R/Evolution 2000 Series Troubleshooting Manual page 44

If two drives fail and only one properly sized spare is available, an event
■
indicates that reconstruction is about to start. The Reconstruct utility starts to run,
using the spare, but its progress remains at 0% until a second properly sized spare
is available.
If a drive fails during online initialization, the initialization fails. In order to
■
generate the two sets of parity that RAID 6 requires, the RAID controller fails a
second drive in the virtual disk, which changes the virtual disk status to Critical,
and then assigns that disk as a spare for the virtual disk. The Reconstruct utility
starts to run, using the spare, but its progress remains at 0% until a second
properly sized spare is available.
The second available spare can be an existing global spare, another existing spare
for the virtual disk, or a replacement drive that you designate as a spare or that is
automatically taken when dynamic sparing is enabled.
During reconstruction, though the critical virtual disk icon
continue to use the virtual disk. When a global spare replaces a drive in a virtual
disk, the global spare's icon in the enclosure view changes to match the other drives
in that virtual disk.
Note –
disk RAID level and size, drive speed, utility priority, and other processes running
on the storage system. You can stop reconstruction only by deleting the virtual disk.
44 R/Evolution 2000 Series Troubleshooting Guide • May 2008
Reconstruction can take hours or days to complete, depending on the virtual
is displayed, you can