Up to Discussions in Deduplication

This Question is Possibly Answered

1 "correct" answer available (10 pts) 2 "helpful" answers available (5 pts)
1,020 Views 3 Replies Last post: Feb 4, 2010 5:22 AM by anthonyfeigl RSS
sschmitt NetApp Employee Novice
sschmitt
6 posts since
May 29, 2008
Currently Being Moderated

Jul 2, 2009 7:47 AM

Why should we disable dedupe when using Protection Manager?

Hi,

 

I have a question regarding the documents on NOW:

http://now.netapp.com/NOW/knowledge/docs/ontap/rel7311/html/ontap/rnote/rel_notes/concept/c_oc_rn_lim-dp-sv-protmgr-dedupe.html

 

..

Do not use Protection Manager 3.7 on volumes that have deduplication enabled.

..

 

Okay, I know OM 3.7 is not aware of Dedupe. But it is still possible to do backups with dedupe enabled on the primary side.

My Customer found this and is asking if this also applies for the PM in 3.8 Version.

 

Additional question is...

Do we need Provisioning Manager license for future Protection Manager installs, if we want to use dedupe on primary and secondary snapvault relationship? (got something in my mind from talking with PMs)

Radek Kubka Guru
Radek Kubka
563 posts since
Jul 31, 2008
Currently Being Moderated
Jul 2, 2009 8:41 AM in response to: sschmitt
Re: Why should we disable dedupe when using Protection Manager?

I think the only rationale behind that recommendation (I'd treat that as a recommendation) is explained on that page:

if snapshots exist, de-dupe will 'release' duplicate blocks & the youngest (if my memory servers OK) snapshot will be grown by exactly the same size as de-dupe 'saving'.

 

But this issue is not specific by any means to just Protection Manager.

 

Regards,

Radek

David Warburton Novice
David Warburton
3 posts since
Sep 7, 2009
Currently Being Moderated
Feb 4, 2010 5:02 AM in response to: Radek Kubka
Re: Why should we disable dedupe when using Protection Manager?

I'm sure I've heard that de-dupe is much improved for Snapshots in DOT 7.3.2 (which we're running). Does this mean that this recommendation/limitation no longer applies?


We're also runnuing DFM 3.8.

 

Thanks.

anthonyfeigl Master
anthonyfeigl
51 posts since
Mar 12, 2009
Currently Being Moderated
Feb 4, 2010 5:22 AM in response to: David Warburton
Re: Why should we disable dedupe when using Protection Manager?

David,

 

I think you will find that Dedupe has just changed the way in which it stores it database and not improved on how it does the actual post process work.

Snapshots are still a major factor when deduping volumes.

 

You may want to reference this thread.

 

http://communities.netapp.com/message/21982#21982

 

Anthony

More Like This

  • Retrieving data ...

Bookmarked By (0)