We had issues like this 18 months ago. It coincided with us adding some new
HBAs to balance the load. It transpired that one of the HBAs was silently
corrupting the data as it was writing it to tape. We only realised when we
came to read the data back. The problem was that the same HBA was being
used to write data to both the local (primary) and remote (copy) storage
pools over a long-distance SAN, so we lost some data.

Once we identified the HBA as the source of the problem and removed it, we
then had the task of identifying every tape that had been written using it.
Almost all were bad! We deleted the copy tapes and for primary tapes, we
restored from copy tapes where possible.

The HBA - an Emulex LP9802 - was described as having 'end-to-end parity
protection' but this didn't work for us. I opened a PMR, but IBM made the
observation that they are not responsible for the data after it has been
passed to the HBA.

So maybe one of your SCSI/FC adapters has gone bad?

Regards
Neil Schofield
Yorkshire Water Services Ltd.



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