topic Re: How do Asis and snapshots work in ONTAP Discussions

How do Asis and snapshots work

bader — Thu, 05 Jun 2025 07:20:43 GMT

I am running ASIS and I noticed when I first

ran it I saw a snapshot.

Does Asiis take a snapshot everytime it runs?

In my environment we have non space gaurentted Volumes and Luns. We do not use sanpshots. Because of this my volumes ar eonly a little bit bigger than my luns. My fear if I have a very full lun, and Asis on a voulme, If Asis creates a snapshot when it runs, that snapshoot could interfer with my lun and take it offline? Is this a possblity?

Thanks

Bob

Re: How do Asis and snapshots work

mitchells — Tue, 08 Dec 2009 21:35:51 GMT

Bob,

A-SIS only takes a snapshot when start runs with the -s flag. All A-SIS updates are start commands without the -s flag and do not take snapshots.

Thanks,

Mitchell

Re: How do Asis and snapshots work

bader — Wed, 09 Dec 2009 17:33:18 GMT

Mitchell,

Did you mean "All A-SIS updates are start commands WITHOUT the -s flag and do not take snapshots." Since A-SIS only takes a snapshot when start runs with the -s flag I would assume snapshots happen with updates.

Bob

Re: How do Asis and snapshots work

mitchells — Thu, 10 Dec 2009 14:39:42 GMT

Bob,

I fixed my post. The snapshot is not needed because A-SIS just reads the change journal when a sis start command is issued to know which blocks need to be deduplicated.

Thanks,

Mitchell