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3PAR Capacity shows different numbers
https://www.3parug.com/viewtopic.php?f=18&t=1203		 Page 1 of 1
Author:  nsanap [ Wed Mar 04, 2015 7:53 pm ]
Post subject:  3PAR Capacity shows different numbers
Hi,

If I check Provisioning->Virtual Volumes->Summary it shows me below numbers
Virtual Size - 116,216 GB
Reserved User Size - 67,276 GB
Used User Size - 61,006 GB
However, If I go and check System - >Capacity it shows different number and it's not even close to what it shows under virtual volume
Please check attached screen shot for system-> capacity.
I thought it should show same numbers in Reserved user size as system -> capacity-? totoal allocated to volumes.
Cna you please advsie why there is big difference in both numbers.
I have attached two screen shot for your ref. One for total capcity and one from virtual volume.

Attachments:
3PAR Virtual volume summary total size.png
3PAR Virtual volume summary total size.png [ 96.78 KiB | Viewed 16052 times ]
Total Capacity System Capacity.png
Total Capacity System Capacity.png [ 39.68 KiB | Viewed 16052 times ]
Author:  afidel [ Thu Mar 05, 2015 5:09 pm ]
Post subject:  Re: 3PAR Capacity shows different numbers
Keep clicking on the arrows under capacity, it will give you an explanation of where the space is being used.
Author:  nsanap [ Thu Mar 05, 2015 7:45 pm ]
Post subject:  Re: 3PAR Capacity shows different numbers
afidel wrote:
Keep clicking on the arrows under capacity, it will give you an explanation of where the space is being used.


Cna you please tell me the differnece between Reserved User Size, Used User Size nad raw Reserved User Size?
Our Raw Reserved User size is same as the total allocated space.
Author:  apol [ Fri Mar 06, 2015 1:18 am ]
Post subject:  Re: 3PAR Capacity shows different numbers
We are struggling with this as well. Especially management-reporting is difficult, and I still haven't found the command or place in the IMC where the total usable capacity of a storage array (when using only one cpg) is shown, especially when there already are vvs on the system. You have to get that from presales from their ninja whatever tool.

Total raw reserved is the space for the vv taken away from raw freespace with RAID overhead included. Especially if using RAID10 this number can look dramatic...

Total reserved: VV-Space, including some additional space for new writes to land on.

User used: Space actually used for the vv data. Note that even this will never match numbers seen from the host due to inherent efficiency (zero detect et al) and unefficiency (deleted files on host still need space on vv if not unmapped) when using tpvvs or tdvv.

Not sure if dynamic spare stuff is accounted to one of those three, or if this is only seen on system- or cpg-level. Unsure about copy space as well...
Author:  RitonLaBevue [ Fri Mar 06, 2015 6:08 am ]
Post subject:  Re: 3PAR Capacity shows different numbers
Did you ever read HP 3PAR Concept Guide ?
Then you must...
Author:  giladzzz [ Sun Mar 08, 2015 3:53 am ]
Post subject:  Re: 3PAR Capacity shows different numbers
hi

Virtual = Used + Compaction Savings


Compaction Savings = Dedup Savings + Thin Savings
Thin Savings = Thin Provisioning/Persistence Savings + Zero-detect Savings

Spare space is not included in any of these numbers.

Regards
Author:  JohnMH [ Mon Mar 09, 2015 3:38 am ]
Post subject:  Re: 3PAR Capacity shows different numbers
Nsanap / Apol

There are various ways to get the information you require, take a look at this document on space consumption, it should help. https://db.tt/O1foi8RO

Also new thin whitepaper (Feb 2015) here that covers pretty much everything.
http://h20195.www2.hp.com/v2/GetPDF.asp ... 987ENW.pdf

And as above read the concepts guide, once you understand the architecture you'll realise why what you're asking for isn't as simple as it may seem upfront.
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