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Deduplication Storage percent in use

Created: 01 Aug 2013 • Updated: 02 Aug 2013 | 3 comments
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Setup : Windows 2008 R2 SP1 CASO and MS running Backup Exec 2010 R3 SP2

2 Dedupe pools attached via iSCSI

We have two deduplication pools that are both heavily utilised. The first one is at 81% usage and the second is around 70% usage.

My question is at what percentage should we class them as full ? I know from using Avamar (EMC) that 65% is classed as full and this is the stage where more storage needs to be added otherwise certain cleanup tasks may not run effectively.

I have already checked online and cannot find any mention of this at all.


Jon Logan

Operating Systems:

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teiva-boy's picture

Technically it's 80% is when the avamar console warns you, 85% is when bad things start to happen.  The 65% number is I thin kwhen factoring in the OS binaries, etc.  Where as the 85%+ number is based on the actual usable space of the data store.  But that is not what this is about....

In the old PureDisk days, it's capacity was 65% I believe.  But since being ported to Windows, and the PureDisk builds changing over time, it has gone up.  That said, I wouldn't get it over 85% myself.  Symantec didn't make THAT many improvements to the PureDisk binaries to trust them fully.

There is an online portal, save yourself the long hold times. Create ticket online, then call in with ticket # in hand :-) "We backup data to restore, we don't backup data just to back it up."

VJware's picture

These are the default %s ~

Low disk space - 25% free

Low disk space warning - 15% free

Low disk space critical - 5% free

Ofcourse, you can set customized limits (preferably a bit higher), but these are the default values.

MusSeth's picture

Please have a look at the article below hope this answers your question