topic Difference in pri en sec snapshots ONTAP 9.3 in Data Protection

Difference in pri en sec snapshots ONTAP 9.3

Sander — Wed, 04 Jun 2025 13:06:58 GMT

Hi community,

thing is i'm struggeling with snapshot sizes on primary and secondary ONTAP 9.3P2 controllers.

Am i right to presume that when i take a daily snapshot on the primary with a snapmirror label _daily on it (let's say 100GB), this is transferred to the secondary Netapp with a SnapMirror XDP policy, this has to be the same size on the secondary (100GB)? I mean SM policy picks the SnapShot with the _Daily SM label, so it has to be the same snapshot on the secondary?

I see some big differences in snapshot size with the same name on pri and sec. Netapp.

Attached is a file with volumename, snapshotname and sizes.

Re: Difference in pri en sec snapshots ONTAP 9.3

mrahul — Thu, 29 Nov 2018 07:07:42 GMT

The update from primary to secondary is only the data that has changed since the previous update.

Re: Difference in pri en sec snapshots ONTAP 9.3

DataOntaper — Mon, 03 Dec 2018 09:12:47 GMT

Consideration for the Size of Snapshots/Data on 2 differnt Controllers:

Detailed information's about impact of Dedupe and Compression can be found in our Technical Report

TR-4476 NetApp Data Compression, Deduplication,and Data Compaction