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v Both member disk drives of a mirrored pair are missing, deconfigured, or rebuilding.
Unknown State
A RAID-10 array is in the Unknown state when not enough array members are present
for the array configuration to be determined; that is, fewer than two of the first three
members are present. Unless the Split Array Resolution flag is set, the array enters the
Offline state to allow split arrays to operate if:
v The member disk drive that holds the configuration sector in the secondary half of
the array is available
and
v Neither of the member disk drives that hold configuration sectors in the primary half
of the array is available.
Multiple States
Different member disk drives of a RAID-10 array can be in different states. For
example, one mirrored pair might be rebuilding while, in a different pair, one member
disk drive is missing and the remaining member is in the Degraded state. A priority of
array states of the different members is used when the state of an array is reported
(highest priority first):
1. Unknown
2. Offline
3. Exposed
4. Degraded
5. Rebuilding
An error is logged whenever the state of an array changes, unless the state changes to
Good or Rebuilding.
38 User’s Guide and Maintenance Information