Monitor and Manage ZFS Shadow Migration

The Oracle Solaris 11.4 release provides improved ZFS shadow migration operation with enhancements for better visibility in monitoring migration errors and controlling in-progress migrations.

The following new options are introduced:

• shadowstat -E and shadowstat -e are provided for monitoring migration errors for all migrations or a single migration.
• shadowadm control in-progress migrations. For example, you can identify shadow migration errors of multiple migration operations:

  # shadowstat
                             EST
                      BYTES  BYTES  ELAPSED
  DATASET             XFRD   LEFT   ERRORS  TIME
  pinky/logarchive    16.4M  195M   1       00:01:20
  pinky/dbarchive     4.49M  248M   -       00:00:51
  pinky/logarchive    17.3M  194M   1       00:01:24
  pinky/dbarchive     5.16M  247M   -       00:00:55

  You can identify the specific migration error as follows:

  # shadowstat -E
  pinky/logarchive:
  PATH                          ERROR
  e-dir/socket                  Operation not supported
  pond/dbarchive:
  No errors encountered.

  For example, to cancel the migration as the open socket cannot be migrated:

  # shadowadm cancel pinky/logarchive

For more information, see Managing ZFS File Systems in Oracle Solaris 11.4.

Read the entire article on the upcoming features in Oracle Solaris 11.4 (PDF).