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Re: Map a disk LBA to filename?

To: Michal Soltys <nozo@xxxxxxxxxxxxxx>, david@xxxxxxxxxxxxx, xfs@xxxxxxxxxxx
Subject: Re: Map a disk LBA to filename?
From: Carsten Aulbert <carsten.aulbert@xxxxxxxxxx>
Date: Tue, 28 Oct 2008 08:11:46 +0100
In-reply-to: <20081027233516.GG4985@disturbed>
References: <4905A3FB.6080709@aei.mpg.de> <20081027114945.GE4985@disturbed> <4905B48A.8010108@aei.mpg.de> <4905BC13.3030402@drutsystem.com> <20081027233516.GG4985@disturbed>
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Hi Dave et al

Dave Chinner wrote:

> Blockget - yes it will. It just does the traversal internally to
> build the mapping. With large filesystems xfs_db can run out of
> memory building the mapping, which is why I've used the
> explicit traverse+xfs_bmap method in the past....

How expensive is this operation (rule of thumb)? We will mostly use this
on compute nodes where the partition is 500-750 GB large and the node
has 8 GB of memory. For the simple test where I apparently hit thin air
I have not seen anything bad in terms of memory consumption.

Cheers

Carsten


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