The Question is:
Do I configure4 a LAN based Cluster, using two DS20 Machine, without using a
The Answer is :
SCSI itself is not a cluster communications interconnect.
You can decide to configure this environment with or without multi-host
SCSI. If you choose to have these AlphaServer DS20 systems connected
together with one or more multi-host SCSI buses, you can have any of a
variety of disks and SCSI HSZ-series storage controllers connected to
any of these multi-host SCSI buses. (Tapes and other "non-reentrant"
SCSI devices are not permitted on multi-host SCSI buses.)
The need for one or more cluster communications interconnects, as well
as a requirement for total connectivity among all of the cluster member
nodes, is central here -- this means you must have a CI, Ethernet, FDDI
or other cluster communications interconnect configured here for this to
be a functional cluster.
If you do have a multi-host SCSI configuration, all OpenVMS hosts
sharing the SCSI bus must be members of the same cluster. You must
also maintain your SCSI storage configuration -- this includes any
internal and any external SCSI devices you might have configured and
all cabling and termination -- within the requirements of the
applicable SCSI standards.
The OpenVMS Wizard would recommend skimming through the available
cluster documentation in the OpenVMS manual set, as well as skimming
the information on VOTES and EXPECTED_VOTES in the OpenVMS FAQ.