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SCSI buses work fine at full speed until they hit a problem and then the scsi bus resets and comes back slower than before. It continues to do this until transmission problems disappear. The logic here is that buses running at high speed have more chance of collisions. So the bus resets itself and then drops the bus speed to avoid collisions, and does this until collisions disappear.
So if you've replaced the disk and your still getting scsi bus resets then try;
powering off the server and then pull all plugs from it for a few minutes this will completely reset the scsi bus.
check all cables and re-seat them a bad
Check termination and make sure termination is correct for the bus speed you require.
Only disconect cables when the server is powered off, do not break the scsi bus while it's up and running.
This will eventually fry the scsi card so only remove terminators and cables when the server's powered off.
Also you could drop down to the ok prompt and do a probe-scsi-all and see if you can see any problems from there.