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Re: Backup to Tape Incomplete

From: "Phillip Smith" <phillip(dot)smith(at)weatherbeeta(dot)com(dot)au>
Cc: <pgsql-admin(at)postgresql(dot)org>
Subject: Re: Backup to Tape Incomplete
Date: 2008-02-27 02:54:22
Message-ID: 01e901c878ec$0df95c40$9b0014ac@wbaus090 (view raw, whole thread or download thread mbox)
Lists: pgsql-admin
>> What would the correct syntax be for that - I can't figure out how to 
>> make tar accept stdin:

> I don't think it can.  Instead, maybe dd with blocksize set equal to the
tape drive's required blocksize would do?  You'd have to check what options
> dd version has for padding out the last partial block. Padding with spaces
should work fine, not totally sure if nulls would be OK.

I don't think it can either, which kind of makes sense. Tar is an archiving
utility to create an archive of files; not to create an archive of the
contents of files. Subtle difference, but makes sense. If I created a tar
archive from the stream coming out of tar, what would be listed when I did
'tar tvf /dev/st0'?

I think I'll hack the backup to output it to a temp file, then tar that file
to tape.

At the very least:



/usr/local/bin/pg_dump $DBNAME > $TMPFILE
/bin/tar cvf $TAPE_DRIVE --label="$TMPFILE" $TMPFILE
/bin/rm -f $TMPFILE

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Subject: Re: Backup to Tape Incomplete
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