What does it mean when a drive decides it is offline?

cbiiisc0: target 1 now wide 1
cbiiisc0: target 1 now synchronous, period=50ns, offset=16
siopng sync: siop_sxfr 30, siop_scntl3 95
sd1 at scsibus0 target 1 lun 0: <IBM, DDYS-T36950N, S93E> SCSI3 0/direct fixed
sd1: drive offline

This is a new 36 gig IBM drive on an Amiga with a CyberStorm Mk III with
wide ultra SCSI. It has been working fine for almost two months.

The other drives work fine.

Thanks,
John Klos