Promote a load-sharing mirror

09/21/2023 Contributors

If a root volume is permanently unavailable, you can promote the load-sharing mirror (LSM) volume to provide write access to root volume data.

What you'll need

You must use advanced privilege level commands for this task.

Steps

Change to advanced privilege level:
```
set -privilege advanced
```
Promote an LSM volume:

You must replace the variables in angle brackets with the required values before running this command.
```
snapmirror promote -destination-path <SVM:volume>
```
For complete command syntax, see the man page.

The following example promotes the volume svm1_m2 as the new SVM root volume:
```
cluster_src::*> snapmirror promote -destination-path svm1:svm1_m2

Warning: Promote will delete the offline read-write volume
         cluster_src://svm1/svm1_root and replace it with
         cluster_src://svm1/svm1_m2. Because the volume is offline,
         it is not possible to determine whether this promote will
         affect other relationships associated with this source.
Do you want to continue? {y|n}: y
```
Enter y. ONTAP makes the LSM volume a read/write volume, and deletes the original root volume if it is accessible.

The promoted root volume might not have all of the data that was in the original root volume if the last update did not occur recently.
Return to admin privilege level:
```
set -privilege admin
```
Rename the promoted volume following the naming convention you used for the root volume:

You must replace the variables in angle brackets with the required values before running this command.
```
volume rename -vserver <SVM> -volume <volume> -newname <new_name>
```
The following example renames the promoted volume svm1_m2 with the name svm1_root:
```
cluster_src::> volume rename -vserver svm11 -volume svm1_m2 -newname svm1_root
```
Protect the renamed root volume, as described in step 3 through step 4 in Creating and initializing load-sharing mirror relationships.

Promote a load-sharing mirror

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