DUMP: Warning - block NNN is beyond the end of DEVICE

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This article is a part of the Troubleshooting collection.

Problem

Dump gives an error like 

DUMP: Warning - block 223391968 is beyond the end of `/dev/rdsk/c2t2d0s3'

and sometimes 

DUMP: bread: dev_seek error: Error 0

Explanation

This can be the result of a corrupt filesystem, but more often it is a result of dump having trouble handling an active filesystem: the filesystem has changed while it was working, and as a result it read invalid data.

See http://www.mail-archive.com/[email protected]/msg27659.html.

Solution

If it happens only now and then, don't worry. Try to not run any programs that do heavy input/output during the backup, if possible.

If it happens frequently, use snapshots, if your OS permits it, to freeze a filesystem in a few seconds, and make a backup of that snapshot.

Or use gnutar instead of ufsdump, which, at least, manages to make a consistent backup of everything that did not change -- files that did change may be inconsistent, and gnutar warns which ones (logfiles that are only appended, are nevertheless consistent).

(Thanks to Paul Bijnens)

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