linux-kernel - Re: [ANNOUNCE] DualFS: File System with Meta-data and Data Separation

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Message-ID: <45D7450F.6090309@tmr.com>
Date:	Sat, 17 Feb 2007 13:10:23 -0500
From:	Bill Davidsen <davidsen@....com>
To:	Jörn Engel <joern@...ybastard.org>
CC:	Juan Piernas Canovas <piernas@...ec.um.es>,
	Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	sfaibish <sfaibish@....com>,
	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [ANNOUNCE] DualFS: File System with Meta-data and Data Separation

Jörn Engel wrote:
> On Fri, 16 February 2007 18:47:48 -0500, Bill Davidsen wrote:
>   
>> Actually I am interested in the common case, where the machine is not 
>> out of space, or memory, or CPU, but when it is appropriately sized to 
>> the workload. Not that I lack interest in corner cases, but the "running 
>> flat out" case doesn't reflect case where there's enough hardware, now 
>> the o/s needs to use it well.
>>     
>
> There is one detail about this specific corner case you may be missing.
> Most log-structured filesystems don't just drop in performance - they
> can run into a deadlock and the only recovery from this is the lovely
> backup-mkfs-restore procedure.
>   
I missed that. Which corner case did you find triggers this in DualFS?
> If it was just performance, I would agree with you.

-- 
bill davidsen <davidsen@....com>
  CTO TMR Associates, Inc
  Doing interesting things with small computers since 1979


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