HP A3550A - High Availability Disk Arrays Model 20 Storage Enclosure User Manual page 117

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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 Yes (10.x)
4-10
What happens and how to recover
Applications continue running. System Administrator or service
provider replaces module.
Provides the same features as the basic configuration, but with
better performance and higher availability. Applications can
continue to run after the failure of a single disk module.
HP-UX 9.04
If an SP fails, the System Administrator must use Grid Manager
to reassign ownership of the failed SP's LUNs to the operational
SP. Also, the path to the operational SP must be used and can
be changed by way of LVM. Once these changes have been
made, access to all LUNs on the array is possible.
HP-UX 10.x
If one SP fails, ownership of the failed SP's LUNs can transfer
automatically to the remaining operational SP. If a primary and
an alternate path have been configured in LVM, LVM
automatically switches to the alternate path. These operations
are transparent to the user.
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.
HP-UX 9.04
If the adapter/cable fails, the System Administrator must access
the array through the operational SCSI-2 adapter's path. LUN
ownership and path changes need to be made using Grid
Manager and LVM, respectively.
HP-UX 10.x
If the adapter/cable fails, LUN ownership transfers and LVM
switches to the alternate path automatically and transparently.