[Lustre-discuss] Performance parameters

Enrico Morelli
Fri, 06 Jun 2008 15:47:10 -0000

On Fri, 06 Jun 2008 11:24:28 -0400
"Brian J. Murrell" <Brian.Murrell at Sun.COM> wrote:

> 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?

The server is connected to an MSA60 with 7x500GB SATA HDD in RAID 6.

>
> > 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?

Sorry, sorry, sorry, I''m very tired. I connected directly to the NFS
server :-(((( On a client machine the time is more than 1 minutes.

The problem is that a lot of people told me that ''ls'' required
a lot of
time, a ''cp'' required a lot of time, all operations on lustre
filesystem are very slow. The people that works on lustre has a lot of
files to manage, so testing his directories I found that an
''ls'' require
a lot of time and the same for ''cp'' and ''rm''
operations.

The dd was not a better test to do. Sorry again.

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