From: "Lever, Charles" <Charles.Lever@netapp.com>
Subject: RE: iostat wkB/s numbers during testing
Date: Fri, 14 Feb 2003 08:08:12 -0800
Sender: nfs-admin@lists.sourceforge.net
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Cc: <nfs@lists.sourceforge.net>
To: "Paul Heinlein" <heinlein@cse.ogi.edu>
Errors-To: nfs-admin@lists.sourceforge.net

hi paul-

you can check the list archives for more information,
but the experiences on this list have been that RAID
5 is generally not a hi-performance back-end solution
for Linux NFS servers.

i believe the problem is that NFS servers generate lots
of small writes, and that's something RAID 5 is not
very good at.

i can't answer your specific question about the numbers
you posted.  maybe someone else?

> -----Original Message-----
> From: Paul Heinlein [mailto:heinlein@cse.ogi.edu]=20
> Sent: Friday, February 14, 2003 10:32 AM
> To: nfs@lists.sourceforge.net
> Subject: [NFS] iostat wkB/s numbers during testing
>=20
>=20
> I'm using a dual P-III Compaq DL380 running Red Hat 8.0 to=20
> host a new ATABoy RAID array purchased from Nexsan. It's=20
> connected to our switch via a gig/fiber card based on the=20
> Intel 82542 chipset.
>=20
> The service stack (for lack of a better phrase) is
>=20
> * ATABoy2 -- six-drive RAID-5 array that presents itself to the host=20
>              as a single SCSI device (no multiple LUNs)
> * LVM     -- 1.0.3, one PV, one VG, one LV (so far :-)
> * XFS     -- 1.2pre5
> * NFS     -- v2/v3, UDP only, 80 nfsd threads
> * Samba   -- 2.2.7
>=20
> Last night, I set up six NFS clients and one Linux/smbfs=20
> client to run=20
> iozone against the nfs mount/samba share.
>=20
> I was keeping track of stats using iostat -x on the server.=20
> My typical wkB/s numbers hovered in the 15000 to 19000 range.=20
> Is that sort of result set consistent with what any of you=20
> have seen for Linux-hosted=20
> NFS RAID exports?
>=20
> --Paul Heinlein <heinlein@cse.ogi.edu>
>=20
>=20
>=20
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>=20
>=20
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