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Prerequisites for ONTAP SnapMirror active sync

Contributors netapp-sarajane netapp-ahibbard netapp-lenida netapp-dbagwell
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When planning your SnapMirror active sync deployment, ensure you have met the various hardware, software, and system configuration requirements.

Hardware

The following table outlines the supported NetApp cluster configurations.

Cluster type

Supported models

Supported features

Maximum supported cluster nodes

AFF

A-Series, C-Series

Automated Failover Duplex (Symmetric Active/Active), Automated Failover (Asymmetric Active/Active)

  • 2 (ONTAP 9.9.1 or later)

  • 4 (ONTAP 9.16.1 with Symmetric Active/Active configurations)

ASA

A-Series, C-Series

Automated Failover Duplex (Symmetric Active/Active), Automated Failover (Asymmetric Active/Active)

  • 2 (ONTAP 9.9.1 or later

  • 4 (ONTAP 9.16.1 with Symmetric Active/Active configurations)

ASA r2

All

Automated Failover Duplex (Symmetric Active/Active)

2

The table below outlines the capability for replication between cluster types.

Cluster type 1

Cluster type 2

Replication supported?

AFF A-Series

AFF C-Series

Yes

ASA r2 A-Series

ASA r2 C-Series

Yes

AFF

ASA

No

ASA

ASA r2

No

ASA r2

ASA r2

Yes

Software

  • ONTAP 9.9.1 or later

  • ONTAP Mediator 1.2 or later

  • A Linux server or virtual machine for ONTAP Mediator running one of the following:

ONTAP Mediator version

Supported Linux versions

1.10

  • Red Hat Enterprise Linux

    • Compatible: 9.5 1

    • Recommended: 10, 9.6, 9.4, and 8.10

  • Rocky Linux 10, 9.6, and 8.10

1.9.1

  • Red Hat Enterprise Linux

    • Compatible: 9.3, 9.1, 8.9, 8.7, 8.6, 8.5, and 8.4 1

    • Recommended: 9.5, 9.4, 9.2, 9.0, 8.10, and 8.8

  • Rocky Linux 9.5 and 8.10

1.9

  • Red Hat Enterprise Linux

    • Compatible: 9.3, 9.1, 8.9, 8.7, 8.6, 8.5, and 8.4 1

    • Recommended: 9.5, 9.4, 9.2, 9.0, 8.10, and 8.8

  • Rocky Linux 9.5 and 8.10

1.8

  • Red Hat Enterprise Linux:

    • Compatible: 8.7, 8.6, 8.5, and 8.4 1

    • Recommended: 9.4, 9.3, 9.2, 9.1, 9.0, 8.10, 8.9, and 8.8

  • Rocky Linux 9.4 and 8.10

1.7

  • Red Hat Enterprise Linux:

    • Compatible: 8.7, 8.6, 8.5, and 8.4 1

    • Recommended: 9.3, 9.2, 9.1, 9.0, 8.9, and 8.8

  • Rocky Linux 9.3 and 8.9

1.6

  • Red Hat Enterprise Linux:

    • Compatible: 8.7, 8.6, 8.5, and 8.4 1

    • Recommended: 9.2, 9.1, 9.0, and 8.8

  • Rocky Linux 9.2 and 8.8

1.5

  • Red Hat Enterprise Linux: 8.5, 8.4, 8.3, 8.2, 8.1, 8.0, 7.9, 7.8, 7.7, and 7.6

  • CentOS: 7.9, 7.8, 7.7, and 7.6

1.4

  • Red Hat Enterprise Linux: 8.5, 8.4, 8.3, 8.2, 8.1, 8.0, 7.9, 7.8, 7.7, and 7.6

  • CentOS: 7.9, 7.8, 7.7, and 7.6

1.3

  • Red Hat Enterprise Linux: 8.3, 8.2, 8.1, 8.0, 7.9, 7.8, 7.7, and 7.6

  • CentOS: 7.9, 7.8, 7.7, and 7.6

1.2

  • Red Hat Enterprise Linux: 8.1, 8.0, 7.9, 7.8, 7.7, and 7.6

  • CentOS: 7.9, 7.8, 7.7, and 7.6

  1. Compatible means that Red Hat no longer supports these RHEL versions, but ONTAP Mediator can still be installed on them.

Licensing

The following SnapMirror licenses are available as part of the ONTAP One license suite and must be applied on both clusters:

  • SnapMirror synchronous

  • SnapMirror

    Note If your ONTAP storage systems were purchased before June 2019, see NetApp ONTAP Master License Keys to get the required SnapMirror synchronous license.

  • For VMware, a vSphere Metro Storage Cluster (vMSC) license is required.

Networking environment

  • Inter-cluster latency round trip time (RTT) must be less than 10 milliseconds.

  • Beginning with ONTAP 9.14.1, SCSI-3 persistent reservations are supported with SnapMirror active sync.

Supported protocols

SnapMirror active sync supports SAN protocols.

  • The FC and iSCSI protocols are supported beginning with ONTAP 9.9.1.

  • The NVMe protocol is supported with VMware workloads beginning with ONTAP 9.17.1.

    Note NVMe/TCP with VMware depends on the resolution of VMware Bug ID: TR1049746.

    SnapMirror active sync does not support the following with the NVMe protocol:

    • 4-node symmetric active/active configurations

    • Asymmetric active/active configurations

    • Changes in consistency group size

      You cannot expand or shrink a consistency group when using the NVMe protocol with SnapMirror active sync.

    • Coexistence of LUNs and namespaces in the same consistency group.

IPspace

The default IPspace is required by SnapMirror active sync for cluster peer relationships. Custom IPspaces are not supported.

NTFS Security Style

NTFS security style is not supported on SnapMirror active sync volumes.

ONTAP Mediator

  • ONTAP Mediator must be provisioned externally and attached to ONTAP for transparent application failover.

  • To be fully functional and to enable automatic unplanned failover, the external ONTAP Mediator should be provisioned and configured with ONTAP clusters.

  • ONTAP Mediator must be installed in a third failure domain, separate from the two ONTAP clusters.

  • When installing ONTAP Mediator, you should replace the self-signed certificate with a valid certificate signed by a mainstream reliable CA.

  • For more information about ONTAP Mediator, see Prepare to install ONTAP Mediator.

Other prerequisites

  • In releases earlier than ONTAP 9.15.1, SnapMirror active sync relationships are not supported on read-write destination volumes volumes (volumes converted to read-write from DP in an asymmetric active-active). Before you can use a read-write volume, you must convert it to a DP volume by creating a volume-level SnapMirror relationship (either async or sync) and then deleting the relationship. For details, see Convert an existing SnapMirror relationships to SnapMirror active sync.

  • Storage VMs using SnapMirror active sync cannot be joined to Active Directory as a client computer.

Further information