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.
I realize there are a lot of components to this and it may not be
appropriate for the DRBD mailing list - if so, just tell me to go
away :)
Any thoughts appreciated!
--
Matth
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