[Lustre-discuss] Lustre and loop devices

Gabriele Paciucci paciucci at gmail.com
Wed Jun 16 00:48:54 PDT 2010


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
>> ------------------------------------------------------------------------
>>
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>>
>>      
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>    


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

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