When configuring a VPG, Zerto Virtual Replication provides an option to mark individual volumes as “Swap”.
This functionality is extremely useful when your operating system or database has a dedicated volume for swap, virtual memory, temporary backups, or files that are only relevant to a live and running machine and are useless following a reboot.
When one of the protected VM volumes is marked as a temp data (“Swap”) volume, upon saving the VPG, the volume will undergo an Initial Sync, however, all subsequent IOs to that volume will be ignored.
The purpose of the Initial Sync's is to make sure the full remote file system is available in the event of a Failover Test, Live Failover, Move, or Offsite Clone operation.
This means that if TempDB and a Windows Paging file, for example, are placed on separate VMDKs/RDMs and set as Temp Data in Zerto, an initial copy of the disk will be replicated to the recovery site, but subsequent changes will not be replicated.
To designate a volume as swap while adding a VM to a VPG, follow these steps:
- From the Edit VPG screen -> Storage tab
- Select the relevant Protected Volume from the Volumes list
- Check the 'Temp Data' checkbox for relevant volumes.
- Make any additional changes to the VPG you need, and click 'DONE'