VMware

Enabling SCAv1 Scheduler – Do I need to turn off DRS?

Howdy, folks.

I’m about to turn on the SCAv1 Scheduler in my DR datacenter – Do I need to turn off DRS?

Are there any other considerations (besides the performance hit) I need to worry about?

I’m well versed in the whole thing. I’ve reviewed the KBs ([https://kb.vmware.com/s/article/67577](https://kb.vmware.com/s/article/67577)) and [https://kb.vmware.com/s/article/56931](https://kb.vmware.com/s/article/56931) about the HTA Tool and enabling the SCAv1 by hand.

I was just wondering if VMs might freak out/refuse to vMotion while I’m putting this in place.

Thanks.


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3 Comments

  1. No, you don’t have to disable DRS (it would competely destroy your vCloud director environment if that was a necessity this wil remove your resource pool configuration).

    Please consider implementing SCAv2, this increases the available resources. Where SCAv1 kinda disables hyperthreading by its means of mitigating the cpu bugs. SCAv2 can still use HT when the cores are scheduled for the same VM so data disclosure is no problem.

    [https://www.vmware.com/techpapers/2018/scheduler-options-vsphere67u2-perf.html](https://www.vmware.com/techpapers/2018/scheduler-options-vsphere67u2-perf.html)

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