linux-kernel - Re: very poor ext3 write performance on big filesystems?

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Message-ID: <20080218155725.GB26622@one.firstfloor.org>
Date:	Mon, 18 Feb 2008 16:57:25 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Theodore Tso <tytso@....edu>, Tomasz Chmielewski <mangoo@...g.org>,
	Andi Kleen <andi@...stfloor.org>,
	LKML <linux-fsdevel@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: very poor ext3 write performance on big filesystems?

On Mon, Feb 18, 2008 at 10:16:32AM -0500, Theodore Tso wrote:
> On Mon, Feb 18, 2008 at 04:02:36PM +0100, Tomasz Chmielewski wrote:
> > I tried to copy that filesystem once (when it was much smaller) with "rsync 
> > -a -H", but after 3 days, rsync was still building an index and didn't copy 
> > any file.
> 
> If you're going to copy the whole filesystem don't use rsync! 

Yes, I managed to kill systems (drive them really badly into oom and
get very long swap storms) with rsync -H in the past too. Something is very 
wrong with the rsync implementation of this.

> Use cp
> or a tar pipeline to move the files.

Are you sure cp handles hardlinks correctly? I know tar does,
but I have my doubts about cp.

-Andi
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