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The Question is:
We have a three node cluster consisting of two GS140s and an 8400 running Open
VMS 7.1-2. We have two storage works cabinet with 4 sets dual HSJ50
controllers. The HSJ controllers are connected through a CI star coupler. We
wish to install local drives i
nto the main CPU cabinet and make them available to the cluster.
Currently the ALLOCLASS sysgen parameter is set to 1 on all CPUs and
Controllers. Are vender support is telling us to change the allocation class
sysgen parameter on all three CPUs to make them unique. Another source of
technical information tells me th
e CPUs will only see disk drives connected to controllers that have the same
allocation class as the CPU. Can you shed any light?
The local drives will be SCSI connected to a KFTIA integrated I/O Module. Does
this require us to set the MSCP sysgen parameters to 1.
Thanks for all your help in the past.
Mike from Tallahassee
Senior System Programmer
The Answer is :
Your vendor telling you that you should consider changing the host
allocation class on the host is correct, as duplicate unit numbers
are forbidden within any disk or any tape allocation class. On
recent OpenVMS versions, a port allocation class can be used, and
this mechanism provides rather better granularity than does the host
allocation class.
Your source of technical information, on the other hand, is incorrect.
To serve through the devices from a storage controller to other cluster
members, the OpenVMS system must typically be in the same allocation
class as the storage controller. Since you are not serving through the
storage to other cluster members, this restriction does not apply.
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