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Usr Snapshot and Adm Space

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kisalipa
Occasional Contributor

Usr Snapshot and Adm Space

Hi Friends,

I am new to understanding HP 3PAR 10400 and 10800 models we have in our environment.

While trying to understand CPG's, I am not getting what exactly is the ADM space and the exact differences between Snapshot and Usr space. Can someone please give explanation with some example?

I have gone through some docs but not able to figure out the exact meaning.

Thanks in Advance!!

6 REPLIES
Dennis Handly
Acclaimed Contributor

Re: Usr, Snapshot and Adm Space

Check out HPE 3PAR StoreServ Storage Concepts Guide:

http://h20564.www2.hpe.com/hpsc/doc/public/display?docId=c04204225

USR: Contains the data of the base VV

SNP: Contains the changes from the base VV and snapshots

ADM: Contains the metadata that describes what has changed (for snapshots)

kisalipa
Occasional Contributor

Re: Usr, Snapshot and Adm Space

Thanks Dennis for the reply. The ADM space always shows a 0 for FPVV. Any reason for that??

Sheldon Smith
Honored Contributor

Re: Usr, Snapshot and Adm Space

For a Fully Provisioned Virtual Volume, there can be no metadata changes. The entire volume is already there! :)


Note: While I work for Hewlett Packard Enterprise, all of my comments (whether noted or not), are my own and are not any official representation of the company.
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kisalipa
Occasional Contributor

Re: Usr, Snapshot and Adm Space

Thanks Sheldon. So I understand metadata has the information of the actual data(indexes of files or user data) that is filling up the Virtual Volume or the CPG??

What I understood earlier was, if the metadata size or ADM size displayed as 512MB for a 500GB TPVV, I felt it is the increments of 512MB as the data fills up the physical capacity??

Please clarify the confusion.

Sheldon Smith
Honored Contributor
Solution

Re: Usr, Snapshot and Adm Space

Sorry, no. The metadata tracks the changes (growth) of a Thin volume, in 32 MB regions. The user data is in the Usr space (in 128 MB regions). A Fully provisioned volume has no growth, therefore no Adm spaec.


Note: While I work for Hewlett Packard Enterprise, all of my comments (whether noted or not), are my own and are not any official representation of the company.
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If my post was useful, click on my KUDOS! thumb below!
kisalipa
Occasional Contributor

Re: Usr, Snapshot and Adm Space

Thanks a lot Sheldon. Now its clear.

Can you please answer my another post - CPG Growth increments??