[linux-lvm] disk striping
Stuart D. Gathman
stuart at bmsi.com
Wed May 14 20:49:12 UTC 2008
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).
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
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 at 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.
More information about the linux-lvm