NOTE: The Break Mirror operation is not available within the booted operating system environment. It is only available in the BIOS Configuration Utility (<Ctrl> <R>) utility and the UEFI RAID configuration utility.
Break mirror in BIOS configuration utility
The RAID 1 virtual disk that you wish to split must be in an optimal state, and it cannot be running any other background tasks.
To use the Break Mirror feature from the BIOS Configuration Utility (<Ctrl> <R>), perform the following steps:
1.During boot up, press <Ctrl> <R> when prompted by the BIOS screen. If there is more than one controller in the system, choose the controller.
The VD Mgmt screen is displayed by default.
2.Highlight the appropriate Disk Group.
3.Press <F2> to display the available actions.
4.Choose Break Mirror and press <Enter>.
A dialog box is displayed describing the operation and asking if you are sure you want to perform the operation.
5.Select Yes to continue.
The exported disk (exporting configuration) spins down and the hard drive status LED starts flashing to identify which drive must be removed.
The remaining disk (exporting configuration) is in a degraded state until the missing member is replaced or rebuilt.
If there are any Global or Dedicated Hot Spare assigned, which fulfills the rebuild requirements for the degraded RAID 1 disk, a rebuild starts automatically. If there is no hot spare assigned, then an hot spare that meets all the requirements for the virtual disk must be assigned before the rebuild starts.
NOTE: Importing a broken mirror is the same as importing a foreign configuration. See
Importing Or Clearing Foriegn Configurations Using VD Mgmt Menu. The imported virtual disk
is in a degraded state until the missing member is rebuilt.
Managing preserved cache
If a virtual disk goes offline or is deleted goes of missing physical disks, the controller preserves the dirty cache from the virtual disk. The preserved dirty cache, known as pinned cache, is preserved until you import the virtual disk or discard the cache.
NOTE: Certain operations, such as creating a new virtual disk, cannot be performed if preserved cache exists. You have to enter the BIOS Configuration Utility (<Ctrl> <R>) to resolve the situation before you boot to the operating system. Messages are displayed notifying you that you must enter the BIOS Configuration Utility (<Ctrl> <R>) to discard the preserved cache or import the virtual disks with the preserved cache.
CAUTION: If there are any foreign configurations, it is strongly advised that you import the foreign configuration before you discard the preserved cache. Otherwise, you might lose data that belongs with the foreign configuration.
To manage the preserved cache:
1.On the VD Mgmt screen, click on a controller icon.
2.Press <F2> to display the available actions.
3.Select Manage Preserved Cache.
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