Preparing for switchback in a MetroCluster FC configuration

You must perform certain tasks in order to prepare the MetroCluster FC configuration for the switchback operation.

  1. Verifying port configuration (MetroCluster FC configurations only)
    You must set the environmental variables on the node and then power it off to prepare it for MetroCluster configuration.
  2. Configuring the FC-to-SAS bridges (MetroCluster FC configurations only)
    If you replaced the FC-to-SAS bridges, you must configure them when restoring the MetroCluster configuration. The procedure is identical to the initial configuration of an FC-to-SAS bridge.
  3. Configuring the FC switches (MetroCluster FC configurations only)
    If you have replaced the FC switches in the disaster site, you must configure them using the vendor-specific procedures. You must configure one switch, verify that storage access on the surviving site is not impacted, and then configure the second switch.
  4. Verifying the storage configuration
    You must confirm that all storage is visible from the surviving nodes.
  5. Powering on the equipment at the disaster site
    You must power on the MetroCluster components at the disaster site when you are ready to prepare for switchback. In addition, you must also recable the SAS storage connections in direct-attached MetroCluster configurations and enable non-Inter-Switch Link ports in fabric-attached MetroCluster configurations.
  6. Assigning ownership for replaced drives
    If you replaced drives when restoring hardware at the disaster site or you had to zero drives or remove ownership, you must assign ownership to the affected drives.
  7. Performing aggregate healing and restoring mirrors (MetroCluster FC configurations)
    After replacing hardware and assigning disks, you can perform the MetroCluster healing operations. You must then confirm that aggregates are mirrored and, if necessary, restart mirroring.
  8. Reassigning disk ownership for root aggregates to replacement controller modules (MetroCluster FC configurations)
    If one or both of the controller modules or NVRAM cards were replaced at the disaster site, the system ID has changed and you must reassign disks belonging to the root aggregates to the replacement controller modules.
  9. Booting the new controller modules (MetroCluster FC configurations)
    After aggregate healing has been completed for both the data and root aggregates, you must boot the node or nodes at the disaster site.
Parent topic: Preparing the disaster site for switchback
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Part number: 215-11167_2021-02_en-us
February 2021
Updated for ONTAP 9.8