On Wed, 14 May 2008, Jorge Souto wrote: > I use lvm in a mainframe environment, with small ECKD disks (maximum model > 54, aprox. 45 GB). So to create a big volume a I need a lot of disks. I'm > going to create one with 35 physical volumes. I have doubts about striping, > particularly deciding the number of stripes in such case (35 PVs in one > storage array rank -yeah, not good-), and the drawbacks in administration > tasks ( growing and limitations adding pvs to a stripped volume). Idea 1: Make 4 PVs of 8 disks with raid1+0 (create 4 mirror pairs, then stripe the 4 mirrors in each group). Keep the additional 3 disks as spares. Idea 2: Make 7 PVs of 5 disks with raid5 (4 disks with 1 parity). In each case, 4 way striping accelerates read/write by 4. Each case is able to tolerate single disk failures. -- Stuart D. Gathman <stuart@bmsi.com> Business Management Systems Inc. Phone: 703 591-0911 Fax: 703 591-6154 "Confutatis maledictis, flammis acribus addictis" - background song for a Microsoft sponsored "Where do you want to go from here?" commercial. _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/