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Synchronous Replication Requirements

  • 26 September 2022
  • 2 replies
  • 707 views

Hello everyone.

I am planning synchronous replication between two sites with AHV, and the prerequisites are not clear in the documentation. I have 960GB SSD disks on the hosts. Apparently the minimum required is 1.2TB but it's not explicit in the documentation. Does anyone know where I can validate this information?

 

Thanks! :)

Nutanix AHV Support 2 options:

  • Near-Sync
    • for Near-Sync atleast 1.2TB SSD is required. 
    • RPO you get below 15Mins 
  • Sync Rep (Metro)
    • Real Time Replication ( Zero RPO)
    • each site has its own Nutanix cluster, however the containers are “stretched” by synchronously replicating to the remote site before acknowledging writes.
    • Basically you should have enough SSD free for Sync Rep data.

Please Nutanix DR Documentation for details

For DR solutions with Asynchronous, NearSync, and Synchronous replication schedules to succeed, the nodes in the on-prem AZs (AZs or AZs) must have certain resources. This section provides information about the node, disk and Foundation configurations necessary to support the RPO-based recovery point frequencies.

  • The conditions and configurations provided in this section apply to Local and Remote recovery points.

  • Any node configuration with two or more SSDs, each SSD being 1.2 TB or greater capacity, supports recovery point frequency for NearSync.

  • Any node configuration that supports recovery point frequency of six (6) hours also supports AHV-based Synchronous replication schedules because a protection policy with Synchronous replication schedule takes recovery points of the protected VMs every 6 hours.

Reference: https://portal.nutanix.com/page/documents/details?targetId=Leap-Xi-Leap-Admin-Guide-v2022_6:ecd-ecdr-resource-requirements-r.html

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