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>
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[-- Attachment #1 --] 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 FreeBSD u0216.nshq.netstream.com 6.2-RELEASE FreeBSD 6.2-RELEASE #0: Wed Oct 31 14:53:00 CET 2007 root@u0216.nshq.netstream.com:/usr/obj/usr/src/sys/SMPPAEQUOTA i386 => 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 -- 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 [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFHMF3kuL75KpiFGIwRApMAAJ47e9Vtx5WDrhFYz0TU2/00pyoTYACg1PD5 F+Ii3B6ZjEIom7/KS29Xyc4= =3bQz -----END PGP SIGNATURE-----
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