Handling multiple nodes failure

Usually, auto recovery must be enabled in an FPO cluster to protect data from multiple node failures. Set mmchconfig restripeOnDiskFailure=yes -N all.

However, if one file system has only two failure groups for metadata or data with default replica two, or if one file system has only 3 failure groups for metadata or data with default replica 3, auto recovery must be disabled (mmchconfig restripeOnDiskFailure=no -N all) in IBM Storage Scale 4.1.x, 4.2.x and 5.0.0. The issue is fixed in IBM Storage Scale 5.0.1 and later.

Usually, if the concurrent failed nodes are less than maxFailedNodesForRecovery, auto recovery will protect data against node failure or disk failure. If the concurrent failed nodes are larger than maxFailedNodesForRecovery, auto recovery exits without any action and the administrator has to take some actions to recover it.