The Web Services Proxy service must be running.

Unified Manager must be running on your local host through an HTTPS connection.

Unified Manager must be showing valid SSL certificates for the storage array. You can accept a self-signed certificate or install your own security certificate using Unified Manager and navigating to Certificate › Certificate Management.

You must have two storage arrays.

Each storage array must have two controllers.

The two storage arrays must be discovered in Unified Manager.

Each controller in both the primary array and secondary array must have an Ethernet management port configured and must be connected to your network.

The storage arrays have a minimum firmware version of 7.84. (They can each run different OS versions.)

You must know the password for the local and remote storage arrays.

You must have enough free capacity on the remote storage array to create a secondary volume equal to or greater than the primary volume that you want to mirror.

Your local and remote storage arrays are connected through a Fibre Channel fabric.

RAID level, caching parameters, and segment size can be different on the primary and secondary volumes of a synchronous mirrored pair.

The primary and secondary volumes in a synchronous mirrored pair must be standard volumes. They cannot be thin volumes or snapshot volumes.

The secondary volume must be at least as large as the primary volume.

Only the primary volume may have snapshots associated with it and/or be the source or target volume in a volume copy operation.

A volume can participate in only one mirror relationship.

There are limits to the number of volumes that are supported on a given storage array. Make sure that the number of configured volumes on your storage array is less than the supported limit. When synchronous mirroring is active, the two reserved capacity volumes that are created count against the volume limit.

Reserved capacity is required for a primary volume and for a secondary volume for logging write information to recover from controller resets and other temporary interruptions.

The reserved capacity volumes are created automatically when synchronous mirroring is activated. Because both the primary volume and the secondary volume in a mirrored pair require reserved capacity, you must ensure that you have enough free capacity available on both storage arrays that are participating in the synchronous mirror relationship.

If you are using secure-capable drives, the primary volume and the secondary volume must have compatible security settings. This restriction is not enforced; therefore, you must verify it yourself.

If you are using secure-capable drives, the primary volume and the secondary volume should use the same drive type. This restriction is not enforced; therefore, you must verify it yourself.

If you are using Data Assurance (DA), the primary volume and the secondary volume must have the same DA settings.