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HP 3PAR All Flash

Posted on 2016-08-01
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Last Modified: 2016-08-09
Hi

I am currently working on a project where we are using HP 3PAR 8450 All Flash Arrays for the storage.  I had a few questions about the 3PAR best practices and functionality and was after some advice from anyone who has rolled out the 8450 or the 7450.  

- With regards to using RCIP with SRM, would it be recommended to have a separate CPG for the volumes that will be replicated?  I don't see any reason why as the CPG settings will be the same (RAID type etc) but interested to know the best practice.

- Can I create a single CPG and assign the storage, then create another CPG that is empty and migrate virtual volumes over to it when needed?

- Any best practice advice for CPG creation on the all flash?  Given that it is a single tier and there are no policy requirements what would be the point of multiple CPG's?  Can I just create one and then create more and migrate volumes over after?

I am quite proficient with storage so go as complex as needed

Thanks
Dave
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Question by:DLeaver
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Expert Comment

by:David Johnson, CD, MVP
ID: 41740399
From the top down:
  1. A datastore is located on a Virtual Volume
  2. A Virtual Volume draws its’ space from a Common Provisioning Group (CPG).
  3. A Common Provisioning Group is any given number of Logical Disks joined together to form some sort of contiguous space.
  4. A Logical Disk is simply a collection of chunklets which are joined together in rows in order to produce a certain RAID set (1,5,6,etc).
  5. A Chunklet is a 1GB piece (chunk) of any given physical disk within the array.
  6. Physical disk
Note the terms contiguous
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DLeaver earned 0 total points
ID: 41742212
To be fair, whilst I appreciate the effort to respond this doesn't answer my question and I am familiar with how the above works.  

Via further research I have answered my own questions: -

With regards to using RCIP with SRM, would it be recommended to have a separate CPG for the volumes that will be replicated?  I don't see any reason why as the CPG settings will be the same (RAID type etc) but interested to know the best practice.

A CPG just for RC is not required and has no bearing on the RC and SRM functionality.  It is recommended to have a separate CPG for copy space as it makes snapshot management and storage reclamation much easier to manage.

Can I create a single CPG and assign the storage, then create another CPG that is empty and migrate virtual volumes over to it when needed?


Yes if you are licensed for Dynamic Optimisation.  Some further restrictions will also still apply if you are using Remote copy on said VV as this may need to be paused prior to the VV migration with a potential knock on effect to SRM.

Any best practice advice for CPG creation on the all flash?  Given that it is a single tier and there are no policy requirements what would be the point of multiple CPG's?  Can I just create one and then create more and migrate volumes over after?

As per question 1 answer.  Given that it is a smaller system with a single tier then a minimal amount of CPG's is recommended.
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Author Closing Comment

by:DLeaver
ID: 41748472
I have solved this myself.

Whilst I appreciate the response from the other Expert involved it did not apply to my questions

Thanks
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