Recovering From Disk Failures 11
Replacing Internal Disks
To replace your system's internal disks, refer to the "Hard Drives" and
"Replacing a Hard-Drive Carrier" sections of your system's Hardware Owner's
Manual.
Replacing Disks in an External Storage Enclosure
To replace disk drives in an external Dell storage enclosure, refer to your
storage enclosure's Hardware Owner's Manual.
Recovering After a Disk Failure
This section describes steps you must follow, as well as procedures the system
will automatically perform, after you replace a failed disk. As mentioned
previously, your system will continue to operate if a single disk drive within a
RAID 5 group fails. However, if your system experiences two or more disk
failures in the same RAID group, data loss may result.
Single Disk Failure Recovery
After you replace a failed disk drive within a RAID 5 group, the system will
begin an automatic rebuild of the RAID group. The data on the virtual disks
that reside on the RAID group are still available to your operating system and
your system should run without interruption. Until the rebuild operation
completes, the RAID 5 virtual disks will be running in degraded mode and are
at risk of data loss should an additional disk fail. Using OMSA, you can
monitor the progress and status of the RAID 5 rebuild. If the rebuild does not
begin automatically, refer to the "Rebuild a Failed Physical Disk" section of
the OpenManage™ Server Administrator User's Guide to initiate the rebuild
manually.
Figure 3-2 shows how OMSA reports the status of a rebuilding RAID group.
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