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108
Topologies for HP-UX
Table 8
Basic Topology Error Recovery
Failing
component Continue
after failure
What happens and how to recover
Disk module Yes 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.
Controller
module in
single-
controller
module array
(no high
availability) No The disk array fails. The system administrator or service provider
replaces the controller module and the system administrator
restarts the operating system and applications.
Controller
module in
dual
controller
module disk
array No on path to
failed controller
module;
Yes on alternate
path through
second
controller
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
controller module.
Fan module Yes Applications continue to run. The system administrator or service
provider hot-swaps the fan module.
Power
supply
modules Yes Applications continue to run when one power supply module fails.
The system administrator or service provider hot-swaps the failed
power supply module.
Fibre
Channel I/O
adapter No on path to
failed adapter;
Yes if array has
dual controller
modules and
alternate paths
have been
configured 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.