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3PAR - Can I safely assign all usable CPG space to a FPVV?

 
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sambell
Occasional Advisor

3PAR - Can I safely assign all usable CPG space to a FPVV?

Dear all,

we are running a 3PAR 8200 that currently has 59% of its SSD space allocated:

3par-1.PNG

 

Our SSD CPG shows usable space of 4.416GB:

3par-2.PNG

 

We are only using fully provisioned volumes. Can I safely assign all usable CPG space to a new volume despite that the RAW SSD will reach 100% then?

I once have heard that the 3PAR will stop IO if the RAW capacity will reach over 95%. Is that true or not? The only hint in the documents I found is that if CPGs are overprovisioned, writes to TPVV or snapshots will fail if no space is available anymore. I haven't found hints that state we cannot allocate all usable CPG capacity for FPVV however.

ThanksMichael

1 REPLY 1
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N_JK
HPE Pro

Re: 3PAR - Can I safely assign all usable CPG space to a FPVV?

Hi Sambell,

If you are provisioning FPVVs, you can provision all the space available on the CPG, and host IOs will not fail.

However if there are snapshots / TPVVs available on the array, and if the array doesnt have any space for the TPVVs to grow, then the host IOs for that VV might fail / respective snapshot might go into stale state.

As a best practice, its recommended to keep atleast 10% free space.

Thanks and Regards,

N_JK

I am an HPE Employee

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