HP Surestore Disk Array 12h - And FC60 Advanced User's Manual page 123

Table 11
High Availability, Distance, and Capacity Topology Error Recovery
Failing Continue
component after failure
Disk module Yes
Controller No on path to
modules failed controller
module;
Yes on alternate
path through
second
controller
module
Fan module Yes
Power supply Yes
modules
HP Fibre No on path to
Channel-AL failed hub;
Hub Yes on alternate
path to other
pair of hubs
Fibre Channel No on path to
I/O adapter failed adapter;
Yes if array has
dual controller
modules and
alternate paths
have been
configured
What happens and how to recover
Applications continue to run on all supported RAID levels (RAID-
1,
0/1, and 5). The system administrator or service provider hot-
swaps the failed disk module.
Ownership of the failed controller module's LUNs can transfer
automatically to the remaining operational controller module if
primary and alternate paths have been configured in LVM. If so,
LVM switches automatically and transparently to the alternate
path. The system administrator or service provider hot-swaps the
failed controller module.
Applications continue to run. The system administrator or service
provider hot-swaps the fan module.
Applications continue to run when one power supply module fails.
The system administrator or service provider hot-swaps the failed
power supply module.
I/O operations fail along the path to the failed HP Fibre Channel-
AL Hub. I/O operations can transfer automatically to the other
pair of cascaded
HP Fibre Channel-AL Hubs if primary and alternate paths have
been configured
in LVM. If so, LVM switches automatically and transparently to
the alternate path. The authorized service provider hot-swaps the
failed HP Fibre Channel-AL Hub.
I/O operations fail along the path through the failed adapter. If the
host has two Fibre Channel adapters connected to a dual-
controller module disk array, the array can be accessed through
the path to the operational adapter and controller module if
primary and alternate paths have been configured in LVM. If so,
LVM switches automatically and transparently to the alternate
path. The authorized service provider replaces the failed adapter
and the system administrator restarts the operating system and
applications.
Topologies for HP-UX
123