Recovering and promoting a file system

Replication and Disaster Recovery Administration Guide for Hitachi NAS Platform

Part Number
  1. From the File System Versions page, select the "Recover File System To Version" option and then click "Promote the file system to a normal file system (and, optionally, mount as read-write or read-only)" to display the Recovery File System page.
  2. In step 2, Recover file system to version created at, on the Recover File System page, verify that the file system version, the snapshot name, and the snapshot source are correct.
  3. In step 3, Promote file system 'name' and, select one of the following mount options for the recovered file system:
    • mount read write
    • mount read only
    • do not mount (selecting this option disables the "Recover access points" option - no access points are moved)
  4. In step 4, Recover access points, fill in the check boxes to specify which types of file system access points to recover. Leave the check boxes empty to specify not to recover SMB shares or NFS exports for the recovered file system.
    • shares
    • exports
      For NFS exports, when promoting a replication target file system on the same EVS as the original source file system, there are two additional options to determine which file system the NFS clients will access after the recovery process:
      • Clients will continue to access source file system

        Enable this option so that the exports that are recovered on the target file system are named <export name>_<task id> to avoid any conflicts with <export name> on the source. Both file systems will have their own set of exports.

      • Clients will access target file system without interruption

        Enable this option so that exports are moved from the source file system to the target without the need to remount NFS v2/3 clients. The source file system will no longer have the recovered exports assigned to it.

  5. Click next to display the Recover File System Confirmation page.
  6. Verify the file system recovery settings, and click OK to proceed with the file system recovery, and display the File System Recovery Report page.
  7. Monitor the file system recovery.

    The following table describes the fields in this page:

    Field/Item Description
    File System Details Display the name of the currently selected EVS and file system, along with its status.
    Recovery Details Displays the progress of the current or last run recovery, and status of the recovery.
    Progress Displays the progress of the current or last run recovery, including start and end times.
    Request Summary Displays the recovery options in use, including the name of the snapshot used for rollback and the share/export handling options.
    Source File System "Transfer Access Point" Setting After Object Replication completes, it promotes the file system to a normal file system on the target EVS. That is, Object Replication transfers the access point to the target file system. By default, it uses the source file system.
    Recovery Statistics Displays NFS Exports and SMB Shares import statistics.
    abort Stops the active recovery operation.
    View Log Opens the File System Recovery Report Log page.

    Use your browser’s back button to return to the previous page, or click abort to abort an active recovery operation.

After the file system has been recovered, and is "live," you may want to create a replication policy and schedule to replicate the new primary file system and use the old primary file system as the replication target.