HP Array Configuration Utility 45
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 ("
About SAAP
" on page
8
).
•
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
1.
Run the ACU GUI in offline mode. See "Accessing ACU in an offline environment ("
Accessing ACU in
the offline environment
" on page
22
)."
2.
At the
Configuration
screen, select the appropriate controller from the
Controller/Device
menu.
3.
From the
Systems and Devices
tree, select the appropriate array.
4.
In the
Available Tasks
panel, click
Split Mirrored Array
.
5.
Click
OK
.
6.
When ACU finishes splitting the array, two logical drives appear in the
Systems and Devices
tree:
o
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
0 logical drive are created.
o
When an array that contains a RAID 10 (ADM) logical drive splits, a RAID 1+0 logical drive and a
RAID 0 logical drive are created.
7.
Shut down the OS.
8.
Power down the server.
9.
With power off, remove the physical drives that constitute one of the new arrays.
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.
10.
Power up the server.
11.
Restart the OS.
Recombining a split mirrored array
1.
Run the ACU GUI in offline mode. See "Accessing ACU in the offline environment (on page
22
)."
2.
At the
Configuration
screen, select the appropriate controller from the
Controller/Device
menu.
3.
From the
Systems and Devices
tree, select the array to use as the source array.
4.
In the
Available Tasks
panel, click
Re-Mirror Array
.
5.
Select the array to be mirrored to the source array.
