Table of Contents
Advertisement
While in Degraded state, an array is not protected. If another disk drive in the array
fails, or the power fails during a write operation, data might be lost.
You can return the disk drive to the array, or install another disk drive by using the
procedure in step 37 on page 473 of MAP 2324: SSA RAID to logically add the device
to the array. The array management software starts a rebuilding operation to
synchronize the new disk drive with the data that is contained in the other disk drives of
the array. This action returns the array to the Good state.
Rebuilding State
A RAID-5 array enters the Rebuilding state when:
v That array is first created
v A member disk drive is replaced
v An adapter is replaced, but a correct shutdown has not been performed
Initial Rebuilding Operation
When an array is first created, it enters the Rebuilding state while parity is rebuilt. If a
disk drive fails during the initial rebuilding operation, no hot spare disk drive is
exchanged for the failing disk drive.
Disk Drive Replacement
An array enters Rebuilding state after a missing disk drive has been returned to the
array or exchanged for a replacement disk drive. When the array is in this state, all the
member disk drives are present, but the data and parity are being rebuilt on the
returned or replacement disk drive. The array management software allows read and
write operations on a disk drive that is in Rebuilding state. If the power fails before the
rebuilding is complete, the array management software restarts the complete rebuilding
operation when the power returns.
Adapter Replacement
If, for any reason, an adapter is exchanged for a replacement adapter, and a correct
shutdown has not been performed, the parity is rebuilt on all the associated arrays
when the replacement adapter powers on.
Offline State
A RAID-5 array enters Offline state when two or more member disk drives become
missing. Read and write operations are not allowed.
34
User's Guide and Maintenance Information
Advertisement
Table of Contents
