HP A3550A - High Availability Disk Arrays Model 20 Storage Enclosure User Manual page 119

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Failing Continue after
component failure?
Disk module Yes (9.04)
Yes (10.x)
SP *No (9.04)
Yes (10.x)
Fan pack Yes (9.04)
Yes (10.x)
Power supply Yes (9.04)
Yes (10.x)
SCSI-2 adapter/ *No (9.04)
cable *No (10.x)
4-12
What happens and how to recover
Provides the same features as the basic configuration, but
with better performance and higher availability. 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 the SP ownership of the LUNs for the
failed SP or failed host adapter by using LVM and Grid
Manager, respectively.
HP-UX 10.x
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. The 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. The System
Administrator can transfer control to the other SP and adapter
by changing host(s) and array configuration.