Promise Technology EX8654 With a Hot Spare Drive, Without a Hot Spare Drive, Rebuild Operation

Chapter 7: Technology Background

With a Hot Spare Drive

When a physical drive in a disk array fails and a spare drive of adequate capacity is available, the disk array will begin to rebuild automatically using the spare drive.

After the disk array rebuilds itself using the spare drive, you must replace the failed drive.

To set up a spare drive, see “Creating a Spare Drive” on page 173.

Without a Hot Spare Drive

If there is no hot spare drive of adequate capacity, you must remove the failed drive and install an unconfigured replacement drive of the same or greater capacity in the same slot as the failed drive. Until you install the replacement drive, the logical drive will remain Degraded.

•If the Auto Rebuild function is ENABLED, the disk array will begin to rebuild automatically as soon as you replace the failed drive.

•If the Auto Rebuild function is DISABLED, you must manually rebuild the disk array after you replace the failed drive.

To enable Automatic Rebuild, see “Making Background Activity Settings” on page 133.

To set Hot Spare Policy, see “Making Spare Drive Settings” on page 174.

Important

If your replacement physical drive was formerly part of a different disk array or logical drive, you must clear the configuration data on the replacement drive before you use it.

See “Clearing Stale and PFA Conditions” on page 149 or page 265.

Rebuild Operation

During rebuild:

•The alarm sounds two short beeps, repeated

•No warning icon displays over the disk array or logical drive icons

Management View reports the disk array’s Operational Status as OK, Rebuilding.

During rebuilding, you can still read and write data to the logical drive. However, fault tolerance is lost until the disk array returns to OK (not-rebuilding) status.

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