Working With Hot-Swap Drives - IBM TotalStorage 300 Service Manual

Working with hot-swap drives

This section explains how you can replace a defective drive.
Before you remove drive CRUs, review the following information:
v Drive CRUs: Your storage unit supports IBM Fibre Channel (FC) hard disk
v Drive CRU labels: A label is provided on the front of the drive CRU tray. Use
v Drive LEDs: Each drive tray has two LEDs, which indicate the status for that
v Fibre Channel loop IDs:
v Hot-swap hardware: Your storage unit contains hardware that enables you to
v Slim drives: Hot-swap drive CRUs that are slightly smaller in size than the
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
section explains how to replace a failed drive.
Before you begin
v Read the safety and handling guidelines provided in "Safety and
environmental notices" on page 173 and "Handling static-sensitive devices"
on page 102.
v Ensure that your current system configuration is working properly.
v Back up all important data before you make changes to storage devices,
such as hard disk drives.
drives. These IBM drives come preinstalled in a drive tray, ready for installation.
(Do not detach the drive from the tray.) This drive and tray assembly is called a
drive CRU.
this label to record the location information for each drive before you remove it.
Ensure that you keep track of the drives and their corresponding bays.
Attention: If you reinstall a drive in the wrong bay, you might lose data.
particular drive. The drive LED states and descriptions are as follows.
LED LED State
Activity LED Green flashing
Activity LED Green on
Fault LED Amber flashing
Fault LED Amber on
When you replace a drive CRU in the storage unit, the drive tray plugs into a
printed circuit board called the midplane. The midplane sets the Fibre Channel
loop ID automatically, based on the setting of the tray number switch and the
physical location (bay) of the drive CRU.
replace a failed hard disk drive without turning off the storage unit. Therefore, you
have the advantage of continuing to operate your system while a hard disk drive
is removed.
standard disk drive. These drive CRUs do not fill the entire drive bay. To maintain
proper air flow and cooling, you must use a slim filler piece with each slim drive.
Definitions
The green light flashes to indicate FC activity to the
drive.
The green light is on to indicate the drive is properly
installed.
The amber light flashes to indicate a drive rebuild is
under way, or that a drive has been identified by
software.
The amber light is on to indicate a drive failure.
Chapter 5. Installing and replacing IBM NAS 300 components
103