> I have 4 fiber channel disks, on which I intend to build a logical > volume using lvm. Before creating the logical volume, I run an I/O > test on the disks, which revealed that the disks each would do > 10MBytes/sec I/Os. > > However, when I create a logical volume, spanning all 4 disks using > RAID0, I realize that the transfer rate now drops. Instead > (10 * 4)MB/s, I get something close to 30MB/s. Am I doing something > wrong?!? 10 MB/s ? How are you measuring your data transfer rate? Measured using "hdparm -t", a single Maxtor D740X IDE drive (80GB = GBP£72.00 or USD$113) will shift about 39 MB/s. Bill The contents of this e-mail and any attachments are confidential and may be legally privileged. If you have received this e-mail and you are not a named addressee, please inform us as soon as possible on +44 118 901 2999 and then delete the e-mail from your system. If you are not a named addressee you must not copy, use, disclose, distribute, print or rely on this e-mail. Any views expressed in this e-mail or any attachments may not necessarily reflect those of Tao's management. Although we routinely screen for viruses, addressees should scan this e-mail and any attachments for viruses. Tao makes no representation or warranty as to the absence of viruses in this e-mail or any attachments. Please note that for the protection of our business, we may monitor and read e-mails sent to and from our server(s). Visit our website at http://tao-group.com/ _______________________________________________ linux-lvm mailing list linux-lvm@sistina.com http://lists.sistina.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html