From mboxrd@z Thu Jan 1 00:00:00 1970 From: aragonx@dcsnow.com Subject: Re: How to boost performance Date: Thu, 17 Jun 2010 15:51:46 -0400 Message-ID: <38599704579ec5d844bada876838dda7.squirrel@www.dcsnow.com> References: <20100617100109.32a20ffa@natsu> <20100617221300.3e30afe0@natsu> <4C1A50FA.50504@stud.tu-ilmenau.de> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Return-path: In-Reply-To: <4C1A50FA.50504@stud.tu-ilmenau.de> Sender: linux-raid-owner@vger.kernel.org To: st0ff@npl.de Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids > Actually, you have not said a word about which controllers you use (for > the drives). Using the wrong controller can drain speed a lot. As from > the kernel benchmarks it seems like neither RAM nor computing power are > the bottlenecks. > > Some SATA-controllers handle "nearly parallel" writes to multiple drives > better than others. SiI products for example have a noticeable drop-off > for each disk you add. Pretty late Intels nearly show no impact of many > disks in parallel. So maybe that could be the topic you should be > after. (And maybe a lspci could help :) > > Stefan Hi Stefan, Here is the output of lspci. There are 5 disks on the ATI controller. Four of them are part of the RAID. The last disk is on the JMicron controller which is a PCIE-1x card. I can move one more disk to the JMicron controller if you think that would help. Or just purchase a new 4 port controller? lspci|grep SATA 00:11.0 SATA controller: ATI Technologies Inc SB700/SB800 SATA Controller [IDE mode] 02:00.0 SATA controller: JMicron Technologies, Inc. 20360/20363 Serial ATA Controller (rev 03) --- Will Y. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.