From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: with ECARTIS (v1.0.0; list xfs); Wed, 18 Jul 2007 05:09:24 -0700 (PDT) Received: from cumulus.humilis.net (ookhoi.xs4all.nl [213.84.114.66]) by oss.sgi.com (8.12.10/8.12.10/SuSE Linux 0.7) with ESMTP id l6IC9Kbm000912 for ; Wed, 18 Jul 2007 05:09:21 -0700 Date: Wed, 18 Jul 2007 14:09:22 +0200 From: Sander Subject: Re: Software RAID5 Horrible Write Speed On 3ware Controller!! Message-ID: <20070718120922.GC8029@cumulus> Reply-To: sander@humilis.net References: <20070718112612.GA8029@cumulus> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: xfs-bounce@oss.sgi.com Errors-to: xfs-bounce@oss.sgi.com List-Id: xfs To: Justin Piszcz Cc: Sander , linux-ide-arrays@lists.math.uh.edu, xfs@oss.sgi.com, linux-raid@vger.kernel.org, linux@vger.kernel.org Justin Piszcz wrote (ao): > On Wed, 18 Jul 2007, Sander wrote: >> Justin Piszcz wrote (ao): >>> Its too bad that there are no regular > 4 port SATA PCI-e controllers >>> out there. >> >> Is there a disadvantage to using a SaS controller from for example >> lsi.com ? >> >> http://lsi.com/storage_home/products_home/host_bus_adapters/sas_hbas/index.html >> >> I haven't tried them yet, but on paper it looks like an option, no? > > Hmm that is also a good idea- but I am afraid there could be a > similiar issue where it tries to do weird caching stuff, even when the > drives are in JBOD. Unless they offer a !raid SAS controller that > supports SATA drives. I guess they are cheap enough to try (I haven't yet): PCIe: http://lsi.com/storage_home/products_home/host_bus_adapters/sas_hbas/lsisas3080xr/index.html PCI-X http://lsi.com/storage_home/products_home/host_bus_adapters/sas_hbas/lsisas3081er/index.html All SaS hardware (controllers, chassis, etc) support SATA disks AFAIK. I have good experience with the Supermicro 8-Port SATA Card http://www.supermicro.nl/products/accessories/addon/AoC-SAT2-MV8.cfm But that is PCI-X while you requested PCIe. With kind regards, Sander -- Humilis IT Services and Solutions http://www.humilis.net