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loss of any power domain in this configuration, a using system continues to detect
either all the primary configuration disk drives, or one primary and one secondary
configuration disk drive, and continues to access the array without the need to set
the Split Array Resolution flag.
Operation after a Loss of Member Disks
An array goes into the Offline state if, after any component failure or change in
configuration, it becomes possible for the disk drives of mirrored pairs each to receive
different data from different systems. Under such conditions, the disk drives of a
mirrored pair might no longer contain matching data; that is, they are not synchronized.
An array can continue to operate although one of the following conditions might exist:
v The number of managing adapters is increased or decreased when all the primary
and secondary configuration disk drives are working.
v A primary disk drive is missing, cannot be read, or cannot be written, but the other
primary and secondary disk drives are working.
v The secondary configuration disk drive is missing, cannot be read, or cannot be
written, but both primary configuration disk drives are working
v Both primary configuration disk drives are missing, but the secondary configuration
disk drive is working, and all the adapters in the management list can be detected.
The adapter microcode automatically sets the Split Array Resolution flag.
v Both primary disk drives can be detected, but they cannot be read or written and the
secondary configuration disk drive is working. The adapter microcode automatically
sets the Split Array Resolution flag.
The array goes into the Offline state for the following errors or reconfiguration:
v Both primary configuration disks are missing and less than all the managing adapters
on the list are visible. Split Array Resolution needs to be set before operations to the
array can continue.
v The secondary disk drives are missing and all the managing adapters are missing.
v The primary side of the array initializes, read or write operations are performed on
the array, and the Split Array Resolution flag is not set on the primary configuration
disk drives. Later, the secondary configuration disk drive appears. Its Split Array
Resolution flag is set. Under these conditions, both the primary side and the
secondary side might have been written independently, and the data might not be
consistent on the mirrored pair members. You must determine whether the correct
data is on the primary side or on the secondary side. Then you must reinitialize by
changing the value of the Split Array Resolution flag on the side that does not have
the correct data.
The HotSpareSplits parameter can be used to control whether hot spare disk drives are
to be introduced when exactly half the member disk drives of an array are missing. In a
split-site configuration when one site loses access to the other, it might be desirable
that hot-spare disk drives are not introduced while half the disk drives are no longer
visible. When the HotSpareSplits flag is set to off and all the secondary disk drives and
the other adapter are not visible, hot spare disk drives are not introduced. Similarly, hot
194 User’s Guide and Maintenance Information
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