I have one of those IBM drives (I think its the same
model). I was never able to get it to work on my
A3k SCSI.device or WarpDrive.device.
Yet it works fine in one of my PC with an Adaptec
SCSI card.
I know this isn't much help other than to say that
I have found IBM drives to be fussy and just may
not work on the WarpDrive. Actually I'm supprised
you got it to work on the SCSI.device.