Post by Joukj
I have a MSA30.It seems to be a dual bus: if I connect the SCSI cable I
only see half of the disks. I still had a SCSI card from a single bus
type and tried to swap. This resulted in seeing none of the disks
Question: is this normal behaviour or is the SCSI card broken?
Various DEC SCSI enclosures were routinely sold in single and split-bus
configurations. Details and conversions varied by model or enclosure.
Some were permanently single-bus, some where split-bus, and some of
the split-bus configurations could be reconfigured to a single bus by
moving a backplane jumper pack or board.
I'm sure some folks have thought about being able to reconfigure the
SCSI bus backplane entirely in software too, but I've not seen one of
those available from DEC.
For the MSA30 series and specifically the MSA30-MI, see the dual-bus
— "or provides access from two different servers to two separate
storage areas.". The MI configuration was one of the very few "recent"
SCSI enclosures capable of and supported for multi-initiator
operations; of shared SCSI bus configurations in a cluster;
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