HP A3550A - High Availability Disk Arrays Model 20 Storage Enclosure User Manual page 123

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Failing Continue after
component failure?
Disk module Yes
SP Yes
Fan pack Yes
Power supply Yes
SCSI-2 adapter/ Yes
cable
4-16
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.
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 switches
automatically 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.
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. If the SCSI-2
adapter or SCSI-2 cable fails, can regain access to the LUNs
associated with the failed SP, host adapter, or SCSI-2 cable
only if changes are made manually in Grid Manager and LVM.