The Question is:
What are the software options for automatic scsi channel failover
(redundancy) on a standalone OpenVMS (7.1-2) Alpha server 8400
with two kzpbsa-bb(A11) scsi boards?
The Answer is :
Options: Host-based volume shadowing with member volumes configured
on separate SCSI buses, or an upgrade to V7.2-1 or later and the use
of an HSZ70 or HSZ80 series storage controller(s) configured to span
across two SCSI buses.
In practice, the SCSI bus itself is rather less likely to fail than
the SCSI controller or the SCSI storage widget, and a controller
failure or various other host hardware failures can result in system
instability and system crashes.
Configurations involving an OpenVMS Cluster (and obviously an
additional OpenVMS Alpha system) can also be of interest here.
Configurations involving the (older) CI or the (newer) Fibre Channel
storage communications can also be of interest.