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Convert existing relationships to SM-BC relationships

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You can convert an existing zero recovery point protection (zero RPO) Synchronous SnapMirror relationship to an SM-BC zero RTO Synchronous SnapMirror consistency group relationship.

Before you begin

  • A zero RPO Synchronous SnapMirror relationship exists between the primary and secondary.

  • All LUNs on the destination volume are unmapped before the zero RTO SnapMirror relationship is created.

  • SM-BC only supports SAN protocols (not NFS/CIFS). Ensure no constituent of the consistency group is mounted for NAS access.

About this task

  • You must be a cluster and SVM administrator on the source and destination.

  • You cannot convert zero RPO to zero RTO sync by changing the SnapMirror policy.

  • If existing LUNs on the secondary volume are mapped, snapmirror create with AutomatedFailover policy triggers an error.
    You must ensure the LUNs are unmapped before issuing the snapmirror create command.

Steps

  1. Perform a SnapMirror update operation on the existing relationship:

    destination::>snapmirror update -destination-path vs1_dst:vol1

  2. Verify that the SnapMirror update completed successfully:

    destination::>snapmirror show

  3. Quiesce each of the zero RPO synchronous relationships:

    destination::>snapmirror quiesce -destination-path vs1_dst:vol1

    destination::>snapmirror quiesce -destination-path vs1_dst:vol2

  4. Delete each of the zero RPO synchronous relationships:

    destination::>snapmirror delete -destination-path vs1_dst:vol1

    destination::>snapmirror delete -destination-path vs1_dst:vol2

  5. Release the source SnapMirror relationship but retain the common Snapshot copies:

    source::>snapmirror release -relationship-info-only true -destination-path vs1_dst:vol1

    source::>snapmirror release -relationship-info-only true -destination-path vs1_dst:vol2

  6. Create a group zero RTO Synchronous Snapmirror relationship:

    destination::> snapmirror create -source-path vs1_src:/cg/cg_src -destination-path vs1_dst:/cg/cg_dst -cg-item-mappings vol1:@vol1,vol2:@vol2 -policy AutomatedFailover

  7. Resynchronize the zero RTO consistency group:

    destination::> snapmirror resync -destination-path vs1_dst:/cg/cg_dst

  8. Rescan host LUN I/O paths to restore all paths to the LUNs.

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