Repairs to the failed component in the data path should be
performed as soon as possible to avoid a double failure on the HA
array. The more ldevs routed through a single device adapter card,
the greater the I/O workload and possible I/O performance degradation.
High availability arrays like the HP XP256 have many redundant subsystems
including dual controllers. If an array controller is the source problem for
data path failure, the controller can be replaced "hot swapped" while
the system and array are online.
Other data path components, such as SCSI bus cabling and device adapter
cards, cannot be replaced online and require the system be shut down
and powered off for repairs.
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