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The Question is:
We are running a two-node SCSI cluster consisting of AXP 2100 4/200 under VMS
V7.1-2. Both systems are attached to a RA8000 storage system with redundant
HSZ70; these devices are seen as $1$DKBxxx. Both systems use PACs (2,3) for
their PKA controllers and
a host allocation class of 1. Everything works fine until an upgrade to VMS
V7.2-1. Then only the boot disk is still named $1$DKB100, all other disks are
now seen as $1$DKAxxx! Howzat? We immediately restored VMS V7.1-2 and
everything is fine again, but
we have to go to V7.2-1. What's wrong ?
The Answer is :
Nothing. This change is intentional and documented, and parallels
previous changes made to OpenVMS to bring all (served) disk device
names into the same controller letter. Each device unit number --
regardless of the controller -- must be unique within any non-zero
device allocation class. (The FAQ has some additional information
on device unit numbers and allocation class settings.)
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