Synchronous Replication Prerequisites and Limitations

The following list includes requirements and limitations for the use of synchronous replication.

General Limitations

• Array group can consist of only two single array pools
  • Multi-array pools are not supported
  • Synchronous replication of multiple pool volume collections is not supported
  • Moving synchronously replicated volumes between pools is not supported
• The maximum number of replication volumes is 512 upstream and 512 downstream volumes
• Synchronous Replication is not supported on the HF20H, CS1000H, or SFAxxx arrays.
• The hardware models must be the same for all arrays in the synchronous replication relationship
• A 10G link between the sites (Ethernet, not FC) is required
• Round trip latency between the sites should be less than or equal to five msec.
• You must install the latest host and client components
• Synchronous Replication only works through storage failover and does not support host level failover; consequently synchronous replication does not support site-to-site failover.

Operations and Features not Supported with Synchronous Replication

• Volume encryption
• Volume pinning
• Volume striping
• Volume resizing

  You must unconfigure synchronous replication to resize a volume.

• Volume move
• Folder space limits enforcement
• Snapshot replication

  A volume collection cannot be configured for both snapshot replication and synchronous replication.

• HPE Cloud Volume (CV) replication
• Virtual arrays
• Virtual volumes (vVols)
• SMI-S volumes
• Changing replication type
• Array replacement

  You must unconfigure synchronous replication to replace an array.

• Multiprotocol arrays (FC and iSCSI)
• Volume restore

  You must unconfigure synchronous replication to restore a volume.