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
- Configure All SAN Array Software
Upgrade cluster
- Upgrade Paths
- How do I plan my upgrade?
  - With Upgrade Advisor
  - Without Upgrade Advisor
- What should I verify 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

Additional restrictions and limitations

05/04/2021 Contributors Download PDF of this page

There are several additional restrictions and limitations when using the SnapMirror Business Continuity solution.

Consistency groups

The maximum number of SnapMirror Synchronous consistency group relationships in a cluster is five, a limit which is platform-independent. If you reach or attempt to exceed this limit, the following message is displayed:

The number of SnapMirror Synchronous consistency group relationships in a cluster cannot exceed 5

Volumes per consistency group

The maximum number of volumes supported per SnapMirror Synchronous consistency group relationship is twelve, a limit which is platform-independent. If you reach or attempt to exceed this limit, the following message is displayed:

The number of volumes in a SnapMirror Synchronous Consistency Group cannot exceed 12

Volumes

The limit is on the number of endpoints and not the number of relationships. A consistency group with 12 volumes contributes 12 endpoints on both the source and destination.A SnapMirror Synchronous relationship with both source and destination volumes on the same HA pair contributes 2 endpoints.

The maximum endpoints per platform are included in the following table.

S. No	Platform	Endpoints per HA for SM-BC	Overall sync and SM-BC endpoints per HA
1	AFF	60	80
2	ASA	60	80

SAN object limits

The following SAN object limits are included in the following table and apply regardless of the platform.

Limits of objects in an SM-BC relationship	Count
LUNs per volume	256
LUN maps per node	2048
LUN maps per cluster	4096
LIFs per VServer (with at least one volume in an SM-BC relationship)	256
Inter-cluster LIFs per node	4
Inter-cluster LIFs per cluster	8

NTFS security style

NTFS security style is not supported on SM-BC volumes.