Creating a mirror relationship from a destination SVM

You can create a mirror relationship between a source volume and a destination volume from the destination Storage Virtual Machine (SVM), and assign a mirror policy and schedule to the mirror relationship. The mirror copy enables quick availability and restoration of data if the data on the source volume is corrupted or lost.

Before you begin

•	The SnapMirror license must be enabled on both the source and the destination storage systems or the nodes that contain the source and destination volumes.

•	The source and destination clusters must be added to System Manager.

If you have added the source cluster after you have opened the destination cluster management window, you must close the management window and log in to the destination cluster again to view the source cluster.

•	If you have renamed a cluster after adding it to System Manager, you must have deleted it and added it again.

Otherwise, you cannot create a mirror relationship in System Manager.

•	The clusters must not have the same name.

•	If the source and destination clusters are in a peer relationship, the relationship state must be healthy.

Peer relationships might be in an unhealthy state due to various reasons—for example, intercluster LIFs between the clusters are down. In such cases, you might be able to successfully create vault relationships, but subsequent operations, such as initialization, might fail.

•	The destination aggregate must have available space.

•	The source volume of type read/write (rw) must already exist.

•	If the destination volume exists, the capacity of the destination volume must be greater than or equal to the capacity of the source volume.

•	The destination volume must not be the root volume of a storage system.

•	For Infinite Volumes, the destination Storage Virtual Machine (SVM) must not contain a read/write Infinite Volume or an Infinite Volume with storage classes.

•	If source and destination Infinite Volumes share aggregates with other Infinite Volumes or FlexVol volumes in the same cluster, sufficient shared aggregate space must be available for the destination Infinite Volume.

If source and destination Infinite Volumes do not share aggregates with other Infinite Volumes or FlexVol volumes in the same cluster, you can create the same number and size of aggregates for the destination volume as those used by the source volume.

•	If the destination volume exists, the volume must not be the destination for any other mirror relationship.

About this task

•	You cannot use System Manager to create a SnapMirror relationship if the source volume is an Infinite Volume with storage classes.

Instead, you should use OnCommand Workflow Automation.

•	System Manager does not support a cascade relationship.

For example, a destination volume in a relationship cannot be the source volume in another relationship.

•	The destination volume that is created for a mirror relationship is not thin provisioned.

Steps

1.	From the home page, double-click the appropriate storage system.

2.	Expand the Storage Virtual Machines hierarchy in the left navigation pane.

3.	In the navigation pane, select the SVM, and click Protection.

4.	In the Protection window, click Create > Mirror.

5.	In the Create Mirror Relationship from Destination window, specify the cluster, the SVM, and the source volume.

If System Manager is unable to retrieve the credentials of the specified cluster, you can use the Authenticate link to enter and save the credentials.

6.	If the source and destination clusters are not in a peer relationship, you can use the Create Peer link to create a peer relationship between the destination cluster and the source cluster.

7.	For FlexVol volumes, you can either create a new destination volume or select an existing volume:

If you want to...	Do the following...
Create a new volume	If you want to change the default name, displayed in the format source_SVM_name_source_volume_name_mirror, specify a new name and select the containing aggregate for the destination volume.
Select an existing volume	Select the Select Volume option. Only those volumes with the same language attribute as the source volume are listed.

For Infinite Volumes, you can create a destination volume only if the destination SVM does not contain a volume.

8.	Select an existing policy or create a new policy:

If you want to...	Do the following...
Select an existing policy	Select a mirror policy from the list.
Create a new policy	Click Create Policy, and then specify a policy name, set schedule transfer priority, and click Create. Low indicates that the transfer has the least priority and is usually scheduled after normal priority transfers. By default, the priority is set to normal.

9.	Specify a schedule for the relationship:

If...

Do the following...

You want to assign an existing schedule

From the list of schedules, select an existing schedule.

You want to create a new schedule

a.	Click Create Schedule.

b.	Specify a name for the schedule.

c.	Select either Basic or Advanced.

•	Basic: You can select this option to specify only the day of the week, time, and the transfer interval.

•	Advanced: You can select this option to specify a cron style schedule.

d.	Click Create.

You do not want to assign a schedule

Select None.

10.	Select Initialize Relationship to initialize the mirror relationship.

11.	Click Create.

Result

If you chose to create a new destination volume, then a new destination volume of type dp is created with the following default settings:

•	Autogrow is enabled in case of FlexVol volumes

•	Compression is disabled in case of FlexVol volumes

•	Language attribute is set match the language attribute of the source volume

If the destination FlexVol volume is on a different SVM than the source, then a peer relationship is created between the two SVMs if the relationship does not already exist.

A mirror relationship is created between the source volume and the destination volume. The base Snapshot copy is transferred to the destination volume if you have opted to initialize the relationship.

Related concepts

Aggregate requirements for destination Infinite Volumes

Related reference

Protection window