From owner-freebsd-questions Wed Oct 27 5:59:20 1999 Delivered-To: freebsd-questions@freebsd.org Received: from freebie.lemis.com (freebie.lemis.com [192.109.197.137]) by hub.freebsd.org (Postfix) with ESMTP id 0A35914EE5 for ; Wed, 27 Oct 1999 05:58:58 -0700 (PDT) (envelope-from grog@freebie.lemis.com) Received: (grog@localhost) by mojave.worldwide.lemis.com (8.9.3/8.6.12) id WAA00766; Tue, 26 Oct 1999 22:31:13 -0400 (EDT) Message-ID: <19991026222942.39556@mojave.worldwide.lemis.com> Date: Tue, 26 Oct 1999 22:29:42 -0400 From: Greg Lehey To: GVB , freebsd-questions@FreeBSD.ORG Subject: Re: question regarding IO References: <4.2.1.19991025143751.017b2af0@abused.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.89i In-Reply-To: <4.2.1.19991025143751.017b2af0@abused.com>; from GVB on Mon, Oct 25, 1999 at 02:48:01PM -0700 WWW-Home-Page: http://www.lemis.com/~grog Organization: LEMIS, PO Box 460, Echunga SA 5153, Australia Phone: +61-8-8388-8286 Fax: +61-8-8388-8725 Mobile: +61-41-739-7062 Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Monday, 25 October 1999 at 14:48:01 -0700, GVB wrote: > I am running a small ISP 100% on FreeBSD. I wanted to add a level of > redundancy to our mail server so I purchased the Raidstation3 kit from DPT > which includes an external 3 bay drive enclosure and a PCI raid > controller. I populated the controller with 64 megs of ram and popped in 3 > Ultra2 10,000rpm Seagate Cheetah drives. I built the raid and mounted the > two partitions as /var/mail and /var/spool/mail. I now get strange > unresponsive timeouts from the machine at random times.. this is what > iostat looks like when the machine is unresponsive, sometimes up to 10 > seconds at a time. This was not happening before installing this RAID so > it leads me to believe that the file system is the problem. > > tty da0 da1 da2 cpu > tin tout KB/t tps MB/s KB/t tps MB/s KB/t tps MB/s us ni sy in id > 0 76 0.00 0 0.00 0.00 0 0.00 64.00 1 0.06 5 0 1 15 79 > > What does the KB/t mean, It's the average size of the transfers. FreeBSD is limited to 128 kB/t, but in practice never goes beyond 64 kB. > it seems that it never gets past 64 and when it hits 64 the machine > becomes unresponsive. This might be a DPT problem. > Any suggestions or pointers would be appreciated. What are the *relevant* lines of your dmesg output? What kind of DPT controller do you have? It may be that it's not handling 64 kB transfers correctly. Greg -- When replying to this message, please copy the original recipients. For more information, see http://www.lemis.com/questions.html Finger grog@lemis.com for PGP public key See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message