What is the performance of a single disk? Since you used 4 disks, at best, expect 4x the performance of a single disk. > -----Original Message----- > From: linux-scsi-owner@xxxxxxxxxxxxxxx [mailto:linux-scsi- > owner@xxxxxxxxxxxxxxx] On Behalf Of Kadirvel, Selvi > Sent: Thursday, June 02, 2005 10:02 AM > To: linux-scsi@xxxxxxxxxxxxxxx > Subject: Low I/O performance of PERC 4/DC on PE2650 > > We use a PERC 4/DC card on a PowerEdge 2650 server. Connected to > each SCSI bus is a set of 14 physical disks. Using the Dell > Manager utility we create RAID 0 (logical) disk with 4-way stripes > i.e 4 physical disks(across the two channels) and 128K block size. > Using I/O benchmark applications like IOzone, the maximum > throughput obtained is only about 100 MBps. We get lower values > for other stripe sizes and block sizes. Shouldn't this be higher, > considering that the SCSI bus provides 320 MBps throughput ? Does > anyone know how to get better performance? > > Thanks. > -Selvi > > > - > : 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 - : 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
