From owner-freebsd-isp Thu Jun 11 05:10:36 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id FAA00621 for freebsd-isp-outgoing; Thu, 11 Jun 1998 05:10:36 -0700 (PDT) (envelope-from owner-freebsd-isp@FreeBSD.ORG) Received: from freefall.pipeline.ch (freefall.pipeline.ch [195.134.128.40]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id FAA00592 for ; Thu, 11 Jun 1998 05:10:16 -0700 (PDT) (envelope-from andre@pipeline.ch) Received: from pipeline.ch ([195.134.128.41]) by freefall.pipeline.ch (Netscape Mail Server v2.02) with ESMTP id AAA233; Thu, 11 Jun 1998 14:08:59 +0200 Message-ID: <357FC8EF.C5B5CD8F@pipeline.ch> Date: Thu, 11 Jun 1998 14:09:19 +0200 From: "IBS / Andre Oppermann" Organization: Internet Business Solutions Ltd. (AG) X-Mailer: Mozilla 4.03 [en] (WinNT; U) MIME-Version: 1.0 To: "Andras Tudos - Computronic, C3" CC: isp@FreeBSD.ORG, marci@c3.hu Subject: Re: file system performance References: <3.0.5.32.19980611000210.00a868b0@computronic.hu> <3.0.5.32.19980611124654.00aad210@computronic.hu> <3.0.5.32.19980611135125.00a36240@computronic.hu> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-isp@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Andras Tudos - Computronic, C3 wrote: > > At 13:17 98.06.11 +0200, you wrote: > > > >What type of RAID do you have (I assume RAID 5)? > >Is the CMD5440 an external RAID controller or internal? > > > RAID5. External. (Backend PC has an Adaptec UW SCSI controller connected to > the CMD RAID controller with 16Mb of cache, it has 3 UW channels each with > 2x 9Gb IBM UW 7200 drives.) Check out if the CMD controller does write-through (for security reasons, power failure). RAID5 is in general slower on writes than reads. -snip- > >What sits in the queue? Incoming mail? > > > Yes. The local deliveries cannot keep up with the smtp-accept rate at peak > periods. There are lists with hundreds of subscribers from our system and > they generate a huge amount of mail traffic. The problems occur on the > current single server system, but we want the new system to have at least > ten times more performance than the current overloaded server to have > spares for the continuosly increasing traffic (and we would like to develop > other projects instead of having to upgrade our system each month :). Yea ;-) -- Andre Oppermann CEO / Geschaeftsfuehrer Internet Business Solutions Ltd. (AG) Hardstrasse 235, 8005 Zurich, Switzerland Fon +41 1 277 75 75 / Fax +41 1 277 75 77 http://www.pipeline.ch ibs@pipeline.ch To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message