[Beowulf] Lustre failover

andrew holway andrew at moonet.co.uk
Wed Sep 10 07:41:18 EDT 2008


>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?

Experiances? Comments?

Cheers

Andy
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