On Wednesday 10 September 2008 13:41:18 andrew holway wrote: > >From the Lustre manual:- > > With OST servers it is possible to have a load-balanced active/active > configuration. > Each node is the primary node for a group of OSTs, and the failover > node for other > groups. To expand the simple two-node example, we add ost2 which is primary > on nodeB, and is on the LUNs nodeB:/dev/sdc1 and nodeA:/dev/sdd1. This > demonstrates that the /dev/ identity can differ between nodes, but both > devices must map to the same physical LUN. In this type of failover > configuration, you can > mount two OSTs on two different nodes, and format them from either node. > With failover, two OSSs provide the same service to the Lustre network in > parallel. In case > of disaster or a failure in one of the nodes, the other OSS can > provide uninterrupted > filesystem services. > For an active/active configuration, mount one OST on one node and another > OST on the other node. You can format them from either node. > > Anyone done this on a production system?
Yes, sure we do this all the time. > > Experiances? Comments? You should use either careful manual failover or heartbeat + stonith to prevent accidental double mounts. Usually we have a setup like this: http://www.pci.uni-heidelberg.de/tc/usr/bernd/downloads/lustre/MDS.jpg Cheers, Bernd -- Bernd Schubert Q-Leap Networks GmbH _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
