support quality (Re: dump | restore fails: unknown tape header type 1853384566)

Peter Jeremy peterjeremy at
Thu Mar 26 02:37:02 PDT 2009

On 2009-Mar-25 19:25:28 +1030, Daniel O'Connor <doconnor at> wrote:
>One other thing would be to make absolutely sure that your version of dump & 
>restore are in sync, the are very machine/version dependent.

Actually, they aren't - the archive format is very stable.  (This is a
fairly important requirement - you don't want to suddenly be unable to
restore your backups after an upgrade).  I can restore dumps made on
FreeBSD4.8/i386 and FreeBSD4.9/alpha on a FreeBSD-current/amd64 system
without problems.

It's possible that you might have problems with a backup made using a
very recent dump on a very old restore if you've used filesystem
features that didn't exist when that restore was built.

Peter Jeremy
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 196 bytes
Desc: not available
Url :

More information about the freebsd-fs mailing list