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Number of Volumes on a CPG
Posted: Thu Dec 08, 2011 12:23 pm
by JoJoGabor
Just read in the guide that a CPG can have up to 64 volumes but it is not recommended to have more than 32. My client is running 69 off one CPG!!!!
What's the impact of having more than 32 volumes? This seems quite low to me. Is it not best practice to have only a few CPGs with as amany spindles as possible in those?
Re: Number of Volumes on a CPG
Posted: Mon Dec 12, 2011 5:21 am
by Christian
The limit is not 64 volumes.
A Common Provisioning Group (CPG) creates a virtual pool of logical disks that allows up to
4,095 virtual volumes to share the CPG's resources and allocates space on demand
The impact of having many volumes in a CPG is that it will take ages to tune it if you ever need to do that.
So its preferred to have many CPG's instead of one big one.
Re: Number of Volumes on a CPG
Posted: Sat Dec 24, 2011 1:22 am
by Richard Siemers
That was changed between inserv version 2.24 and 2.3. For 2.24 and older the 32 VV per CPG recommendation is valid.
You can have 1, or 20, cpgs with access to every spindle in the system. CPGs are not like raid groups.
Multiple cpgs can use the same spindle.
Re: Number of Volumes on a CPG
Posted: Sun Dec 25, 2011 11:07 am
by 3parguy
Hello
Every time you have a question about a configuration and you need to know if it is supported or not, please refer to the latest version of the Config Matrix.
I don't give you any figure because I don't know anything about your system.
Some configs out of the Config Matrix may work, but it's recommended to avoid them if you can.
Re: Number of Volumes on a CPG
Posted: Thu Jun 21, 2012 2:04 am
by joepleurs
What are best practices for 3.1.1 considering max number of CPG's on a 3PAR P10000 and max number of virtual volumes per CPG ?