From owner-freebsd-hackers@FreeBSD.ORG Mon May 21 09:43:10 2007 Return-Path: X-Original-To: freebsd-hackers@freebsd.org Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 48B5316A400 for ; Mon, 21 May 2007 09:43:10 +0000 (UTC) (envelope-from nico-freebsd-hackers@schottelius.org) Received: from denkbrett.schottelius.org (natgw.netstream.ch [62.65.128.28]) by mx1.freebsd.org (Postfix) with ESMTP id 0C23F13C458 for ; Mon, 21 May 2007 09:43:07 +0000 (UTC) (envelope-from nico-freebsd-hackers@schottelius.org) Received: by denkbrett.schottelius.org (Postfix, from userid 1000) id A47D25B33A; Mon, 21 May 2007 11:24:43 +0200 (CEST) Date: Mon, 21 May 2007 11:24:43 +0200 From: Nico -telmich- Schottelius To: freebsd-hackers@freebsd.org Message-ID: <20070521092443.GC1101@schottelius.org> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="2JFBq9zoW8cOFH7v" Content-Disposition: inline User-Agent: echo $message | gpg -e $sender -s | netcat mailhost 25 X-Unix-Info: http://unix.schottelius.org/ X-Netzseite: http://nico.schottelius.org/ X-System-Info: denkbrett running Linux 2.6.21-denkbrett on i686 Subject: disk i/o problems X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 May 2007 09:43:10 -0000 --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--