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March 18th, 2014 07:00
Software Capacity or Hardware Capacity
I recently noticed that the node capacity output from status.dpn reports a per node capacity percentage that is different from the overall grid capacity reported from enterprise manager. For example I am seeing 5 (3.9TB) nodes at 54% full on the status.dpn output and in the enterprise manager I am seeing a total capacity of 19.4 TB with a utilization of 83%
I am just trying to make sense of the difference for licensing purposes, what is the best way to differentiate a software capacity (if there is one) vs an actual physical capacity.
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ionthegeek
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March 18th, 2014 07:00
It's probably easier to use the GUI, though if you work with Avamar at the command line all day, every day you get used to 65% meaning "full".
You can divide the status.dpn capacity percentage by 0.65 to find the normalized value on most systems. There are some exceptions (e.g. encrypt-at-rest systems) but I don't want to discuss the mechanics here because it's likely to open a can of worms. Shoot me an e-mail if you're interested in the details.
ionthegeek
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March 18th, 2014 07:00
The capacity percentage listed in the GUI tools is "normalized", where the capacity percentage listed by command line tools like status.dpn is typically not.
The licensed capacity of an Avamar system is 65% of the total physical capacity of the nodes. A 3.9 TB node has about 6TB of logical disk space after RAID but 35% of the storage space on a node is reserved for internal use. This space is mainly used for checkpoint overhead but it also contains the OS files, the Avamar server software, etc..
rob_steele
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March 18th, 2014 07:00
Thanks Ian, so the normalized output in enterprise manager is what I should go off of ?
rob_steele
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March 18th, 2014 07:00
Thanks Ian, I think its too early for me to go into EAR capacity sizing this morning
ionthegeek
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March 18th, 2014 07:00
My pleasure! I don't blame you.