We have a 4D/420 server, until recently we had 7 Seagate 1.2 GBytes disks, 2 Exabytes and
a QIC150 attached. All was working Ok. We attached a new 1.6 GByte disk and that night the
overnight backup failed to finish on one Exabyte tape as it normally would, and recoverable
errors were reported in the region of 500,000 to 2,000,000. These two facts may well be
coincidence (the disk and the errors that is). We have now tried 2 replacement Exabytes both of which gave 'Uncorrectable media errors' and failed to work. Our second Exabyte initially continued to work Ok, but now this has started producing 'Uncorrectable media errors' aswell.
I have taken out the 1.6 Gbyte drive and the system now only has one Exabyte (the one which broke(?) second).This still fails to backup ok.
Any help/advice would be greatly appreciated. Does anyone know of any similar problems. Will these systems only support one firmware revision in Exabytes? The engineer seemed to thing his replacements may have been the wrong revision, but this doesn't explain why our second has stopped working. He also had a chat with someone who indicated there may be a problem with the SG trays used to hold one of the Exabytes and 3 disks (including the 1.6 Gbyte one). Does anyone know of such problems. I am beginning to
have doubts about whether there is any problem with the Exabytes but some problem with the I/O card, the tray or the SCSI bus somewhere. But why aren't
the disk affected.
Another fact, probably unrelated is that we are having problems installing 2 more processors
in the system and getting it to come up.
This seems rather difficult to understand when I re-read it but any help would be appreciated
