Noss wrote:
I think the first thing to understand is an EMC Storage Pool is not the same as a 3PAR CPG. Where with Storage Pools you are physically allocating space to be able to create volumes from, a CPG is just a template, with rules on how to organise data (in 1GB Chunklets) across physical drives. When you first initially create a CPG, it doesn't allocate any space.
What capacity is available via your CPG depends what settings you have on it. E.g. Disk Type, Set Size. The CPG will only draw from that space on a need basis determined by growth increment and volume usage within the CPG. Capacity(chunklets) not required and free can be used for other CPGs if it matches the same disk type. Hence why the same physical drives can support different RAID types.
The CPG estimated maximum size figure is based on the capacity available if you were to continue drawing space from it using the same CPG template. Though remember, other CPGs could be using the same available space.
The CPG capacity used figure is based on what has actually been allocated to that CPG for use of volume space and cannot be used by anything else.
The CPG free figure is the space available from what has been allocated to the CPG and volume data written.
If more space was required in the CPG to allow for volume growth, then more capacity(chunklets) would allocated to support it. Allocation size is controlled by the Growth Increment settings
The showsys -space cli command will show you a Free Initialized figure. This is available to existing/new user/copy CPGs.
Unfortunately, Managing HPE 3PAR StoreServ III goes into detail about capacity.
So I have a CPG that is used for all my volumes on one of my 3Pars..
FC_r1: Fast Class 10K / Raid 1..
Used: 1,726 GiB
Free: 50 GiB
Growth limit: 2,458 GiB
Estimated maximum CPG size: 2,150 GiB
When I look at all the volumes in that CPG and add up the "Total Used" it is the 1,726 GB.. How am I to easily see how much space is available in the SAN?
Thanks for the replies..