ESX round robin IO operations Limit parameter for P4300

[marcin_w]

Hello

I configured my 2 x P4300. I am getting a better transfer rate than on the MSA2012i which I currently use for ESX boxes.

The question is:
Have you changed the IO operetion limit for the Round Robin? I've read that it is good practice to change it in order to improve the performance. The suggested value for Dell/EqualLogic is 3. Any suggestion for P4300?

Thanks.

[Bart_Heungens]

Hi,

All info can be found in this document:
http://h41112.www4.hp.com/promo/master_ESS-Trilogy-4/uk/en/pdf/Documentations/Virtualization/Running%20VMware%20vSphere%204%20on%20HP%20P4000%20SAN.pdf

And yes, Round Robin is the way to go!


Kr,
Bart

[marcin_w]

Hi

Thanks for reply. I read this document before I started configuring the P4300. Unfortunatelly, it does not provide answer to my question.

Marcin

[Bart_Heungens]

Hi,
All the installations I did upto now I never changed this value. I never heard before either that this one needed to be changed in Lefthand environments...

Kr,
Bart

[Christophe Van Lierde]

I tried this tweaking in a test environment setup and was getting a some gain in iops for a "RealLife-60%Rand-65%Read" test (about 5%).
Gains can be larger is pure sequential IO.

In production environment, I leave this setting to default (1000).

[marcin_w]

Thanks for all replies!