ONTAP home
Key ONTAP concepts
Configure ONTAP
- Decide whether to use the ONTAP CLI for cluster setup
- Set up a cluster with the ONTAP CLI
Upgrade cluster
- Upgrade Paths
- How do I plan my upgrade?
  - With Upgrade Advisor
  - Without Upgrade Advisor
- What should I check before I upgrade?
- How do I get and install the upgrade software image?
- Which upgrade method should I use?
- What should I do after my upgrade?
Revert cluster
- Do I need technical support?
- What are the revert paths?
- What should I read before I revert?
  - Pre-reversion resources
  - Revert considerations
- What should I verify before I revert?
- What else should I check before I revert?
- How do I get and install the revert software image?
- Revert my cluster
- What should I do after reverting my cluster?
Network management
- View and manage your network
- Download network data for reporting
- Set up NAS path failover (ONTAP 9.8 and later)
  - Workflow NAS path failover
  - Get more information
- Set up NAS path failover (ONTAP 9.0-9.7 CLI)
  - Workflow NAS path failover
  - Get more information
- ONTAP 9 Networking Reference
High availability
- How hardware-assisted takeover works
- How automatic takeover and giveback works
- Automatic takeover commands
- Automatic giveback commands
- Manual takeover commands
- Manual giveback commands
- Testing takeover and giveback
- Commands for monitoring an HA pair
- Commands for enabling and disabling storage failover
SnapMirror Business Continuity
- Introduction
- Planning
- Manage SnapMirror for Business Continuity using System Manager
- Installation and setup using the ONTAP CLI
- Administration
- Troubleshooting
Provision SAN storage
- VMware datastores
- Linux servers
- Windows servers
- Create nested igroup
- Map igroup to multiple LUNs
- SnapMirror Business Continuity overview
Provision NVMe storage
- SUSE Linux
Provision NAS storage
- VMware datastores
- Home directories
- Linux servers
- Export policies
- Windows servers
- Both Windows and Linux
- Secure client access with Kerberos
- Provide client access with name services
- Large file systems with FlexGroups
- Manage directories and files
- Monitor volume usage with ONTAP File System Analytics
- Monitor NFS active clients
- Improve performance for multiple clients
- Enable NAS storage
Provision object storage
- Enable S3 server
- Provision buckets
- Add S3 users and groups
- Manage bucket access
- Manage storage VM access
Manage resources using quotas
- Limit resource use
Maximize security
- Multi-factor authentication
- Control administrator access
- Encrypt stored data (software)
- Encrypt stored data (hardware)
- Diagnose and correct file access issues
Protect data
- Create custom data protection policies
- Configure Snapshot copies
- Recover from Snapshot copies
- Prepare for mirroring and vaulting
- Configure mirrors and vaults
- Configure storage VM disaster recovery
- Serve data from a destination
- Resynchronize a protection relationship
- Restore a volume from an earlier Snapshot copy
- Restore to a new volume
- Reverse resynchronize a protection relationship
- Reactivate a source storage VM
- Resynchronize a destination storage VM
- Back up to the cloud
Extend to the cloud
- Add a connection to the cloud
- Tier data to the cloud
- Tier data to local bucket
- Create tiering object tags
- Enable inactive data reporting
- Back up data using the Cloud Backup Service
- Manage the connections to the Cloud Backup Service
View cluster performance
- Dashboard tour
- Identify hot objects
- Monitor cluster performance using System Manager
- Monitor cluster performance with Unified Manager
- Monitor cluster performance with Cloud Insights
Day-to-day administration
- Search, filter, and sort
- Enable new features
- Manage nodes
- View hardware configurations and determine problems
- View and submit support cases
- Manage MetroCluster sites
- Clone data
- Modify QoS
- Update firmware
- Manage storage
Rest API
- Rest log overview
- Access the REST API log
Get more information
Notices

Link between Site B and Mediator down and Site A down

04/29/2021 Download PDF of this page

Example:

cluster::*> snapmirror mediator show
Mediator Address Peer Cluster     Connection Status Quorum Status
---------------- ---------------- ----------------- -------------
10.237.86.17     C1_cluster       unreachable       true
SnapMirror consistency group relationship status is out of sync.

C2_cluster::*> snapmirror show -expand
Source            Destination Mirror  Relationship   Total             Last
Path        Type  Path        State   Status         Progress  Healthy Updated
----------- ---- ------------ ------- -------------- --------- ------- --------
vs0:/cg/src_cg_1 XDP vs1:/cg/dst_cg_1 Snapmirrored OutOfSync - false   -
vs0:zrto_cg_655724_188a_RW1 XDP vs1:zrto_cg_655755_188c_DP1 Snapmirrored OutOfSync - false -
vs0:zrto_cg_655733_188a_RW2 XDP vs1:zrto_cg_655762_188c_DP2 Snapmirrored OutOfSync - false -
vs0:zrto_cg_655739_188b_RW1 XDP vs1:zrto_cg_655768_188d_DP1 Snapmirrored OutOfSync - false -
vs0:zrto_cg_655748_188b_RW2 XDP vs1:zrto_cg_655776_188d_DP2 Snapmirrored OutOfSync - false -
5 entries were displayed.

Site B cluster is unable to reach Site A.
C2_cluster::*> cluster peer show
Peer Cluster Name         Cluster Serial Number Availability   Authentication
------------------------- --------------------- -------------- --------------
C1_cluster 			  1-80-000011           Unavailable    ok

Solution

Force a failover to enable I/O from Site B and then establish a zero RTO relationship from Site B to Site A.

Complete the following steps to perform a forced failover on Site B.

Unmap all LUNs belonging to the consistency group from Site B.
Delete the SnapMirror consistency group relationship using the force option.
Enter the snapmirror break command on the consistency group constituent volumes to convert volumes from DP to RW, to enable I/O from Site B.
Boot up the Site A nodes to create a zero RTO relationship from Site B to Site A.
Release the consistency group with relationship-info-only on Site A to retain common Snapshot copy and unmap the LUNs belonging to the consistency group.
Convert volumes on Site A from RW to DP by setting up a volume level relationship using either Sync policy or Async policy.
Issue the snapmirror resync to synchronize the relationships.
Delete the SnapMirror relationships with Sync policy on Site A.
Release the SnapMirror relationships with Sync policy using relationship-info-only true on Site B.
Create a consistency group relationship from Site B to Site A.
Perform a consistency group resync from Site A, and then verify that the consistency group is in sync.
Rescan host LUN I/O paths to restore all paths to the LUNs.