High Availability
Lustre file system high availability features include a robust failover and recovery mechanism, making server failures and reboots transparent. Version interoperability between successive minor versions of the Lustre software enables a server to be upgraded by taking it offline (or failing it over to a standby server), performing the upgrade, and restarting it, while all active jobs continue to run, merely experiencing a delay while the backup server takes over the storage.
Lustre MDSes are configured as an active/passive pair, while OSSes are typically deployed in an active/active configuration that provides redundancy without extra overhead. Often the standby MDS is the active MDS for another Lustre file system, so no nodes are idle in the cluster.
Read more about this topic: Lustre (file System)
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