SnapMirror and NetApp storage efficiency

[Jerry2]

Dear NetApp Gurus,

I would like to know something more about data compresion during the SnapMirror replication.

In my opinion, a snapmirror source can not be compressed, but the destination volume can be compressed. I rememeber, that I read somewhere this sentences. Am I right? However, in the documentation (https://www.netapp.com/media/17229-tr4015.pdf?v=127202175503P) there is written that If the source volume is compressed, the destination volume is in a
compressed state as well. Replication of compressed volumes does not decompress the source volume
to read data for a transfer. Rather, data is replicated in a compressed state to the destination volume. So, it means that data compression can be enabled between the source and the destination source independently. Is it correct?

[RossC]

Hi @Jerry2 

Not sure if you've managed to get the answer you were looking for. I suggest taking a look at the first paragraph on this link - https://docs.netapp.com/us-en/ontap/data-protection/manage-storage-efficiency-task.html

It summarizes how efficiency and Snapmirror work quite well. 

Hope this helps. 

[Harri]

Hi all,

In case of FAS (postprocess deduplication, not inline), should I enable the destination volume efficiency to get data deduplicated or is it  already transferred and stored as deduplicated by SnapMirror if the source volume has efficiency enabled?

https://kb.netapp.com/Advice_and_Troubleshooting/Data_Protection_and_Security/SnapMirror/Understanding_SnapMirror_storage_efficiency

[chenguanghui]

hello:

         1.The content of this article will be helpful to you:

       https://kb-cn.netapp.com/on-prem/ontap/dp/SnapMirror/SnapMirror-KBs/How_to_enable_SnapMirror_storage_efficiency_between_volumes_with_different_compres... 

2. This article introduces the principles of data compression

https://docs.netapp.com/a/ontap/cdot/8.3/Logical-Storage-Management-Guide-zh-cn.pdf 

3.This article describes the impact of some operations on the storage efficiency of a volume

https://docs.netapp.com/us-en/ontap/volumes/storage-efficiency-behavior-snapmirror-reference.html