From owner-freebsd-amd64@FreeBSD.ORG Tue Mar 20 15:03:58 2007 Return-Path: X-Original-To: freebsd-amd64@freebsd.org Delivered-To: freebsd-amd64@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 2580716A406 for ; Tue, 20 Mar 2007 15:03:58 +0000 (UTC) (envelope-from V.Konrad@lse.ac.uk) Received: from exic4.lse.ac.uk (exic4.lse.ac.uk [158.143.217.121]) by mx1.freebsd.org (Postfix) with ESMTP id BA18913C4B0 for ; Tue, 20 Mar 2007 15:03:57 +0000 (UTC) (envelope-from V.Konrad@lse.ac.uk) Received: from exic6.lse.ac.uk ([158.143.216.123]) by exic4.lse.ac.uk with Microsoft SMTPSVC(5.0.2195.6713); Tue, 20 Mar 2007 14:52:49 +0000 Received: from whirpool.lse.ac.uk ([158.143.201.19]) by exic6.lse.ac.uk with Microsoft SMTPSVC(5.0.2195.6713); Tue, 20 Mar 2007 14:52:49 +0000 Date: Tue, 20 Mar 2007 14:51:53 +0000 From: vladimir konrad To: freebsd-amd64@freebsd.org Message-ID: <20070320145153.53f83eea@whirpool.lse.ac.uk> In-Reply-To: <45FFDF5A.3050701@wp.pl> References: <45FE7615.3090606@icyb.net.ua> <45FFDF5A.3050701@wp.pl> Organization: lse X-Mailer: Claws Mail 2.8.1 (GTK+ 2.6.4; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 20 Mar 2007 14:52:49.0830 (UTC) FILETIME=[6E03DC60:01C76AFF] Subject: Re: SATA RAID: 3ware vs. Promise X-BeenThere: freebsd-amd64@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Porting FreeBSD to the AMD64 platform List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Mar 2007 15:03:58 -0000 i know this is about different promise controller to mine (and also under different operating system) but here is my experience. i am using promise ex8350 under debian linux (sarge) and the 2.6.20.1 kernel (one >2TB raid 6 array). one problem i am experiencing that it cannot sustain write performance. if i do: cat /dev/zero > /directory-on-the-raid-conntroller/out.tmp the write speed is ok to begin with but after about 20 seconds it drops to about 1MB/s. if i do the same on different machine (with software raid 5), it will keep going at around 20MB/s (this one is a slow box). the last message i sent to promise support on 7 march 2007 (with more information, like bios, firmware versions and such) is still unanswered (i hate that). it could be driver/firmware/bios settings or incompatibility but as promise did not respond to the last query, i cannot tell. personally, given a chance i would try something else then promised stuff next time... vlad