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3PAR zero detection

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binu_mathew
Frequent Advisor

3PAR zero detection

Hi EveryOne,

After reading many document of 3PAR thin technologies and 3par architecture, one thing is still not clear for me. What is 3PAR zero detection, Is this actually happens or more efficient when data move from non 3par storage to 3par or with in 3par ?

How it is happeneing with in 3par, if an environemnt with 3par and virtual machine,if I delete a virtual machine, why the space is not allocating back to CPG  without a manual command "tune vv".

Or all the thin technologies, like deduplication/zero detection are applicable only for Thin volumes or is it applicable for thick volumes as well.

Appreciate experts comments ..

3 REPLIES
Dennis Handly
Acclaimed Contributor

Re: HPE 3PAR zero detection

>What is 3PAR zero detection

 

When you write a 16K page of zeros, it is detected by the ASIC.

 

>if I delete a virtual machine, why the space is not allocating back to CPG?

 

If you delete a VV, the storage should go back to the CPG.  Perhaps you need to use compactcpg?

 

>deduplication/zero detection are applicable only for Thin volumes

 

Yes, thin only.

binu_mathew
Frequent Advisor

Re: HPE 3PAR zero detection

So , this mean , 3par reads in 16kiB pages. if the asic found a page with 16kiB , only then it will mark as complete zero right ?

 

Dennis Handly
Acclaimed Contributor
Solution

Re: HPE 3PAR zero detection

>only then it will mark as complete zero right?

 

Yes