of the hard disk drive.
  2. Contacting Google Customer Support to get authorization for a replacement hard disk drive.
  3. Replacing the hard disk drive in the search appliance, processing unit, or storage unit with the new hard disk drive from Google.
  4. Verifying that the new hard disk drive works correctly.

Working with Hard Disk Drives

The hard disk drives in the search appliance, processing unit, and storage unit are hot-swappable, which means that there is no service interruption during the process of changing a disk. The hard disks operate in a RAID (redundant array of independent (or inexpensive) disks) disk array so that data is stored across more than one disk drive. RAID is a virtual collection of two or more disk drives that enables fault tolerance and performance.

Diagnose and replace a hard disk drive from the front of the search appliance, processing unit, or storage unit while the device is in its rack and running. No tools are required to replace a hard disk drive. Exercise caution when working around powered devices to prevent injury to you or damage to the equipment.

Dispose of the failed hard disk drive at your site in accordance with your security policy.

Note: Replacing a hard disk drive can be completed within 15 minutes, however, the hard disk drive takes about five minutes to come online, and several hours for the RAID controller to rebuild the data on the new disk drive.

Verifying the RAID Hard Disk Drive Status

You can verify the current state of RAID hard disk drives from either the Admin Console or from the front of the search appliance, processing unit, or storage unit after you remove the front bezel panel. If you see a RAID hard disk drive failure, contact Google Customer Support (see Contacting Customer Support).

This section consists of the following topics:

Checking Status from the Admin Console

You can view the RAID hard disk drive status on the Admin Console Status and Reports > System Status page.

The following table lists the meaning of the RAID indicator in the System Status page of the Admin Console.

Note: In the RAID Message column in the following table, controller 0 refers to the G100, G500, or GB‑7007 search appliances.

RAID Indicator RAID Message Description Device
Green None RAID hard disk drives are working correctly. G-100 search appliance,
G-500 search appliance
Green A warning message A RAID hard disk drive on the device is in good health with some minor recoverable errors. Contact Google Customer Support. G-100 search appliance,
G-500 search appliance
Yellow Caution One or more RAID hard disk drives are rebuilding. The search appliance or processing unit are functioning normally. It is not necessary to report this status. G-100 search appliance,
G-500 search appliance
Red Drive n offline (unit 0) one drive down in array n A hard disk drive on the G-100, G-500 search appliance failed. Contact Google Customer Support. G-100 search appliance,
G-500 search appliance

Checking Status from a Device

The G100, G500 Google Search Appliances come with keys that you can use to remove the front bezel of the processing unit. After removing the bezel, you can find the failed drive that has a status indicator light that is blinking amber. You can get additional information from the System Status page of the Admin Console. See Checking Status After Opening the Bezel for the location of the drive status indicator light on a hard disk drive.

The following table lists the drive status indicator light conditions for the G100, G500 search appliances.

Indicator Light Condition Description
Amber Flashing amber eight times per second. The disk drive failed.
Green Steady green. The disk drive is online.
Green Flashes green four times per second. Drive is being identified by the RAID controller or is being prepared for removal.
Green Flashes green slowly—on 400 milliseconds, then off. RAID controller is rebuilding data on the new disk drive.
Green/Amber Flashing Flashes green, amber, and off. Green: 500 milliseconds, Amber: 500 milliseconds, Off: 1 second Predicted failure reported by the RAID controller.
Green/Amber Flashing Flashes green, amber, and off. Green: 3 seconds, Off: 3 seconds, Amber: 3 seconds, Off: 3 seconds Drive spinning down, non-failure condition.
Off Off The disk drive compartment is empty, the disk drive has not yet been discovered by the server, or the disk drive is an unsupported drive type.

Checking Status After Opening the Bezel

The front bezel key hole is located on the left side of the front bezel.

To open the front bezel panel and determine which hard disk drive failed:

  1. Open the front bezel:
    1. Unlock the bezel with the key.
    2. Swing the left end of the bezel away from the device to release the bezel.
    3. Set the bezel aside for later use.
  2. Locate the failed drive by looking for a flashing amber drive status indicator light on the failed drive.

    The G100, G500 search appliances have an LCD panel that turns amber during a drive failure and lists which drive failed. For more information, see Checking Status From a Device.

    The following illustration shows the location of the hard disk drive status indicator light that blinks amber when a disk drive fails. On the G100 and G500 search appliances, the hard disk drives are vertical instead of horizontal.

    T4

    On the G100 search appliance (T4 model), the drives are vertical and the slots are numbered as follows--note that the drives are not labeled:

    0 1 2 3 4 5 6 7 8

    Note: The last drive (drive 8) on the T4 is a SSD drive which is not replaceable.

    T5

    On the G100 search appliance (T5 model), the drives are vertical and the slots are numbered as follows--note that the drives are not labeled:

    0 1 2 3 4 5 6 7 8 9

    Note: The last two drives (drive 8 and 9) on the T5 are SSD drives which are replaceable. Please contact technical support for assistance.

