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PowerScale OneFS Job Engine
Executive summary Job Engine Multiple jobs processing Job exclusion sets Job Engine management Job Engine orchestration and job processing File system protection and management
Introduction
FlexProtect
MultiScan
AutoBalance
Collect
MediaScan
IntegrityScan
Jobs and OneFS licensing
Job Engine monitoring and reporting Job Engine best practices and considerations Conclusion

FlexProtect

FlexProtect

  • FlexProtect is responsible for maintaining the appropriate protection level of data across the cluster. For example, it ensures that a file that is supposed to be protected at +2 is actually protected at that level.

    Run automatically after a drive or node removal or failure, FlexProtect locates any unprotected files on the cluster and repairs them as quickly as possible. The FlexProtect job includes the following distinct phases:

    • Drive Scan.  FlexProtect scans the cluster’s drives, looking for files and inodes in need of repair. When such file or inode is found, the job opens the LIN and repairs the file or inode and the corresponding data blocks using the restripe process.
    • LIN Verification. Once the drive scan is complete, the LIN verification phase scans the inode (LIN) tree and verifies, reverifies, and resolves any outstanding reprotection tasks.
    • Device Removal. In this final phase, FlexProtect removes successfully repaired drives or nodes from the cluster.

    In addition to FlexProtect, there is also a FlexProtectLin job. FlexProtectLin runs by default when a copy of file system metadata is available on SSD storage. FlexProtectLin typically offers significant runtime improvements over its conventional disk-based counterpart.

    Note: Unlike previous releases, in OneFS 8.2 and later FlexProtect does not pause when there is only one temporarily unavailable device in a disk pool, when a device is smart failed or dead.