Working With Mirrored Arrays - NEC Express 5800 Series User Manual

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Working with mirrored arrays

Among the advanced tasks possible with the SSA GUI, you can split a mirrored array and then recombine it.
This process entails splitting 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 SSA GUI must be run in offline mode

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.
Splitting a mirrored array
Procedure
Run the SSA GUI in offline mode. See
1.
Open the Configure panel by doing one of the following:
2.
o
Choose a device and click Configure in the quick navigation menu.
o
Select an available device from the Home screen, and then click Configure under the available
options.
Select Arrays from the Devices menu.
3.
From the Arrays menu, select the appropriate array.
4.
Select Manage Data Drives from the Actions panel.
5.
Under Available Array Action(s), select Mirror Array.
6.
Select a physical drive.
7.
Click OK.
8.
The mirrored array details are displayed.
Click Finish.
9.
When SSA finishes splitting the array, two logical drives appear in the Arrays menu:
10.
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.
Shut down the OS.
11.
Power down the server.
12.
With power off, remove the physical drives that constitute one of the new arrays.
13.
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.
14.
Restart the OS.
15.
("Accessing SSA in the offline
"Accessing SSA in the offline
environment").
environment."
SSA graphical user interface 31