Recoverability considerations

Good file system planning requires several decisions about recoverability. After you make these decisions, GPFS parameters enable you to create a highly available file system with rapid recovery from failures.

At the disk level, consider preparing disks for use with your file system by specifying failure groups that are associated with each disk. With this configuration, information is not vulnerable to a single point of failure. See Network Shared Disk (NSD) creation considerations.
At the file system level, consider replication through the metadata and data replication parameters. See File system replication parameters.

Also, GPFS provides several layers of protection against failures of various types.