    U3

    On the G500 search appliance (U3 model), the front drives are vertical and the slots are numbered as follows--note that the drives are not labeled:

    0 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 17 18 19 20 21 22 23

    The G500 (U3) also has 2 horizontal drives in back (a total of 26 drives). These two drives are on top of the power supply and the slots are labeled 24 and 25.

    U4

    On the G500 search appliance (U4 model), the front drives are vertical and the slots are numbered as follows--note that the drives are not labeled:

    0 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 17 18 19 20 21

    Note: The last two drives (drive 20 and 21) on the U4 are SSD drives which are replaceable. Please contact technical support for assistance.

Contacting Customer Support

If you see a RAID failure in the Admin Console, contact Google Customer Support to verify the problem and get authorization for a replacement disk drive to be sent to you. If remote access is available to the search appliance, Customer Support can verify the drive state and may be able to get a failed disk drive back on line.

You can contact Customer Support at https://support.google.com/googleforwork/answer/142244#search. To log into the Google Cloud Technical Support web site, use the name and password included in the email sent to your primary contact who placed your order.

Replacing a Hard Disk Drive

After you remove a failed hard disk drive, dispose of the failed hard disk drive at your site in accordance with your security policy.

This section consists of the following topics:

Replacing a G100, G500 Search Appliance Failed Disk Drive

The following illustration shows a hard disk drive on a G100, G500 search appliance:

Note: On the G100 and G500 search appliances, the hard disk drives are vertical instead of horizontal.

To replace a failed hard disk drive:

  1. Press the button on the front of the disk drive and swing the hard drive carrier handle to the right to release the drive.
  2. Pull the handle toward you to pull the unit out of its drive compartment.
  3. (Optional) You can reseat the hard disk drive back in its compartment to see if the problem clears.
  4. Slide the hard disk drive out until it is free of the drive compartment, and place the disk drive aside.
  5. Unpack the new replacement hard drive. Remove the old drive from drive carrier and put the new drive in.
  6. While holding the new disk drive, press the button on the front of the drive to open the handle.
  7. Push the hard drive into the drive compartment until the drive is firmly positioned.
  8. Close the hard drive carrier handle to lock the drive in place.
  9. After you insert a disk drive, the RAID controller takes approximately five minutes before starting to blink green. During the interval, the indicator light is off.

Proceed to Verifying that the New Hard Disk Drive Works.

Replacing a G100 Solid State Drive (T5 and U4 models)

The following illustration shows a solid state drive on a G100 T5 or U4 model:

Note: Wait until the indicators are off on the SSD carrier before removing the SSD.

To replace a failed solid state drive:

  1. Locate the failed SSD. SSDs are located in slots 8 and 9.
  2. Press the release button to open the SSD carrier release handle.
  3. Slide the SSD carrier out until it is free of the SSD slot.
  4. Pull out on the edges of the SSD carrier in the direction of the arrows marked on the carrier, and disengage the SSD.
  5. Slide the SSD out of the SSD carrier.

  6. If you are not replacing the SSD immediately, insert an SSD blank in the empty SSD slot. To maintain proper system cooling, all empty SSD slots must have SSD blanks installed.
  7. Align the new SSD with the SSD carrier so that the connectors on the SSD face up and match the connector alignment label on the SSD carrier.

    Notes:

    • Ensure that the adjacent drives are fully installed. Inserting a SSD carrier and attempting to lock its handle next to a partially installed carrier can damage the partially installed carrier's shield spring and make it unusable.
    • To avoid damaging the SSD or the SSD carrier, do not use excessive force while installing the SSD in the SSD carrier.
  8. Slide the new SSD into the SSD carrier until it is secured.

Verifying that the New Hard Disk Drive Works

To verify that the RAID hard disk drive is rebuilding:

  1. Check the hard disk drive carrier indicator LEDs:
    • 1—Drive activity indicator
    • 2—Drive status indicator
  2. In approximately five minutes after you install the new hard disk drive, both the drive status indicator light and the drive activity indicator light blink green, indicating that the RAID controller is rebuilding the data on the new disk drive.
  3. After the LED blinks green, verify in the Admin Console that the RAID status displays Rebuilding. The Admin Console also displays a percentage indicator of how much data has been copied to the new disk drive. Note that the color indicator on the Admin Console stays red during the RAID rebuilding.
  4. After a few hours, the drive status indicator LED on the disk drive changes to steady green, and the Admin Console lists the RAID status as green.

Once the status indicator light is steady green, proceed to the next section to close the bezel.

Closing the Bezel

As described in Step 4 of Verifying that the New Hard Disk Drive Works, the new hard disk drive requires several hours to rebuild. You may want to wait on closing the bezel until the status indicator light is steady green.

To close the bezel:

  1. Fit the hinge tabs on the right of the bezel into the slots on the front panel.
  2. Swing the bezel left back toward the unit.
  3. Lock the bezel and put the key in a safe place.
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