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Avamar dedupe ratio?
Im trying to calculate our current dedupe ratio so I can spec for some new data nodes we may need.
I have divided the total bytes by the mod sent from the dpn report to
give a ratios of 1:32 on Grid 1 and 1:47 on Grid 2
Our total usable capacity is 13.7Tb and Total capacity is 19.5TB
The other way I'm calculating the dedupe ratio is by taking the total protected figure and dividing this
by the total capacity (19.5TB)...
(I was dividing the total protected with the usable capacity which gave a dedupe ratio of 20% which didnt seem correct -
I then realised I needed to use the total capacity!)
The figures from the above two methods are slightly out (+-4%)
I'm quite sure the first method is the most accurate
Anyone with any thoughts on this?
thanks
AShah7
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May 7th, 2013 05:00
Just to add to this
By calculating the dedupe ratio using the dpn summary I end up with the above figures
By using the other method lower down the dpn summary figures only make sense if I divide by the total physical capacity (19.5Tb) and not the usable capacity (13.7TB)
We have total protected (undeduped) of 14932GB (both grids replicated) of which 11980GB is protected (deduped) which gives a ratio dedupe ratio of 20%.
These grids are only backing up NDMP.
Not sure why the dpn summary is giving a 1:32 and 1:47 ratio (for each grid) this only works out if you use the total physical capacity
11980/19968GB (total physical capacity) = ratio of approx 40%
Anonymous
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June 10th, 2013 17:00
Your EMC sales team can actually help with computing the DPN Summary info and running a perl script on the utility node to gather this.