topic how can i turn on Inline zero-block deduplication without Inline deduplication pn ONTAP 9.1? in ONTAP Discussions

how can i turn on Inline zero-block deduplication without Inline deduplication pn ONTAP 9.1?

GidonMarcus — Wed, 04 Jun 2025 14:36:18 GMT

Hi.

The following TR recommends to enable "Inline zero-block deduplication" for file services on HDD, but unlike other type of workloads and disks not "Inline deduplication"

https://www.netapp.com/us/media/tr-4476.pdf

The only problem. is that i can;'t find how to do it. without enabling inline dedupe

http://docs.netapp.com/ontap-9/index.jsp?topic=%2Fcom.netapp.doc.dot-cm-cmpr-910%2FTOC__volume__efficiency__policy.html

http://docs.netapp.com/ontap-9/index.jsp?topic=%2Fcom.netapp.doc.dot-cm-cmpr-910%2Fvolume__efficiency__modify.html

Any Idea ?

Thanks

Re: how cani turn on Inline zero-block deduplication without Inline deduplication pn ONTAP 9.1?

sgrant — Mon, 18 Sep 2017 14:26:50 GMT

Hello, the inline zero-block deduplication is automatically enabled when dedupe is enabled, since Clustered Data ONTAP 8.3.2.

Inline detection on deduplication-enabled volumes to identify blocks of zeros

Starting with Data ONTAP 8.3, deduplication performs inline detection on volumes to identify blocks of zeros and makes those blocks available for data to be rewritten, resulting in improved volume performance.

It does not need to be inline-dedupe just enabling post-process dedupe on the HDD only systems is sufficient to enable this feature (volume efficiency on). It is not configurable and is automatically enabled when dedupe is also enabled. To confirm the saving being realised use the command:

storage aggregate show-efficiency -fields volume-vbn-zero-saved

Hope this helps,

Cheers,

Grant.

Re: how cani turn on Inline zero-block deduplication without Inline deduplication pn ONTAP 9.1?

GidonMarcus — Mon, 18 Sep 2017 15:45:22 GMT

cheers. seems right