Failover & Failback synchronization

[itdirector]

Regarding Failover & failback synchronization:

Test scenario:
-Replication job finishes at 8:00AM on Monday, replicating an Exchange 2010 VM from server 1 to server 2.
-At 11:00AM on Monday, the live/production Exchange 2010 VM on server 1 crashes.
- We failover to the Exchange 2010 VM replica on server 2 at 11:15AM via VBR. Everything comes up fine & emails are received & sent, except for the missing emails/items from 8:00AM till 11:15AM.
- We repair the original Exchange 2010 VM on server 1 at 4:00PM the same day.
- We failback from the Exchange 2010 replica on server to 2 back to the original server 1 via VBR.

The question with the above scenario is: what data gets synchronized? as in, I know the emails/items from 11:15AM till 4:00PM will be synced, so the primary Exchange 2010 VM on server 1 will have the latest data after failback; however, what about the emails/data from 8:00AM till 11:00AM. Will that data still be available on Exchange 2010 on server 1 after the failback, or will it have been overwritten?

vSphere 5 : ESXi on both server 1 & 2
VBR version 6.1
Thx

[Vitaliy S.]

Hello,

This data will be overwritten, as during failback operation Veeam calculates the differences between two VMs (on the block level) and then synchronizes the original VM with the VM replica. In other words, at the end of this procedure you will have two identical VM images.

Thank you.