[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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