Hi, I am having two physical sites with on-prem nutanix cluster. I am trying to config async dr from primary to secondary site every one hour. So the snapshot will trigger every one hour and replicate to the secondary site. I read in the portal , the first replica is a full copy and the subsequent are incremental. My question here is , once my first replica, which is a full copy of my data was completed to the secondary site and certain period of time, my first replica will expire and deleted based on my retention configuration. In that case, how can I restore my full data with the help of incremental snapshot from the remote site?
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Userlevel 1
+1
Hi Jai, for Disaster Recovery, you will ideally install a PC at each site for best availability. This will also require you to have either: Pro license with Advanced Replication add-on, or Ultimate license.
+2
Thanks. If I want to use Disaster recovery(Leap) solution in my environment between two different sites. How many Prism Central I need to deploy ? and What License I need to have to use the DR feature?
-jai
Userlevel 3
+5
Hi,
Yes, as part of garbage collection the when the retention is over the snapshots are deleted, means they are merged. I would recommend to read the following based on your requirements to understand the DR and its requirements based on RPO/RTO.
F>P
+2
So the second and subsequent snapshot will have all the data even the first snapshot got deleted because it get sync with that. Am i correct ?. Also I am trying to prepare a HLD for Nutanix Dr solutions. Let me know what are the things to be mentioned or any link is available for guidance?
Userlevel 3
+5
Hi Jaya,
Let me try to explain, When u first configure the PD and start replication the first sync is all data replicated to secondary site, unless the first sync is not completed the incremental schedules are not initiated.
Once first sync is done and data is in sync, the PD schedule is triggered for any incremental/delta. That will take a snapshot at primary, then that snapshot metadata is send along with the delta to secondary, hence the secondary knows the details when and what the delta is for.
This is followed as per your configured schedule, now your question about retention. when you say maintain 3 snapshots, then when the 4th snapshot is replicated successfully the last snapshot is deleted, like FIFO, when we say snapshot is deleted means the data of the snapshot is merged with the actual data. The snapshot is basically point in time of chain of chances in data.
The following link might help u understand more.
https://next.nutanix.com/how-it-works-22/snapshots-so-simple-and-yet-so-complicated-faq-38007
https://next.nutanix.com/how-it-works-22/snapshots-so-simple-and-yet-so-complicated-faq-part-2-38061
F>P
+2
Ok..It means all the snapshots having full data but only the initial snap needs to send full copy of data. The Subsequent snaps always have all the data but only during data transmission it will transfer only the delta. How the subsequent snap get sync with initial snap ? how it works in the backend?
Hi,
you will always have one or more fully restorable snapshots at your secondary site. This needs a full copy for the first sync, while during subsequent syncs, only a delta is copied over. The snapshots are not incremental like incremental backups that need to keep an initial full.
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