what is DIFF_HW in ioscan output

[Byron Myers]

T-600 with failed Seagate ST34371W drive. All Lv's were mirrored from another ST34371W drive. HP replaced it with an ST34371N (yes "N") drive, and ioscan shows the S/W state as "DIFF_HW" for this ST34371N - man on ioscan DIFF_HW means "software found does not match the associated software". What does this mean?

[Robert_Jewell]

The 'software' I beleive is the driver associated with that device. The new drive, according to the model # is a single ended narrow device. The old drive was a wide device (as is all the other drives I assume). The question that I have is the controller and the other drives differential? If so then I am surprised that the system even stayed up. Usually the entire SCSI bus hangs and hangs or crashes the system. I would have the drive removed and replaced with a drive of the same interface type. The only explanation I can offer on the DIFF_HW is that the system expects a differential drive when if fact there is a SE drive there. Not sure on that last part.

-Bob

[Patrick Wallek · Accepted solution]

This page should answer your question about the meaning of DIFF_HW:
http://us-support2.external.hp.com/cki/bin/doc.pl/sid=c08d3d8e1a35dd476d/screen=ckiSearchResults

Basically you need to get HP out to replace the drive with one that is the CORRECT model. As far as I know there should not be any mix of drives with the N and W models.

Here is the spec page from Seagate for the ST34371W:
http://www.seagate.com/support/disc/specs/scsi/st34371w.html

Here is the spec page from Seagate for the ST34371N:
http://www.seagate.com/support/disc/specs/scsi/st34371n.html