From owner-aic7xxx@FreeBSD.ORG Wed Mar 14 16:50:56 2007 Return-Path: X-Original-To: aic7xxx@freebsd.org Delivered-To: aic7xxx@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id AC12316A401 for ; Wed, 14 Mar 2007 16:50:56 +0000 (UTC) (envelope-from ibr@radix50.net) Received: from almaty.kz-easy.com (kz-easy.com [85.214.25.173]) by mx1.freebsd.org (Postfix) with ESMTP id 3BA7713C468 for ; Wed, 14 Mar 2007 16:50:55 +0000 (UTC) (envelope-from ibr@radix50.net) Received: from alatau.radix50.net (dslb-088-064-025-021.pools.arcor-ip.net [88.64.25.21]) (authenticated bits=0) by almaty.kz-easy.com (8.13.4/8.13.4/Debian-3sarge3) with ESMTP id l2EGojRr001137 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT) for ; Wed, 14 Mar 2007 17:50:47 +0100 Received: from alatau.radix50.net (localhost [127.0.0.1]) by alatau.radix50.net (8.13.8/8.13.8/Debian-2) with ESMTP id l2EGokMt021411 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT) for ; Wed, 14 Mar 2007 17:50:46 +0100 Received: (from ibr@localhost) by alatau.radix50.net (8.13.8/8.13.8/Submit) id l2EGojWk021410 for aic7xxx@freebsd.org; Wed, 14 Mar 2007 17:50:45 +0100 Date: Wed, 14 Mar 2007 17:50:45 +0100 From: Baurzhan Ismagulov To: aic7xxx@freebsd.org Message-ID: <20070314165045.GA21264@radix50.net> Mail-Followup-To: aic7xxx@freebsd.org References: <20070228204034.GA2379@radix50.net> <45E602B3.2020306@paralan.com> <20070228233314.GA7348@radix50.net> <45E77B30.2090505@paralan.com> <20070302220950.GD7331@radix50.net> <45E8C36C.1020407@paralan.com> <20070314121250.GB2553@radix50.net> <45F7FBA5.4010404@scsiguy.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <45F7FBA5.4010404@scsiguy.com> User-Agent: Mutt/1.5.13 (2006-08-11) X-Spam-Status: No, score=4.3 required=5.0 tests=RCVD_IN_NJABL_DUL, RCVD_IN_SORBS_DUL,RCVD_IN_XBL autolearn=no version=3.0.3 X-Spam-Level: **** X-Spam-Checker-Version: SpamAssassin 3.0.3 (2005-04-27) on almaty.kz-easy.com Subject: Re: Adaptec 2940UW with Fujitsu MAN3184M X-BeenThere: aic7xxx@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Adaptec Device Drivers in FreeBSD and Linux List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Mar 2007 16:50:56 -0000 Hello Justin, On Wed, Mar 14, 2007 at 09:41:57AM -0400, Justin T. Gibbs wrote: > >I've done some tests (hdparm -tT, build the Linux kernel with ccache) > >and have seen that my SATA 7.2k ST3320620AS outperforms U160 10k > >MAN3184M by up to 30%, so I decided not to use it for the rootfs yet. > > Make sure you run a fair test. Most SCSI drives are shipped from the > factory with the write cache set to "write-through". SATA and ATA > drives almost always operate in "write-back" mode. Your 29160 BIOS > should have an option to set the caching mode on a per-target basis. I've enabled the BIOS and set the write-back mode on MAN3184M, no difference in writing /proc/kcore. > If you're system is backed up by a UPS or your FS can handle being > lied to, write-back is fine. Otherwise it's really not a safe option. Oh. Does ext3 handle that? Or do you know filesystems that do? I've googled for that, but the links I've looked at refer to ext3's writeback mode. With kind regards, -- Baurzhan Ismagulov http://www.kz-easy.com/