Hi,
I am experiencing an error situation which gets not detected by the cluster.
I created a 2-node cluster using drbd and want to use ocfs2 on both nodes
simultaneously. (stripped off some monitor/meta stuff)
primitive dlm ocf:pacemaker:controld
primitive o2cb ocf:ocfs2:o2cb
primitive resDRBD ocf:linbit:drbd \
params drbd_resource="r0" \
operations $id="resDRBD-operations"
primitive resource-fs ocf:heartbeat:Filesystem \
params device="/dev/drbd_r0" directory="/SHARED" fstype="ocfs2"
ms msDRBD resDRBD
clone clone-dlm dlm
clone clone-fs resource-fs
clone clone-ocb o2cb
colocation colocation-dlm-drbd inf: clone-dlm msDRBD:Master
colocation colocation-fs-o2cb inf: clone-fs clone-ocb
colocation colocation-ocation-dlm inf: clone-ocb clone-dlm
order order-dlm-o2cb 0: clone-dlm clone-ocb
order order-drbd-dlm 0: msDRBD:promote clone-dlm:start
order order-o2cb-fs 0: clone-ocb clone-fs
The cluster starts up happily. (everything green in crm_gui) but
rt-lxcl9a:~ # drbd-overview
0:r0/0 WFConnection Primary/Unknown UpToDate/DUnknown C r-----
rt-lxcl9b:~ # drbd-overview
0:r0/0 StandAlone Primary/Unknown UpToDate/DUnknown r-----
As you can see this is a split brain situation with both nodes having the ocfs2
fs mounted but not in sync --> data loss will happen.
1. How to avoid split brain situations (I am confident that the cross link
using a 10GB cable was never interrupted)?
2. How to resolve this?
Switch cluster in maintenance mode and then follow
http://www.drbd.org/users-guide/s-resolve-split-brain.html ?
3. How to make the cluster aware of the split brain situation? (It thinks
everything is fine)
4. Should the DRBD(OCFS2 setup be maintained outside the cluster instead?
Mit freundlichen Grüßen / Best regards
Martin Konold
Robert Bosch GmbH
Automotive Electronics
Postfach 13 42
72703 Reutlingen
GERMANY
www.bosch.com<http://www.bosch.com>
Tel. +49 7121 35 3322
Sitz: Stuttgart, Registergericht: Amtsgericht Stuttgart, HRB 14000;
Aufsichtsratsvorsitzender: Hermann Scholl; Geschäftsführung: Franz Fehrenbach,
Siegfried Dais;
Stefan Asenkerschbaumer, Bernd Bohr, Rudolf Colm, Volkmar Denner, Christoph
Kübel, Uwe Raschke,
Wolf-Henning Scheider, Werner Struth, Peter Tyroller
_______________________________________________
Linux-HA mailing list
[email protected]
http://lists.linux-ha.org/mailman/listinfo/linux-ha
See also: http://linux-ha.org/ReportingProblems
