[Lustre-discuss] Performance parameters

[Brian J. Murrell]

On Fri, 2008-06-06 at 17:06 +0200, Enrico Morelli wrote:
> 
> 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

So, about 48MiB/s, yes?  What does your storage backend look like?

> 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

399MiB/s.  Do you believe this?  Does it correlate with the storage
backend on the NFS server and the network interconnect between your NFS
client and NFS server?

> 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.

Is this the same interconnect hardware on your NFS installation?

b.

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