[Lustre-discuss] Performance parameters

Mark Seger
Fri, 06 Jun 2008 15:14:26 -0000

Is this writing to a single OST or mutliple ones?  If multiple ones I''d
at least test each OST separately just to make sure one of them isn''t
slowing them all down.
Have you verified your interconnect is functioning correctly?
-mark

Enrico Morelli wrote:
> On Fri, 06 Jun 2008 10:52:17 -0400
> "Brian J. Murrell" <Brian.Murrell at Sun.COM> wrote:
>
>
>> On Fri, 2008-06-06 at 16:45 +0200, Enrico Morelli wrote:
>>
>>> Dear all,
>>>
>>> which are the parameters that I can set to improve the
>>> lustre performance?
>>>
>>> Because I have very worse performance using lustre 1.6.4.3.
>>> An ''ls'' on a directory containing 1000 files gets
30s (on a NFS
>>> filesystem the same ''ls'' gets 0.3s)
>>>
>>> The same for a file creation/copy.
>>> On lustre:
>>> # time dd if=/dev/zero of=test.txt bs=1k count=1024000
>>>
>>                                      ^^^^^
>> Try increasing the block size to 1M.
>>
>
> On lustre:
>  time dd if=/dev/zero of=test.txt bs=1M count=1024
> 1024+0 records in
> 1024+0 records out
>
> real    0m21.260s
> user    0m0.000s
> sys     0m1.600s
>
> On NFS:
> time dd if=/dev/zero of=test.txt bs=1M count=1024
> 1024+0 records in
> 1024+0 records out
>
> real    0m2.561s
> user    0m0.006s
> sys     0m1.698s
>
>
>
>> What interconnect are you using between your client and servers?
>>
>>
>
> Its has a giganet nic card (are new HP DL 380/360G5) interconnected
> through a switch HP Procurve using network cable class 7 (1 mt
> length). I can transfer files via network at 30MB/s.
>
>
>> b.
>>
>>
>
>
>