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Array is Offline because Adapter Is Not Known to the Remaining Half of the
Array
When this condition exists, the host system generates SRN 48755.
To maintain data consistency, SSA RAID-1 and RAID-10 arrays keep a record of the
adapters to which they are connected. If exactly one half of the array is connected to a
different adapter, the array remains in the Offline state unless you take specific action to
make the array available.
This type of problem can be caused by:
v Incorrect reconfiguration of an array
v Simultaneous failure of an SSA adapter and a disk drive
Failure of an Adapter and a Disk Drive
In Figure 37, an SSA adapter and a disk drive have failed. When a new adapter is
installed, the array remains in the Offline state until the state of the Split Array
Resolution flag is changed back to Primary.
System 1
SSA Adapter
Primary 1
Secondary 1
Figure 37. Failure of an Adapter and a Disk Drive
Chapter 8. Split-Site Management 203