Hello,

I've got a Netra t1 105 running 7.1-RELEASE/sparc64.  The box has a
pair of 9GB SCSI drives that I've configured into a geom mirror. 
Recently, I saw in my log:

Feb 20 03:40:25 host kernel: sym0: unexpected disconnect
Feb 20 03:40:43 host kernel: (da1:sym0:0:1:0): READ(10). CDB: 28 0 0
3b b2 2 0 0 20 0
Feb 20 03:40:43 host kernel: (da1:sym0:0:1:0): CAM Status: SCSI Status
Error
Feb 20 03:40:43 host kernel: (da1:sym0:0:1:0): SCSI Status: Check
Condition
Feb 20 03:40:43 host kernel: (da1:sym0:0:1:0): UNIT ATTENTION asc:29,1
Feb 20 03:40:43 host kernel: (da1:sym0:0:1:0): Power on occurred
Feb 20 03:40:43 host kernel: (da1:sym0:0:1:0): Retrying Command (per
Sense Data)
Feb 20 03:44:26 host kernel: sym0: unexpected disconnect
Feb 20 03:46:36 host kernel: (da1:sym0:0:1:0): READ(10). CDB: 28 0 0
3d 43 42 0 0 20 0
Feb 20 03:46:36 host kernel: (da1:sym0:0:1:0): CAM Status: SCSI Status
Error
Feb 20 03:46:36 host kernel: (da1:sym0:0:1:0): SCSI Status: Check
Condition
Feb 20 03:46:36 host kernel: (da1:sym0:0:1:0): UNIT ATTENTION asc:29,1
Feb 20 03:46:36 host kernel: (da1:sym0:0:1:0): Power on occurred
Feb 20 03:46:36 host kernel: (da1:sym0:0:1:0): Retrying Command (per
Sense Data)
Feb 20 03:46:36 host kernel: sym0:1:control msgout: 80 20 3 d.
Feb 20 03:46:36 host kernel: (da1:sym0:0:1:0): READ(10). CDB: 28 0 0
3d 43 42 0 0 20 0
Feb 20 03:46:36 host kernel: (da1:sym0:0:1:0): CAM Status: SCSI Status
Error
Feb 20 03:46:36 host kernel: (da1:sym0:0:1:0): SCSI Status: Check
Condition
Feb 20 03:46:36 host kernel: (da1:sym0:0:1:0): UNIT ATTENTION asc:29,1
Feb 20 03:46:36 host kernel: (da1:sym0:0:1:0): Power on occurred
Feb 20 03:46:36 host kernel: (da1:sym0:0:1:0): Retrying Command (per
Sense Data)
Feb 20 03:46:36 host kernel: (noperiph:sym0:0:-1:-1): SCSI BUS reset
detected.
Feb 20 03:46:36 host kernel: (da1:sym0:0:1:0): lost device
Feb 20 03:46:36 host kernel: (da1:sym0:0:1:0): Invalidating pack
Feb 20 03:46:36 host kernel: GEOM_MIRROR: Device gm0: provider da1
disconnected.
Feb 20 03:46:36 host kernel: (da1:sym0:0:1:0): Synchronize cache
failed, status == 0x4a, scsi status == 0x0
Feb 20 03:46:36 host kernel: (da1:sym0:0:1:0): removing device entry
Feb 20 03:46:36 host kernel:
g_vfs_done():mirror/gm0d[READ(offset=402800640, length=16384)]error =
6
Feb 20 03:46:36 host kernel: (da0:sym0:0:0:0): READ(06). CDB: 8 10 90
b2 10 0
Feb 20 03:46:36 host kernel: (da0:sym0:0:0:0): CAM Status: SCSI Status
Error
Feb 20 03:46:36 host kernel: (da0:sym0:0:0:0): SCSI Status: Check
Condition
Feb 20 03:46:36 host kernel: (da0:sym0:0:0:0): UNIT ATTENTION asc:29,2
Feb 20 03:46:36 host kernel: (da0:sym0:0:0:0): Scsi bus reset occurred
Feb 20 03:46:36 host kernel: (da0:sym0:0:0:0): Retrying Command (per
Sense Data)

So I pull out the SCSI drive in question and replace it with a spare 
and the box doesn't recognize the new drive at all.  No mention of da1
in dmesg whatsoever.  I even did a "camcontrol devlist" and see only
da0.  Could I be dealing with a bad SCSI controller here?



-- 
Regards,
Doug

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