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Key ONTAP concepts
Configure ONTAP
- Decide whether to use the ONTAP CLI for cluster setup
- Set up a cluster with the ONTAP CLI
- Configure All SAN Array Software
Upgrade cluster
- Overview
- Upgrade Paths
- Upgrade with Upgrade Advisor
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- What should I verify before I upgrade with or without Upgrade Advisor?
- 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
- Overview
- 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?
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- What should I do after reverting my cluster?
Network management
- Manage your network with System Manager
  - View and manage your network
  - Download network data for reporting
- Set up NAS path failover with the CLI
  - ONTAP 9.8 and later
    - About NAS path failover for ONTAP 9.8 and later
    - Workflow NAS path failover
  - ONTAP 9.7 and earlier
    - Set up NAS path failover (ONTAP 9.0-9.7 CLI)
    - Workflow NAS path failover
- Manage your network with the CLI
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
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- Create nested igroup
- Map igroup to multiple LUNs
- SnapMirror Business Continuity overview
Provision NVMe storage
- SUSE Linux
Provision NAS storage
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- 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
- Install a FabricPool license
- 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
- Monitor risks
- 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 A and Mediator down and Site B down

04/29/2021 Contributors Download PDF of this page

Determining the cause:

Check the status of Mediator from Site A.

Example:

C1_cluster::*> snapmirror mediator show
Mediator Address Peer Cluster     Connection Status Quorum Status
---------------- ---------------- ----------------- -------------
10.237.86.17     C2_cluster       unreachable       true

C1_cluster::*> snapmirror list-destinations
                                                  Progress
Source             Destination         Transfer   Last         Relationship
Path         Type  Path         Status Progress   Updated      Id
----------- ----- ------------ ------- --------- ------------ ---------------
vs0:/cg/src_cg_1  XDP   vs1:/cg/dst_cg_1  OutOfSync  -         -            bba7d354-06f6-11eb-9138-005056acec19

Check Site B connectivity:

C1_sti78-vsim-ucs188a_cluster::*> cluster peer show
Peer Cluster Name         Cluster Serial Number Availability   Authentication
------------------------- --------------------- -------------- --------------
C2_cluster                1-80-000011           Unavailable    ok

Check the consensus status on SM-BC volume:

C1_cluster::*> volume show zrto_cg_894191_188b_RW1 -fields smbc-consensus
vserver volume                  smbc-consensus
------- ----------------------- ------------------
vs0     zrto_cg_894191_188b_RW1 Awaiting-consensus

Solution:

Complete the following steps to override SM-BC consensus and forcefully resume I/O on Site A:

Unmap the LUNs on Site A.
Issue the snapmirror release command using the -force and override-smbc-consensus option on Site A.
Remap the LUNs.
First, bring up Mediator, and then bring up the Site B nodes.
Resync the consistency group relationship using snapmirror resync.
After Site B is up, verify that the consistency group relationship is up and is in sync.
Perform a LUN rescan on the host to restore all paths to the LUNs.