Configuring an Array

3.Exit from the previous screen, and then move the highlight to the logical drive. If the controller has a battery-backed write cache, there should be an entry Disable Cache in the right-hand panel, implying that the cache is enabled. If the entry is Enable Cache, the cache is currently disabled; enable it.

4.In the Logical Configuration View panel, select the array that you want to expand, and then press the Enter key.

5.Select Expand in the menu, and then press the Enter key.

6.Select the hard drive that you want to add to the array, and then press the Enter key.

IMPORTANT: Do not assign a group of physical drives to the same array unless they are of the same capacity. If the drives have different capacities, the excess capacity of the larger drives cannot be used by the array and is wasted.

7.Repeat step 6 until you have finished adding drives.

8.Select Accept Changes, and then press the Enter key.

9.Press the Esc key to begin the array expansion.

You can see the progress of the expansion at any time by pressing the F3 key and then scrolling to the progress bar near the bottom of the screen.

Migrating RAID Level or Stripe Size

Performance may be degraded slightly during migration, depending on the Expand (or Rebuild) Priority setting. To minimize any effect, migrate during periods of low server use.

NOTE: The migration process takes about 15 minutes per gigabyte. The controller is not able to expand or migrate any other logical drive during this time. Instead, further requests for expansion or migration will be queued.

1.Back up all data on the logical drive. Although migration is unlikely to cause data loss, observing this precaution provides extra security.

2.Highlight the controller in the Logical Configuration View panel, and then press the F3 key. Scroll down the screen until you reach the Array Accelerator section. The condition of the battery and cache should both be OK.

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HP Smart Array 641/642 Controller User Guide