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Re: Backup to Tape Incomplete

From: "Phillip Smith" <phillip(dot)smith(at)weatherbeeta(dot)com(dot)au>
To: <pgsql-admin(at)postgresql(dot)org>
Subject: Re: Backup to Tape Incomplete
Date: 2008-02-27 03:38:49
Message-ID: 01fb01c878f2$44149f00$9b0014ac@wbaus090 (view raw, whole thread or download thread mbox)
Lists: pgsql-admin
Sorry Steve, I missed the "reply all" by 3 pixels :)

> > > tar -cf -
> > > 
> > > the '-f -' says take input.
> > 
> > That would be to write to stdout :) I can't figure out how to accept
> > from stdin :(
> > 
> > -f is where the send the output, either a file, a device (such as
> > tape) or stdout (aka '-')
> Not quite. tar cf - will pipe to stdout, but tar xf - will pipe from 
> stdin.

Yes, true; my head was in "tar c" mode :)

> For the OP's problem, I'd try piping through dd as a file buffer, and 
> run sync on completion. Is there a /dev/rst0, like on some of the old 
> unixes (doesn't look like it after checking my CentOS 4 server)? The 
> difference was that rst0 was unbuffered, and st0 was buffered. Either 
> way, the sync may help.

There's no /dev/rst0 block device, but I'm more familiar with tar than dd,
so I think I'll just rewrite the script to tar to a temp file first :)

Do we think this is a Postgres problem, a Linux problem or a problem
specific to my hardware setup? Was I wrong to think that I should be able to
stream directly from pg_dump to /dev/st0? I would have thought it *should*
work, but maybe I was wrong in the first place with that?

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Subject: Re: Backup to Tape Incomplete
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Subject: Re: Backup to Tape Incomplete

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