Compaq ProLiant Clusters HA/F100 Administrator's Manual page 58

2-24 Compaq ProLiant Clusters HA/F100 and HA/F200 Administrator Guide
The Compaq ProLiant Cluster HA/F200 further enhances high availability
through the use of additional, redundant, components in the server-to-storage
connection and in the shared storage system itself. In the event of a failure,
processing is switched to an alternate path without affecting applications and
end users. In fact, this path switch is transparent even to the Windows NT and
Windows 2000 file system (NTFS). The combination of multiple paths and
redundant hardware components provided by the HA/F200 offers significantly
enhanced high availability over non-redundant configurations.
A single component failure in the HA/F200 will result in an automatic failover
to an alternate component, allowing end users to continue accessing their
applications without interruption. Some typical failures and associated
responses in an HA/F200 configuration are:
I
A server failure will cause the Microsoft clustering software to fail
application processing over to the second server.
I
A host bus adapter failure will cause I/O requests intended for the failed
adapter to be rerouted through the remaining adapter.