Date: Mon, 21 May 2007 11:24:43 +0200 From: Nico -telmich- Schottelius <nico-freebsd-hackers@schottelius.org> To: freebsd-hackers@freebsd.org Subject: disk i/o problems Message-ID: <20070521092443.GC1101@schottelius.org>
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--2JFBq9zoW8cOFH7v Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hello everyone, I did some tests on our Dell Poweredge SC 1425, because our new mailserver had one outage (reason unknown) and was onetime running extremly slow. So I took another brand new sc1425 and run http://home.schottelius.org/~nico/unix/freebsd/testdisks.sh on it. The result is that the machine is practically dead, when the script is running. I started the script in a screen, in which also top, gstat, systat -iostat and vmstat -a runs in. I can navigate through the screen, but if I type 'ls' in a open shell it will never return until I stop the testscript. Connecting to the machine via ssh is impossible within this time, existing connections are still there. Configuration of the machine: - 1x dual core 3.2ghz xeon - 2x scsi disks (u320) combined via gmirror to raid1 - RAID bus controller: Adaptec ASC-39320(B) U320 w/HostRAID (rev 10) - mount: /dev/mirror/raid1s1a on / (ufs, local, soft-updates) My question regarding this issue: - it seems not to be normal to me, that a system is practically dead when running some i/o heavy processes and it also does not look to me like a general freebsd issue; what could be the reason for it? - is it possible to choose i/o schedulars in freebsd like linux offers it with sfq/deadline/cbq? - what's the general / normal behaviour of freebsd when doing i/o scheduling? I'll also post a more detailled description about the problem in the other server on -questions in the next minutes. 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 --2JFBq9zoW8cOFH7v 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) iD8DBQFGUWVbuL75KpiFGIwRAifbAKCKknC4Wl4u6g+v7JNCaeopBwz39QCfcFRJ iCzviuvErQOGCggO+IHtHA8= =zYeG -----END PGP SIGNATURE----- --2JFBq9zoW8cOFH7v--
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