Hardware difference in the same Rack

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Hi Everybody,

It's recommended join different hardwares in the same rack  ?

For example I have a sata rack with Apollo 4200 storage and I will get another hardware type to expand this rack, Hp 380 Gen10.

I was made a lot tests to  understand the performance and these new disks have 100% of utilization in my environment and the cluster recovery is worst than another hardware.

Can Someone recommend a best practice or configuration in this scenario? I  make this issue because if these disks not performing as hope, I will configure another pools to my openstack and maybe that's not make sense to me because I will split nova process in the computes node if I have two pools .

 
Regards,
Fabio Abreu
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