From mboxrd@z Thu Jan 1 00:00:00 1970 From: Justin Piszcz Subject: Re: RAID 5 throughputs Date: Sun, 20 Aug 2006 04:37:22 -0400 (EDT) Message-ID: References: <3a1eedb70608191046o7dd207bfp15f02e90b297b1a9@mail.gmail.com> <3a1eedb70608191958u2a6af61er36e01ee7d233998a@mail.gmail.com> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Return-path: In-Reply-To: <3a1eedb70608191958u2a6af61er36e01ee7d233998a@mail.gmail.com> Sender: linux-config-owner@vger.kernel.org To: jassduec@gmail.com Cc: linux-admin@vger.kernel.org, linux-config@vger.kernel.org, linux-scsi@vger.kernel.org List-Id: linux-scsi@vger.kernel.org On Sat, 19 Aug 2006, jassduec@gmail.com wrote: > Yeah, infact it is in a PCI-X slot @66Mhz. > > On 8/19/06, Justin Piszcz wrote: >> >> >> 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. >> >> > What speeds are you currently seeing, r/w? Have you tried making a 3-drive raid5 and increasing it by 1 drive at a time to see if there is any difference in speed? Justin.