From owner-freebsd-questions@FreeBSD.ORG Wed Jun 17 12:01:29 2009 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id D34BA10656BD for ; Wed, 17 Jun 2009 12:01:29 +0000 (UTC) (envelope-from matej.serc@gmail.com) Received: from mail-fx0-f225.google.com (mail-fx0-f225.google.com [209.85.220.225]) by mx1.freebsd.org (Postfix) with ESMTP id 3ADD38FC0A for ; Wed, 17 Jun 2009 12:01:29 +0000 (UTC) (envelope-from matej.serc@gmail.com) Received: by fxm25 with SMTP id 25so243716fxm.43 for ; Wed, 17 Jun 2009 05:01:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:date:message-id:subject :from:to:content-type; bh=RNyV44uivCVcROocAWu56zdhTZBlWryNQDKY1hi/PG0=; b=B8cE+PRAAcdw7jEOvapFpi76TlNsWhEzhCg+FdDJIBlPgpu4LKWDY5BSJZUGqU9ft2 SPlZgMjdMJV9bZkVd6dgeblz3APccM3mksHL64avG8BN08yH6FMvJLvV3DL3IvWB3Dy2 q5JL+Kq3g0P0lZiGrcjXE4S3ZTdEL2VKNGYYo= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; b=Yb4HzcgEJaBMK3DaOJPEdiIJ5hxsVebBOsAY6Hfpd6Gy7+NgQS3bhrs4fwZaJ9Lciq VHkFI8eDNFMGk19S2G0ck1r3RKP6hyhXCIqCmD2ZkzRTbKdbblMo9kphO6qxszEIKD1H vMjb7U6MTSiryas3PjpePhCpbTH6pGFPhWIuM= MIME-Version: 1.0 Received: by 10.204.60.72 with SMTP id o8mr22921bkh.184.1245238552040; Wed, 17 Jun 2009 04:35:52 -0700 (PDT) Date: Wed, 17 Jun 2009 13:35:52 +0200 Message-ID: <497fe93d0906170435l5a3a18ccw2159d99443055122@mail.gmail.com> From: =?windows-1252?Q?Matej_=8Aerc?= To: freebsd-questions@freebsd.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Subject: Very slow disk speed / mpt0: LSILogic SAS/SATA Adapter X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 17 Jun 2009 12:01:35 -0000 Hi, we have a HP ProLiant server with RAID 0/1 controller onboard. It is detected as mpt0 (I have attached a part of dmesg output at the end of the mail). As reported by some already ( http://www.mail-archive.com/freebsd-performance@freebsd.org/msg02446.html), we are also getting extremely slow write speeds. I read somewhere that there are some improvements which could solve the situation in 7.2 (our system has 7.1 installed and I am currently unable to turn it off and it will stay so for at least 3 months). There are some information that setting hw.mpt.enable_sata_wc=1 solves the write speed (it actually does as I tested!), but I would like to know more about how danger that option is. We are using softupdates and now have this hw.mpt.enable_sata_wc=0, after reading that it might be very dangerous when using sata_wc=1. I am really looking forward to getting more information about this, it is actually driving me nuts. We have a number of other servers and there are no problems with RAID controllers at all. And as I said, I cannot actually turn of this machine and bring it back to reinstall new OS. Thank you very much for your comments and thoughts, Matej The server model is ML110G5. mpt0: port 0xd000-0xd0ff mem 0xfcefc000-0xfcefffff,0xfcee0000-0xfceeffff irq 16 at device 0.0 on pci5 mpt0: [ITHREAD] mpt0: MPI Version=1.5.16.0 mpt0: Capabilities: ( RAID-0 RAID-1E RAID-1 ) mpt0: 1 Active Volume (2 Max) mpt0: 3 Hidden Drive Members (10 Max)