SUMMARY: Badblock on disk

Thanks to J Carlos Castro, Hichael Morton and sysadmin@astro.su.se

All pointed out the hardware error, which demands disk repalcement as a
proactive measure.
We eventually replaced the disk and some data is not vital on other striped
partions, restored
partially from backup. I only meant to say meta devices are configured on the
disk when
i meant "with Disksuite" in the original subject.

More detailed answer from sysadmin@astro.su.se is as follows.

The bad block may be an early warning of impending disk failure. That
argues for replacing the disk at the earliest opportunity. It's a media
(i.e. hardware) error, so fsck alone will not make it go away.

Since it's a SCSI disk, you should be able to use the format utility to
replace the bad block with a spare. If the bad block is on a mirrored
slice, you should be able to do that while the system is running.
For good measure, make sure your backups are as current as possible
before doing this---especially for the striped metadevices. In any
case, schedule a disk replacement sometime soon, before things get
any worse.

----- Original Message -----
  To: sunmanagers@sunmanagers.org
  Sent: Saturday, May 10, 2003 11:31 PM
  Subject: Badblock on disk with Disksuite


  Managers:

  What would be best to resolve following system log message. On a 420R with
2x18G internal disks.
  This shows a bad block on a disk , does it warrant a disk replacement or
fsck on that partition is enough.
   Can not test this as i cannot afford a reboot without a formal action
plan.

  Problem is not all partions on the disk are mirrored. Two other partitions
are striped.

  Error for Command: read(10)                Error Level: Retryable
  Requested Block: 2283904                  Error Block: 283904
  Sense Key: Media Error
  ASC: 0x11 (unrecovered read error), ASCQ: 0x0, FRU: 0x0
  WARNING: /pci@1f,4000/scsi@3/sd@0,0 (sd0):
  Error for Command: read(10)                Error Level: Fatal
  md: d31: read error on /dev/dsk/c0t0d0s4
  WARNING: md: d41: /dev/dsk/c0t0d0s4 needs maintenance

  Any ideas?

  Thanks
  John
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