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Working with mirrored arrays
Among the advanced tasks possible with the ACU GUI, you can split a mirrored array and then recombine
it. This process entails breaking a RAID 1 or RAID 1+0 mirror into two identical new arrays consisting of RAID
0 logical drives.
Support for these procedures requires the following:
•
The ACU GUI must be run in offline mode.
•
Select controller models must have a valid SAAP license
•
Mirrored arrays being split can have RAID 1, RAID 1+0, RAID 1 (ADM), or RAID 10 (ADM)
configurations. Arrays with other RAID configurations cannot be split.
Several reasons exist for splitting and recombining a mirrored array. For more information, see the "RAID
1(+0): breaking mirrors and rebuilding drives" how-to white paper on the HP website
(http://h20000.www2.hp.com/bc/docs/support/SupportManual/c00378986/c00378986.pdf).
Splitting a mirrored array
Run the ACU GUI in offline mode. See "Accessing ACU in an offline environment
1.
the offline
At the Configuration screen, select the appropriate controller from the Controller/Device menu.
2.
From the Systems and Devices tree, select the appropriate array.
3.
In the Available Tasks panel, click Split Mirrored Array.
4.
Click OK.
5.
When ACU finishes splitting the array, two logical drives appear in the Systems and Devices tree:
6.
When a RAID 1 or RAID 1+0 array splits, two RAID 0 logical drives are created.
o
When an array that contains a RAID 1 (ADM) logical drive splits, a RAID 1 logical drive and a RAID
o
0 logical drive are created.
When an array that contains a RAID 10 (ADM) logical drive splits, a RAID 1+0 logical drive and a
o
RAID 0 logical drive are created.
Shut down the OS.
7.
Power down the server.
8.
With power off, remove the physical drives that constitute one of the new arrays.
9.
If you do not remove the physical drives for one of the arrays, the OS will be unable to distinguish
between the two arrays when the server is restarted, because the arrays are identical.
Power up the server.
10.
Restart the OS.
11.
Recombining a split mirrored array
Run the ACU GUI in offline mode. See "Accessing ACU in the offline environment (on page 22)."
1.
At the Configuration screen, select the appropriate controller from the Controller/Device menu.
2.
From the Systems and Devices tree, select the array to use as the source array.
3.
In the Available Tasks panel, click Re-Mirror Array.
4.
Select the array to be mirrored to the source array.
5.
environment" on page 22)."
("About
SAAP" on page 8).
HP Array Configuration Utility 45
("Accessing ACU in
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