linux-ext4 - Re: fsck performance.

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Message-ID: <AANLkTi=VVRRTqmiYYwmru9yAVNTKOD6Xhu8Lookdcyvq@mail.gmail.com>
Date:	Thu, 24 Feb 2011 11:33:34 +0200
From:	Amir Goldstein <amir73il@...il.com>
To:	Rogier Wolff <R.E.Wolff@...wizard.nl>
Cc:	Andreas Dilger <adilger@...ger.ca>, linux-ext4@...r.kernel.org
Subject: Re: fsck performance.

On Thu, Feb 24, 2011 at 11:02 AM, Rogier Wolff <R.E.Wolff@...wizard.nl> wrote:
> On Thu, Feb 24, 2011 at 10:59:23AM +0200, Amir Goldstein wrote:
>
>> That tool is e2image -r, which creates a sparse file image of your
>> fs (only metadata is written, the rest is holes), so you need to be
>> careful when copying/transferring it to another machine to do it
>> wisely (i.e. bzip or dd directly to a new HDD) Not sure what you
>> will do if fsck fixes errors on that image...  Mostly (if it didn't
>> clone multiply claimed blocks for example), you would be able to
>> write the fixed image back onto your original fs, but that would be
>> risky.
>
> I can then run the fsck tests on the image. I expect fsck to find
> errors: I'm using the filesystem when I'm making that image.... It
> won't be consistent.
>

So you probably won't learn a lot from fsck results, unless you only
want to provide memusage/runtime statistic as per Andreas request.

You have the option to use NEXT3 so take a snapshot of your fs,
while it is online, but I don't suppose you would want to experiment
on your backup server.

Amir.
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