topic Re: difference between DEDUPLICATION and COMPRESSION in ONTAP Discussions

difference between DEDUPLICATION and COMPRESSION

Rawat_Sunil — Wed, 04 Jun 2025 22:25:17 GMT

1. What is the difference between DEDUPLICATION and COMPRESSION

2. What is the command for both of them.

3. Is we schedule it?

Re: difference between DEDUPLICATION and COMPRESSION

mikkisse — Wed, 30 Dec 2015 15:52:23 GMT

Hello!

Here is nice document http://www.netapp.com/us/media/tr-3966.pdf

Shortly:

Deduplication does not compress bloks, it keeps one block of data, and other similar blocks presents as link to this block.

You can run deduplication manually, or by schedule.

Compression works only with turned deduplication. If you want to use compression, you must turn on deduplication first.

Compression can be inline and postprocess:

1. Inline - Online compressing your blocks, but slowing perfomance.

2. Postprocess - Compressing blocks by schedule. eg at night or weekend.

Both of this technologies you can turn on at volume's storage efficiency tab in OnCommand System Manager.

Re: difference between DEDUPLICATION and COMPRESSION

Rawat_Sunil — Wed, 30 Dec 2015 16:38:10 GMT

thanks for revert
what is the command for deduplication and compression

Re: difference between DEDUPLICATION and COMPRESSION

mikkisse — Wed, 30 Dec 2015 16:45:55 GMT

You can use volume efficiency command family.

oh, sorry this works at cDOT.

Re: difference between DEDUPLICATION and COMPRESSION

Rawat_Sunil — Sun, 03 Jan 2016 09:11:39 GMT

Compression and postprocess compression not able to implement.

it showing

dr-fas3140a> sis config -C true -I true /vol/vmfs_win003
config: Invalid option - C
sis config [ [ -s schedule ] <path> | <path> ... ]
- Sets up, modifies, and retrieves the schedule of SIS volumes.

dr-fas3140a>