On Sat, 19 Aug 2006, jassduec@xxxxxxxxx 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@xxxxxxxxxxxxxxx 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. - To unsubscribe from this list: send the line "unsubscribe linux-config" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
