Joanne Cook wrote:
> Hi All,
>
> Thanks for the help with understanding how archives work. I'm now trying to
> stream them straight to tape, but having a few issues with it. If I set
> $Conf{ArchiveComp} = 'gzip' then streaming straight to tape
> ($Conf{ArchiveDest} = '/dev/nst0') fails with the following error:
>
> Executing: /usr/share/backuppc/bin/BackupPC_archiveHost
> /usr/share/backuppc/bin/BackupPC_tarCreate /usr/bin/split serverlanc1 6
> /bin/gzip .gz 0 /dev/nst0 5 *
> Xfer PIDs are now 8987
> Writing tar archive for host serverlanc1, backup #6 to /dev/nst0
> Done: 1093 files, 556537859 bytes, 29 dirs, 0 specials, 0 errors
>
> gzip: stdout: Invalid argument
> Executing: /bin/sh -c -cf /usr/share/backuppc/bin/BackupPC_tarCreate -t -h
> serverlanc1 -n 6 -s \* . | /bin/gzip >> /dev/nst0
> Error: /usr/share/backuppc/bin/BackupPC_tarCreate, compress or split failed
> Archive failed: Error: /usr/share/backuppc/bin/BackupPC_tarCreate, compress
> or split failed
>
> If I set $Conf{ArchiveComp} = 'none' then the job seems to succeed, but when
> I try and see what's on the tape using "tar tvf /dev/nst0" I get the
> following error:
>
> tar: This does not look like a tar archive
> tar: Error exit delayed from previous errors
>
> So- can I either fix it so that I can create gz files on the tape, or is the
> second option actually giving me valid files, in which case how do I read
> them?
Tape drives often have a 'block' size and reads and writes must match or
be an exact multiple of this size. Tar normally defaults to 10k blocks
with padding inserted if needed, and when compressing will fork an extra
process to properly block the output from gzip. Linux usually defaults
to 512 byte blocks. The 'mt' program can show and set the tape block
size. If this is your problem, adding a 'dd' with the obs= option in
the pipeline can control the block size of the writes. Or, if you have
enough temporary disk space, let the backuppc archive process dump to a
file that you can write to tape with dd later.
--
Les Mikesell
[EMAIL PROTECTED]
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