HP Surestore Disk Array 12h and FC60 - Manual (Page 123)

Topologies for HP-UX 123
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Table 11 High Availability, Distance, and Capacity 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
modules 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
failed 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.
HP Fibre
Channel-AL
Hub No on path to
failed hub;
Yes on alternate
path to other
pair of hubs 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.
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.