Date: Tue, 6 Nov 2007 13:28:20 +0100 From: Nico -telmich- Schottelius <nico-freebsd-performance@schottelius.org> To: freebsd-performance@freebsd.org Subject: Performance of disk i/o with 3ware Message-ID: <20071106122820.GA28254@schottelius.org>
next in thread | raw e-mail | index | archive | help
--SLDf9lqlvOQaIe6s
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable
Hello!
I've the problem that sometimes there are many disk waiting processes
(sysctl -n vm.vmtotal), but systat -vmstat shows da0 and da1 busy with
0-10%.
I guess that the disk i/o is at about 100%, but wondering why I see
those strange values.
System Information:
- Disks are attached to 07:01.0 RAID bus controller: 3ware Inc 9550SX SATA-=
RAID
u0216# uname -a =
=20
FreeBSD u0216.nshq.netstream.com 6.2-RELEASE FreeBSD 6.2-RELEASE #0: Wed Oc=
t 31 14:53:00 CET 2007 root@u0216.nshq.netstream.com:/usr/obj/usr/src/sys/S=
MPPAEQUOTA i386
=3D> kernel contains 3ware patches from CVS, marked for inclusion in 6.3,
because we've seen many times a freeze on that system before
- Disks are 10k rpm sata disks.
- Board is a Supermicro X7DB8, processor is a quad core Xeon, E5345@2.33GHz.
Anyone an idea,
a) why systat -vmstat shows so small busy values?
b) how to debug it further?
Sincerly
Nico
--=20
Think about Free and Open Source Software (FOSS).
http://nico.schottelius.org/documentations/foss/the-term-foss/
PGP: BFE4 C736 ABE5 406F 8F42 F7CF B8BE F92A 9885 188C
--SLDf9lqlvOQaIe6s
Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: Digital signature
Content-Disposition: inline
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (GNU/Linux)
iD8DBQFHMF3kuL75KpiFGIwRApMAAJ47e9Vtx5WDrhFYz0TU2/00pyoTYACg1PD5
F+Ii3B6ZjEIom7/KS29Xyc4=
=3bQz
-----END PGP SIGNATURE-----
--SLDf9lqlvOQaIe6s--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20071106122820.GA28254>