Why is are my backups failing?

My backups have run smoothly for months... last night they failed.  I get this message in my backup log:

DUMP: NEEDS ATTENTION: Cannot open `web17:/dev/rmt/0n'.  Do you want to retry the open?: ("yes" or "no")   DUMP: The ENTIRE dump is aborted.
Backup of file system / failed

Any Ideas why?  Resolution?

rwpulliamAsked:
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moduloConnect With a Mentor Commented:
PAQed, with points refunded (500)

modulo
Community Support Moderator
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fim32Commented:
did you try it manually today?  did it error out the same way?

do you potentially have multiple hosts trying to dump at the same time?
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rwpulliamAuthor Commented:
Same problem manually running backup script as root. Root cron runs it each night.

Local dump to tape drive /dev/rmt/0n... no multiple hosts.
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fim32Commented:
oic.

how often do you change tapes?  (are you at the end of this one)

are there other messages in /var/adm/messages or /var/log/syslog? (if there were a scsi problem, they would show up there)
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rwpulliamAuthor Commented:
additonal info....

tape drive has tape and is working OK:

# mt status
HP DDS-3 4MM DAT tape drive:
   sense key(0x6)= Unit Attention   residual= 0   retries= 0
   file no= 0   block no= 0
# mt fsf 1
# mt rewind
# mt status
HP DDS-3 4MM DAT tape drive:
   sense key(0x0)= No Additional Sense   residual= 0   retries= 0
   file no= 0   block no= 0

It has somthing to do with root opening the raw device file... /dev/rmt/0n.  
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rwpulliamAuthor Commented:
Nothing interesting in /var/adm/messages... just checked last 24 hours.
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rwpulliamAuthor Commented:
last mail to root was on march 7th.... no info there either.  HMMMmmmm?  Need backup to run tonight.
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rwpulliamAuthor Commented:
Changed password on root & sys and WALA!

Backing up file system " / " started at 02:10:26 PM
  DUMP: Writing 32 Kilobyte records
  DUMP: Date of this level 0 dump: Wed Apr 14 14:10:28 2004
  DUMP: Date of last level 0 dump: the epoch
  DUMP: Dumping /dev/rdsk/c0t0d0s0 (hqprdweb17:/) to /dev/rmt/0n.
  DUMP: Mapping (Pass I) [regular files]
  DUMP: Mapping (Pass II) [directories]
  DUMP: Estimated 4083034 blocks (1993.67MB).
  DUMP: Dumping (Pass III) [directories]
  DUMP: Dumping (Pass IV) [regular files]
  DUMP: 57.57% done, finished in 0:07
  DUMP: 4083006 blocks (1993.66MB) on 1 volume at 1763 KB/sec
  DUMP: DUMP IS DONE
  DUMP: Level 0 dump on Wed Apr 14 14:10:28 2004
 
Backups are ow nrunning.  Not sure which account did the trick.  I had to su to root before I chaged root's passwd so I think it was probably the sys account.

Questions:

Can the sys account expire/get locked out?

Does sys have any connection to the cron facility?

Is this REALLY the solution, or did I just get lucky?
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fim32Commented:
i suppose it's possible... but the sys user shouldn't have a password!

if you haven't seen an email since march 7th, is it possible that there was a hung backup process that was tying up the tape device?
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CadburyKatCommented:
Probably better to run backups as root.  sys is for data collection.
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ahoffmannCommented:
> .. `web17:/dev/rmt/0n' ..
tells me that the tape is on a remote machine: web12
So testing local to fix the problem sounds like barking up the wrong tree

Is web17 reachable?
Id the tape mounted there?
Cann you acces the tape from web17 itself?
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ahoffmannCommented:
beside my typos,  I don't see a reason for refund ;-)
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liddlerCommented:
>> Changed password on root & sys and WALA!
because original problem was solved by changing password, it was supplemental questions that drifted
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ahoffmannCommented:
oops, missed that comment. Agreed.
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