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This manual documents the High Availability FailOver/iX (HAFO) utilities
for the HP e3000 systems. HAFO works in a manner similar to UNIX
dual PVLINKS.
Once installed and configured, these utilities provide continued
data access on the XP 256 high availability disk array.
There are five "points of failure" in any I/O subsystem. They are:
Disk drive mechanisms Power supply Disk controller I/O host adapter card Cabling and terminators
High availability arrays protect against the first two points of failure
by having:
The HAFO utilities provide protection for the remaining three points of failure:
Protection against array controller failure is accomplished with HAFO software
working in conjunction with a special array hardware configuration.
The array hardware itself allows for two controllers to be configured
to talk to the same ldevs. These can then be configured in HAFO
to be the primary and alternate path to the same ldev. When there
is a failure, the HAFO software detects it and transparently reroutes
I/O to the alternate path.
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