On Thu, Sep 17, 2009 at 7:36 PM, Matthew Ingersoll <[email protected]>wrote:
> I'm testing a 2 node primary/primary drbd setup but had a few concerns > related to the use of md for raid0 striping. The setup is as follows: > > Each node runs two drbd devices in a primary/primary setup. These devices > are then striped using the mdadm utility. From there, logical volumes are > setup using LVM (I'm running ais + clvmd to sync the nodes). The following > output should explain most of this (identical on node00 and node01): > > r...@node00:~# cat /proc/mdstat > Personalities : [raid0] > md0 : active raid0 drbd1[1] drbd0[0] > 117190272 blocks 64k chunks > > r...@node00:~# pvs -a > PV VG Fmt Attr PSize PFree > /dev/md0 san0 lvm2 a- 111.76G 31.76G > > > From there, logical volumes are created and shared via iscsi. Doing > round-robin tests on iscsi has not shown any corruption yet (this means i'm > reading/writing to both node00 and node01). My main concern is the striping > portion and what is actually going on there. I also tested the striping > using only LVM - this appears to work fine too. > > And what about instead do somthing like this: - sda and sdb on both nodes - raid0 on both nodes so that on eac node you have one md0 device - only one drbd resource based on md0 on both - use drbd0 device as PV for your VG - add clvmd to your cluster layer (you need cman too for clvmd) I'm doing it but only with one disk per node
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