Splitting mirrored aggregates or traditional volumes

What splitting a mirrored aggregate or traditional volume is

Splitting a mirrored aggregate or traditional volume removes the relationship between its two plexes and creates two independent unmirrored aggregates or traditional volumes. After splitting, the new aggregate or traditional volume is in a restricted state and the original aggregate or traditional volume stays in an online state.

Note
To mirror one or both of these aggregates or traditional volumes, see Adding a plex. To rejoin the aggregates or traditional volumes that you split, see Rejoining split aggregates or traditional volumes.

Why you might split a mirrored aggregate or traditional volume

You might split a mirrored aggregate or traditional volume for one of the following reasons:

You want to stop mirroring an aggregate or traditional volume. This is an alternative to the procedure described in Removing and destroying a plex.
You want to move a mirrored aggregate or traditional volume to another location.
You want to modify the mirrored aggregate or traditional volume, and test the modification before applying it. You can apply and test the modifications and test on the split-off copy of the plex, then apply those changes to the untouched original plex.
Note
You do not need to stop applications that are running before splitting a mirrored aggregate or traditional volume.

Splitting a mirrored aggregate or traditional volume

To split a mirrored aggregate or traditional volume into two independent unmirrored aggregates or traditional volumes, complete the following step.

Note
Ensure that both plexes of the mirrored aggregate or traditional volume you are splitting are online and operational. For information about viewing the state of a plex, see Changing the state of a plex.

Step	Action
1	Enter the following command: *{ aggr \| vol } split plexname* { aggrname \| volname }** plexname is the name of one of the plexes in the mirrored volume. aggrname is the name of the new aggregate. volname is the name of the new traditional volume. Example In this example, use the following command to split plex0 from mirrored aggregate aggr0 and name the new aggregate aggrNew: aggr split aggr0/plex0 aggrNew After splitting, there are two unmirrored aggregates, aggr0 and aggrNew. Example In this example, use the following command to split plex0 from mirrored volume vol0 and name the new volume volNew: vol split vol0/plex0 volNew After splitting, there are two unmirrored volumes, vol0 and volNew.

Step

Action

Enter the following command:

{ aggr | vol } split plexname { aggrname | volname }

plexname is the name of one of the plexes in the mirrored volume.

aggrname is the name of the new aggregate. volname is the name of the new traditional volume.

Example

In this example, use the following command to split plex0 from mirrored aggregate aggr0 and name the new aggregate aggrNew:

aggr split aggr0/plex0 aggrNew

After splitting, there are two unmirrored aggregates, aggr0 and aggrNew.

Example

In this example, use the following command to split plex0 from mirrored volume vol0 and name the new volume volNew:

vol split vol0/plex0 volNew

After splitting, there are two unmirrored volumes, vol0 and volNew.

Volume structure after splitting

Before splitting, a mirrored aggregate or traditional volume has two plexes, plex0 and plex1. After splitting, the new unmirrored aggregate or traditional volume with the new name has one plex, plex0. The new unmirrored aggregate or traditional volume with the original name also has one plex, either plex0 or plex1.

The plex name for an unmirrored aggregate or traditional volume is unimportant because the aggregate or traditional volume has only one plex. If you remirror one of these unmirrored aggregates or volumes, the resulting plex names will always be plex0 and plex1.