[Lustre-discuss] [Lustre-Performance] Lustre performance on SLES 11 x86-64

udara weerapperuma udaraslt at gmail.com
Fri Oct 30 04:49:48 PDT 2009


Hi All,


I have SLES 11 x86-64  and lustre v 1.8.1.1 installed in it. This use as MDS
and OSS.

/dev/sda3 ----2 GB------ MDT
/dev/sdb2 ----5 GB------ OST1
/dev/sdb3 ----5 GB------ OST2
/dev/sdb5 ----5 GB------ OST3
/dev/sdb6 ----5 GB------ OST4

Then I have 2 clients running on SLES 11 x86-64 and SLES 10 SP2 x86-64 both
has the lustre v 1.8.1.1 installed.
The SLES 10 client gives the same speed for every bs value in dd command (dd
if=/dev/zero of=/lustre/sles10.out bs=1k gives 43 MB/s)
This is same for the every bs value on SLES 10 SP2.

But for the SLES 11 x86-64 client gives only 4 MB/s speed for the small bs
values. (bs=1k )
It gives 45 MB/s for the bs=32k values and up.

I have attached some outputs from the llstat command on both the clients.

Please give me a solution to tune SLES 11 x86-64 server to get 40 MB/s speed
under bs=1k situvation.
tnx,
Udara
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