From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Clayton Subject: Re: RAID 5 performance issue. Date: Thu, 4 Oct 2007 20:06:50 +0100 Message-ID: <20071004200650.0c8e026f@alpha.digital-domain.net> References: <20071003105321.06943824@zeus.pccl.info> <20071003211910.439ded54@alpha.digital-domain.net> <72dbd3150710031336s331782c3yd0ac7ceda4e81774@mail.gmail.com> <20071004150831.6edbf926@zeus.pccl.info> <20071004153656.16e10f9e@zeus.pccl.info> <20071004160316.5332a370@zeus.pccl.info> <470518CD.10405@maine.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <470518CD.10405@maine.edu> Sender: linux-raid-owner@vger.kernel.org To: Steve Cousins Cc: Justin Piszcz , David Rees , Andrew Clayton , linux-raid@vger.kernel.org List-Id: linux-raid.ids On Thu, 04 Oct 2007 12:46:05 -0400, Steve Cousins wrote: > Andrew Clayton wrote: > > On Thu, 4 Oct 2007 10:39:09 -0400 (EDT), Justin Piszcz wrote: > > > > > > >> What type (make/model) of the drives? > >> > > > The drives are 250GB Hitachi Deskstar 7K250 series ATA-6 UDMA/100 > > A couple of things: > > 1. I thought you had SATA drives > 2. ATA-6 would be UDMA/133 > > The SATA-1 versions of the 7K250's did not have NCQ. The SATA-2 > versions do have NCQ. If you do have SATA drives, are they SATA-1 or > SATA-2? Not sure, I suspect SATA 1 seeing as we've had them nearly 3 years. Some bits from dmesg ata1: SATA max UDMA/100 cmd 0xffffc20000aa4880 ctl 0xffffc20000aa488a bmdma 0xff ffc20000aa4800 irq 19 ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310) ata1.00: ATA-6: HDS722525VLSA80, V36OA63A, max UDMA/100 ata1.00: 488397168 sectors, multi 16: LBA48 ata1.00: configured for UDMA/100 > Steve Andrew