topic Re: What are the functions performed by Control Cache and Data Cache? in HPE 3PAR StoreServ Storage

What are the functions performed by Control Cache and Data Cache?

DA_Carobin — Tue, 24 Apr 2018 13:21:14 GMT

Is there any documentation that details what functions are performed by the Cache Control and by the Data Cache and why the difference in size between them?

Re: What are the functions performed by Control Cache and Data Cache?

Ryan001 — Tue, 24 Apr 2018 13:27:38 GMT

3PAR Storage Architecture

https://h20195.www2.hpe.com/v2/getpdf.aspx/4aa3-3516enw.pdf

3PAR Best Practice

https://h20195.www2.hpe.com/v2/GetPDF.aspx/4AA4-4524ENW.pdf

Re: What are the functions performed by Control Cache and Data Cache?

Ryan001 — Tue, 24 Apr 2018 13:32:08 GMT

Also 3PAR Concepts Guide

https://support.hpe.com/hpsc/doc/public/display?docId=c04204225

data cache
The dual in-line memory modules that support the HPE 3PAR ASIC located in a controller node.

control cache
Memory modules that support the microprocessors located in a controller node

Re: What are the functions performed by Control Cache and Data Cache?

Venkatesh_SL — Tue, 24 Apr 2018 13:49:41 GMT

Well now that you know Data and Control Cache, you can also know what is adaptive cache used in 3PAR?

Refer the below weblink to know that:

HPE 3PAR Adaptive Flash Cache

https://h20195.www2.hpe.com/v2/getpdf.aspx/4AA5-5397ENW.pdf

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Re: What are the functions performed by Control memory and Cache memory?

Dennis Handly — Sun, 29 Apr 2018 05:46:29 GMT

Control memory is just regular CPU memory. The Data cache stores the I/O requests before they are written and satisfies read requests.

shownode will list the sizes.

Re: What are the functions performed by Control Cache and Data Cache?

DA_Carobin — Wed, 25 Apr 2018 13:06:10 GMT

Thanks Dennis in this way I can conclude that the InformOS uses the Cache Control for its operation, File Persona and Compression also use the Cache Control. In the 8000 family how much of the control cache is dedicated to Inform OS?

Re: What are the functions performed by Control memory and Cache memory?

Dennis Handly — Sun, 29 Apr 2018 05:47:03 GMT

> the Cache memory for its operation

Cache memory is used for user data.

> File Persona and Compression also use Control memory.

Yes.

> how much of control memory is dedicated to HPE 3PAR OS?

If you have File Persona installed, 8 GiB is reserved. All of the rest is for the OS.