[Lustre-discuss] Large directory performance

Andreas Dilger andreas.dilger at oracle.com
Fri Sep 10 16:38:38 PDT 2010

On 2010-09-10, at 17:32, Bernd Schubert wrote:
> On Saturday, September 11, 2010, Andreas Dilger wrote:
>> Are you using the DDN 9550s for the MDT?  That would be a bad
>> configuration, because they can only be configured with RAID-6, and would
>> explain why you are seeing such bad performance.  For the MDT you always
> Unfortunately, we failed to copy the scratch MDT in a reasonable time so far. 
> Copying several hundreds of million files turned out to take ages ;) But I 
> guess Mike did the benchmarks for the other filesystem with an EF3010.

Probably for a straight transfer of the MDT, it would be MUCH faster to do a straight "dd" of the filesystem over to the new LUN (assuming it is at least as large as the original LUN).

Cheers, Andreas
Andreas Dilger
Lustre Technical Lead
Oracle Corporation Canada Inc.

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