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

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Message-ID: <47B99E0C.8020706@wpkg.org>
Date:	Mon, 18 Feb 2008 16:02:36 +0100
From:	Tomasz Chmielewski <mangoo@...g.org>
To:	Theodore Tso <tytso@....edu>, Andi Kleen <andi@...stfloor.org>,
	Tomasz Chmielewski <mangoo@...g.org>,
	LKML <linux-fsdevel@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: very poor ext3 write performance on big filesystems?

Theodore Tso schrieb:

(...)

>> What has helped a bit was to recreate the file system with -O^dir_index
>> dir_index seems to cause more seeks.
> 
> Part of it may have simply been recreating the filesystem, not
> necessarily removing the dir_index feature.

You mean, copy data somewhere else, mkfs a new filesystem, and copy data 
back?

Unfortunately, doing it on a file level is not possible with a 
reasonable amount of time.

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.

Also, as files/hardlinks come and go, it would degrade again.

Are there better choices than ext3 for a filesystem with lots of 
hardlinks? ext4, once it's ready? xfs?

-- 
Tomasz Chmielewski
http://wpkg.org
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