User's Manual

90 Controllers
NOTE: When creating a virtual disk on a controller that is in a cluster configuration,
you must specify the maximum virtual disk size.
1 Stop the clustering services on system B.
2 Turn off system B.
3 Create or delete the virtual disk on system A. For more information on
creating and deleting virtual disks, see:
– Considerations Before Creating Virtual Disks
–Creating Virtual Disks
– Virtual Disk Task: Delete
4 Reboot system A.
5 Restart system B.
Integrated Mirroring and the PERC 4/IM
Controller
The PERC 4/IM controller enables you to mirror a physical disk that resides
internally in the server. This feature can be used to mirror the system’s boot
drive from one physical disk to another, ensuring that the system remains
running in the event that one of the physical disks fails. The PERC 4/IM
controller firmware maintains the mirrored data on both physical disks so that
the system’s CPU is not burdened with the extra processing required to
maintain the mirrored data.
When implementing mirroring on a PERC 4/IM controller, you use the
controller BIOS to create a virtual disk from the physical disks. Unlike
creating a virtual disk on other controllers, the PERC 4/IM controller is able
to implement a mirror for a physical disk that already contains data. The data
is then copied to the mirror. Any data previously residing on the mirror is
overwritten.
After you have created the integrated mirror using the controller BIOS, the
operating system sees the mirror as a virtual disk and a virtual disk object for
the mirror is displayed in the Storage Management tree view. Expanding the
Virtual Disks object displays the disks included in the mirror. These physical
disks are no longer individually visible to the operating system.