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Date:      Sun, 27 Oct 1996 03:45:26 +0100
From:      Michael Beckmann <petzi@zit.th-darmstadt.de>
To:        hardware@freebsd.org, scsi@freebsd.org
Subject:   SCSI harddisk trouble: MEDIUM ERROR
Message-ID:  <v03007800ae987904fb85@[130.83.63.13]>

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Hello,

since a couple days I'm getting messages from my harddisk like

Oct 27 03:26:58 zit1 /kernel: , retries:2
Oct 27 03:26:58 zit1 /kernel: sd0(ncr0:0:0): MEDIUM ERROR info:3b13fe asc:11,b
Oct 27 03:26:58 zit1 /kernel: sd0(ncr0:0:0):  Unrecovered read error -
recommend reassignment sks:80,32
Oct 27 03:26:58 zit1 /kernel: , retries:1
Oct 27 03:26:58 zit1 /kernel: sd0(ncr0:0:0): MEDIUM ERROR info:3b13fe asc:11,b
Oct 27 03:26:58 zit1 /kernel: sd0(ncr0:0:0):  Unrecovered read error -
recommend reassignment sks:80,32
Oct 27 03:26:58 zit1 /kernel: , FAILURE
Oct 27 03:26:58 zit1 /kernel: sd0(ncr0:0:0): MEDIUM ERROR info:3b13fe asc:11,b
Oct 27 03:26:58 zit1 /kernel: sd0(ncr0:0:0):  Unrecovered read error -
recommend reassignment sks:80,32
Oct 27 03:26:58 zit1 /kernel: , retries:4
Oct 27 03:26:58 zit1 /kernel: sd0(ncr0:0:0): MEDIUM ERROR info:3b13fe asc:11,b
Oct 27 03:26:59 zit1 /kernel: sd0(ncr0:0:0):  Unrecovered read error -
recommend reassignment sks:80,32
Oct 27 03:26:59 zit1 /kernel: , retries:3
Oct 27 03:26:59 zit1 /kernel: sd0(ncr0:0:0): MEDIUM ERROR info:3b13fe asc:11,b
Oct 27 03:26:59 zit1 /kernel: sd0(ncr0:0:0):  Unrecovered read error -
recommend reassignment sks:80,32
Oct 27 03:26:59 zit1 /kernel: , retries:2
Oct 27 03:26:59 zit1 /kernel: sd0(ncr0:0:0): MEDIUM ERROR info:3b13fe asc:11,b
Oct 27 03:26:59 zit1 /kernel: sd0(ncr0:0:0):  Unrecovered read error -
recommend reassignment sks:80,32
Oct 27 03:26:59 zit1 /kernel: , retries:1
Oct 27 03:26:59 zit1 /kernel: sd0(ncr0:0:0): MEDIUM ERROR info:3b13fe asc:11,b
Oct 27 03:26:59 zit1 /kernel: sd0(ncr0:0:0):  Unrecovered read error -
recommend reassignment sks:80,32
Oct 27 03:27:00 zit1 /kernel: , FAILURE

I took the disk out of the system, and checked its configuration. AWRE and
ARRE were set. I thought the disk was supposed to automatically reassign
bad blocks in this configuration ? This seems not to work, the grown defect
list had no entry. I reassigned three blocks manually, which were reported
as being unreadable by fsck. But now I'm getting these errors again.

fsck gave me a decimal block number for the bad block, how can I tell which
block is bad here ? Is there a way to run a disk check under FreeBSD, which
finds (and reassigns) bad blocks ? Is there a good way to reassign blocks
automatically, and avoid the problems that follow these medium errors ?
BTW. This disk has been running over 1 year, 24h a day now.

Cheers,

Michael





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