HP A3550A - High Availability Disk Arrays Model 20 Storage Enclosure User Manual page 135

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Failing Continue after
component failure?
Disk module Yes
SP Yes
Fan failure Yes
within fan pack
Power supply Yes
SCSI-2 adapter/ No*
cable
5-12
What happens and how to recover
Provides the same features as the basic configuration but with
better performance and higher availability. With RAID of any
level supported by MPE/iX, applications continue running.
System Administrator or service provider replaces module.
If one SP fails, the System Administrator can access the LUNs
owned by the failed SP by accessing the remaining
operational SP with the other host. If a host adapter fails, the
System Administrator can access the LUNs in the array with
the other host adapter. The System Administrator must
change the path and SP ownership of the LUNs for the failed
SP or failed host adapter by using SYSGEN and ioconfig,
respectively. There is no automatic transfer of LUN ownership
or path for this configuration type.
Applications continue running. System Administrator or
service provider replaces module.
If a redundant power supply module is present, applications
continue running; otherwise, disk array fails. Service provider
replaces power supply and System Administrator restarts the
operating system, if necessary.
I/O operations fail to all physical disk units configured on SP
attached to a failed SCSI-2 adapter/cable. System
Administrator can transfer control to the other SP by changing
host(s) and array configurations.