From mboxrd@z Thu Jan 1 00:00:00 1970 From: Justin Piszcz Subject: Re: RAID 5 throughputs Date: Sat, 19 Aug 2006 14:00:33 -0400 (EDT) Message-ID: References: <3a1eedb70608191046o7dd207bfp15f02e90b297b1a9@mail.gmail.com> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Return-path: Received: from lucidpixels.com ([66.45.37.187]:8426 "EHLO lucidpixels.com") by vger.kernel.org with ESMTP id S1750739AbWHSSAe (ORCPT ); Sat, 19 Aug 2006 14:00:34 -0400 In-Reply-To: <3a1eedb70608191046o7dd207bfp15f02e90b297b1a9@mail.gmail.com> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: jassduec@gmail.com Cc: linux-admin@vger.kernel.org, linux-config@vger.kernel.org, linux-scsi@vger.kernel.org On Sat, 19 Aug 2006, jassduec@gmail.com wrote: > Hi All, > > I have a storage system with 12 Maxtor 7200 rpm 250GB hard drives in > RAID 5 configuration with one hot spare. Maxtor claims that each drive > is capable of providing 56 MB/s sustained throughput. My host system > is connected to it using 64bit ultra320 Adaptec SCSI card. The host > system has 3.0 GHz pentium 4 (with HT) processor and 4 GB of RAM > running linux kernel 2.6.9. I was wondering what order of "maximum" > sequential read/write, random read/write throughput should i expect > using them. I am using some of the benchmarking tools like Bonnie, > Bonnie++, tiobench, dd, iometer etc. However the results from them > have been very depressing. Theoretically i should be able to achieve a > read sequential throughput close to min(10*56 = 560, 320) = 320 MB/s. > However my results are no way close to it. I was wondering if anybody > can give me some insight of what order of practical throughputs i > should expect using linux and what other factors may be creating > bottlenecks. > > TIA > - > To unsubscribe from this list: send the line "unsubscribe linux-scsi" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Is your 64bit ultra320 card in a 64bit PCI + 66MHZ slot? If not, you will be limited to 133mb/s.