Nortel Server 1005r Maintenance And Diagnostics page 148

RAID operations
At this point, the RAID is split, and the drive marked FAILED is the
backup drive and is no longer written to. You can install a PEP on
the system and use the backup drive to back out of the installation.
ATTENTION
Figure 34: MegaRAID Power Console Plus drive status
RAID synchronization after installing a PEP
Resynchronize the RAID after you perform a software upgrade with a
PEP.
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Do not make the failed drive online at this point, or data
corruption can occur. If you failed the wrong drive by
mistake, you must select rebuild to bring it back into
service.
Standard 1.10
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