Installation and User's Guide

Working with hot-swap drives

This section explains how you can increase the storage unit capacity by adding more drives or replacing existing drives with larger capacity drives.

Before you install or remove drive CRUs, review the following information:

Hot-swap hardware

You can replace a failed hard disk drive without switching off the storage unit. Therefore, you can continue to operate your system while a hard disk drive is removed or installed. These drives are known as hot-swap drives.

Drive CRUs

Your storage unit supports IBM Ultra160 and IBM Ultra2 SCSI hard disk drives. These IBM drives come pre-installed in a drive tray, ready for installation. (Do not detach the drive from the tray.) This drive and tray assembly is called a drive customer replaceable unit (CRU). You can install the drive CRUs directly into the 14 drive bays on the front of the storage unit. Be sure to record the location information for each drive before you remove it. Ensure that you keep track of the drives and their corresponding bays. Also, record the location information in "Installed-device records".

Attention: If you re-install a drive in the wrong bay, you could lose data.

Drive LEDs

Each drive bezel has two LEDs, which indicate the status for that particular drive. The drive LED states and descriptions are as follows:

LED	LED State	Description
Activity LED	Green/flashing	Flashes during read/write or inquiry operations to the drive.
Fault LED	Amber/flashing	Flashes to indicate a drive rebuild is under way, or that a drive has been identified by software.
Fault LED	Amber On	On to indicate a drive failure.

Filler panels

Filler panels are used when storage units are shipped without a full set of drives (14).

Hard disk drives

You can install only slim hot-swap drive CRUs in the storage unit.

Installing hot-swap drives

Use the following procedure to

install drives in the storage unit. You can install additional drives while the storage unit is switched on.

Note:

If you are replacing a drive, see "Replacing hot-swap drives".

1. Read the instructions that come with the drive CRU.
2. Check for fault LEDs. If any amber LEDs are lit, refer to "Troubleshooting".

   
   

3. Determine the bay into which you want to install the drive.
4. Remove the filler panel.
   1. Insert a finger into the square hole at the top of the filler panel to grip and pull the panel out of the drive bay.
   2. Save the filler panel for later use.
5. Install the drive CRU:

   Note:

   The hard disk drive comes with a tray already attached. Do not attempt to detach the drive (4) from the tray (3).

   
   

   1. Release the blue latch (1) on the drive CRU by pressing on the inside of the bottom of the tray handle (2).
   2. Pull the handle (2) on the tray out into the open position.
   3. Slide the drive CRU into the empty bay until the tray handle (2) touches the expansion-unit bezel.
   4. Push the tray handle (2) down into the closed (latched) position.
6. Check the drive LEDs.
   1. When a drive is ready for use, the green activity LED and the amber fault LED are off.
   2. If the amber fault LED is on, remove the drive from the unit and wait 10 seconds; then, reinstall the drive.
      

      ServeRAID information In some cases, the ServeRAID controller will automatically reset the drive to the Hot Spare or Rebuild state. If the drive state change does not occur automatically (amber LED stays lit), refer to your ServeRAID documentation for information about manually changing the state of the drive from the current state to another state, such as Hot Spare or Ready. The amber LED should switch off within 10 seconds after the drive-state change.

7. Configure the drive using the appropriate software.

Replacing hot-swap drives

Drive problems include any malfunctions that delay, interrupt, or prevent successful I/O activity between the hosts and the hard disk drives in the storage unit. This includes transmission problems between the host controllers, the ESM boards, and the drives. This section explains how to replace a failed drive.

Attention: Failure to replace the drives in their correct bays might result in loss of data. If you are replacing a drive that is part of a RAID level 1 or RAID level 5 logical drive, ensure that you install the replacement drive in the correct bay.

Check the hardware and software documentation provided with your system to see if there are restrictions regarding hard disk drive configurations. Some system SCSI configurations might not allow mixing different drive capacities or types within an array.

To replace a hot-swap drive:

1. Determine the location of the drive that you want to remove.

   Attention: Never hot swap a drive CRU when its green activity LED is flashing. Hot swap a drive CRU only when its amber fault LED is lit (not flashing) or when the drive is inactive (activity LED is off).

2. Remove the drive CRU.
   1. Press on the inside of the bottom of the tray handle (2)to release the blue latch (1).
   2. Pull the handle (2) on the tray (3) out into the open position.
   3. Lift the drive tray partially out of the bay.
   4. To avoid possible damage to the drive (4), wait at least 20 seconds before fully removing the drive CRU from the storage unit, to allow for the drive to spin down.
   5. Verify that there is proper identification (such as a label) on the drive CRU, and then slide it completely out of the storage unit.
3. Install the new drive CRU.

   
   

   1. Gently push the drive CRU into the empty bay until the tray handle (2) touches the storage unit tray.
   2. Push the tray handle (2) down into the closed (latched) position.
4. Check the drive LEDs.
   1. When a drive is ready for use, the green activity LED and the amber fault LED are off.
   2. If the amber fault LED is on, remove the drive from the unit and wait 10 seconds; then, reinstall the drive.
   
   

   ServeRAID information In some cases, the ServeRAID controller will automatically reset the drive to the Hot Spare or Rebuild state. If the drive state change does not occur automatically (amber LED stays lit), refer to your ServeRAID documentation for information about manually changing the state of the drive from the current state to another state, such as Hot Spare or Ready. The amber LED should switch off within 10 seconds after the drive-state change.