[Lustre-discuss] Performance parameters

Enrico Morelli
Fri, 06 Jun 2008 15:21:46 -0000

On Fri, 06 Jun 2008 11:14:26 -0400
Mark Seger <Mark.Seger at hp.com> wrote:

> 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.

The OSTs are four but are in the same server. I have used four
partition, on the same server, to create a single lustre filesystem. So
I don''t know how run a test in each OST.

> Have you verified your interconnect is functioning correctly?

Yes, all works fine.

> -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.
> >>
> >>
> >
> >
> >
>


--
-------------------------------------------------------------------
       (o_
(o_    //\  Coltivate Linux che tanto Windows si pianta da solo.
(/)_   V_/_
+------------------------------------------------------------------+
|     ENRICO MORELLI         |  email: morelli at CERM.UNIFI.IT       |
| *     *       *       *    |  phone: +39 055 4574269             |
|  University of Florence    |  fax  : +39 055 4574253             |
|  CERM - via Sacconi, 6 -  50019 Sesto Fiorentino (FI) - ITALY    |
+------------------------------------------------------------------+