Comparing plexes of a mirrored aggregate or traditional volume

The plexes of a mirrored aggregate or traditional volume are almost always synchronized. Therefore, there is rarely need to compare the plexes of a mirrored aggregate or traditional volume.

Before You Begin

The mirrored aggregate or traditional volume must be online before you can compare the plexes.

Considerations

Comparing plexes might affect storage system performance.

When comparing the two plexes of a mirrored aggregate or traditional volume, you can choose one of the following options.

Data ONTAP compares plexes without correcting differences. This is the default behavior.
Data ONTAP compares plexes and corrects the differences it finds. To correct differences, specify which plex to correct. The plex is specified as plexnumber (0, 1, and so on).
Attention: This process might use advanced Data ONTAP commands. Consult Technical Support before correcting differences using this option.

Step

To compare the two plexes of a mirrored aggregate or traditional volume, complete the following step.

If...	Then...
You want Data ONTAP to correct differences.	Enter the following command:`{ aggr \| vol } verify start { aggrname \| volname } {-f plexnumber}` `aggrname` is the name of the mirrored aggregate whose plexes you are comparing. `volname` is the name of the mirrored volume whose plexes you are comparing. Note: If `aggrname` or `volname` is not specified, the plexes of all online mirrored volumes are compared.
You do not want Data ONTAP to correct differences	Enter the following command:`{ aggr \| vol } verify start { aggrname \| volname } -n` If neither `aggrname` nor `volname` is specified, Data ONTAP compares the plexes of a mirrored aggregate or traditional volume for all aggregates or traditional volumes.

If...

Then...

You want Data ONTAP to correct differences.

Enter the following command:{ aggr | vol } verify start { aggrname | volname } {-f plexnumber}

aggrname is the name of the mirrored aggregate whose plexes you are comparing.

volname is the name of the mirrored volume whose plexes you are comparing.

Note: If aggrname or volname is not specified, the plexes of all online mirrored volumes are compared.

You do not want Data ONTAP to correct differences

Enter the following command:{ aggr | vol } verify start { aggrname | volname } -n

If neither aggrname nor volname is specified, Data ONTAP compares the plexes of a mirrored aggregate or traditional volume for all aggregates or traditional volumes.

Stopping plex comparison
You might need to stop Data ONTAP from comparing mirrored aggregate or traditional volume plexes. You might stop a comparison because it affects storage system performance.
Suspending plex comparison
Rather than stopping Data ONTAP from comparing the plexes of a mirrored aggregate or traditional volume, you can suspend the comparison of plexes. The comparison remains suspended until you resume it, stop it, or reboot the system.
Resuming plex comparison
After you have suspended a comparison of plexes, the comparison remains suspended until you resume it, stop it, or reboot the system.
Viewing the status of a plex comparison
Plex comparison status tells you what percentage of the plex comparison has been completed and whether plex comparison of a mirrored aggregate or traditional volume is suspended.

Parent topic: SyncMirror management