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Date: Fri, 09 Jun 2006 16:04:26 -0400
From: Jeff Garzik <jeff@garzik.org>
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To: Theodore Tso <tytso@mit.edu>, Jeff Garzik <jeff@garzik.org>,
       Matthew Frost <artusemrys@sbcglobal.net>,
       Alex Tomas <alex@clusterfs.com>, Linus Torvalds <torvalds@osdl.org>,
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       ext2-devel <ext2-devel@lists.sourceforge.net>,
       linux-kernel@vger.kernel.org, cmm@us.ibm.com,
       linux-fsdevel@vger.kernel.org
Subject: Re: [Ext2-devel] [RFC 0/13] extents and 48bit ext3
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Theodore Tso wrote:
> On Fri, Jun 09, 2006 at 02:51:55PM -0400, Jeff Garzik wrote:
>> ext3 is already essentially xiafs-on-life-support, when you consider 
>> today's large storage systems and today's filesystem technology.  Just 
>> look at the ugly hacks needed to support expanding an ext3 filesystem 
>> online.
> 
> And what ugly hacks are you talking about?  It's actually quite clean;
> with the latest e2fsprogs, you use the same command (resize2fs) for
> doing both online and offline resizing.

Consider a blkdev of size S1.  Using LVM we increase that value under 
the hood to size S2, where S2 > S1.  We perform an online resize from 
size S1 to S2.  The size and alignment of any new groups added will 
different from the non-resize case, where mke2fs was run directly on a 
blkdev of size S2.

	Jeff