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List:       lustre-discuss
Subject:    [Lustre-discuss] Lustre and loop devices
From:       paciucci () gmail ! com (Gabriele Paciucci)
Date:       2010-06-16 7:48:54
Message-ID: 4C1881E6.50608 () gmail ! com
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If you have a huge number of very small file, is really impressive how 
the loopback device help. But the problem is that you could access only 
from 1 client. The loopback device is a ext2 or ext3 filesystem and you 
can not mount it from more than 1 client!!!

On 06/15/2010 09:53 PM, Kevin Van Maren wrote:
> See https://bugzilla.lustre.org/show_bug.cgi?id=22004
> 
> The work-around is to patch the loopback driver (loop.c) on the client node.
> 
> Kevin
> 
> 
> Sergey Arlashin wrote:
> 
> > Hi!
> > Here
> > http://blogs.sun.com/atulvid/entry/improving_performance_of_small_files
> > is described a very interesting way to improve the performance of
> > small files on a Lustre storage - to mount a loopback file, which is
> > actually placed on the storage with LustreFS. I checked - it really
> > worked. It greatly improved the speed. But in the end of the doc there
> > is a notice:
> > "Under heavy memory loads, Lustre sometime drops pages of IO going to
> > loopback mounted files. This is a known issue is being worked on."
> > What does it actually mean? And how it can affect my data on the storage?
> > And does anybody actually use this method? Is there any way to use it
> > safely?
> > 
> > 
> > -----
> > WBR, Sergey Arlashin
> > ------------------------------------------------------------------------
> > 
> > _______________________________________________
> > Lustre-discuss mailing list
> > Lustre-discuss at lists.lustre.org
> > http://lists.lustre.org/mailman/listinfo/lustre-discuss
> > 
> > 
> _______________________________________________
> Lustre-discuss mailing list
> Lustre-discuss at lists.lustre.org
> http://lists.lustre.org/mailman/listinfo/lustre-discuss
> 
> 


-- 
_Gabriele Paciucci_ http://www.linkedin.com/in/paciucci

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