linux-kernel - Re: ZFS with Linux: An Open Plea

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Message-ID: <20070416030705.GY32602149@melbourne.sgi.com>
Date:	Mon, 16 Apr 2007 13:07:05 +1000
From:	David Chinner <dgc@....com>
To:	Rik van Riel <riel@...hat.com>
Cc:	"David R. Litwin" <presently42@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: ZFS with Linux: An Open Plea

On Sun, Apr 15, 2007 at 08:50:25PM -0400, Rik van Riel wrote:
> David R. Litwin wrote:
> 
> >>4: ZFS has a HUGE capacity. I don't have 30 exobytes, but I might some
> >>day....
> >
> >ext4 will probably cope with that.  XFS definitely has very high
> >limits though I admit I don't know what they are.
> >
> >XFS is also a few exobytes.
> 
> The fsck for none of these filesystems will be able to deal with
> a filesystem that big.  Unless, of course, you have a few weeks
> to wait for fsck to complete.

Which is why I want to be able to partially offline a chunk of
a filesystem and repair it while the rest is still online.....

> Backup and restore are similar problems.  When part of the filesystem
> is lost, you don't want to have to wait for a full restore.
> 
> Sounds simple?  Well, the hard part is figuring out exactly which
> part of the filesystem you need to restore...
> 
> I don't see ZFS, ext4 or XFS addressing these issues.

XFS has these sorts of issues directly in our cross-hairs.

The major scaling problem XFS has right now is to do with
how long repair/backup/restore take when you have hundreds
of terabytes of storage.

> IMHO chunkfs could provide a much more promising approach.

Agreed, that's one method of compartmentalising the problem.....

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group
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