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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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