Which two statements are true for Predictive DRS? (Choose two.)
A. It balances resource utilization for virtual machines with unpredictable utilization patterns.
B. It integrates DRS with vRealize Operations Manager to balance workloads for virtual machines before resource utilization spikes occur.
C. It balances resource utilization based on a threshold’s algorithm that runs each night.
D. It determines the best placementand balance of virtual machines based on a threshold’s algorithm that runs each night in vCenter Server 6.5 Database.
B, C
B and C are correct! I thought that D might be correct, but the nightly Algorithm does NOT run in (or on) the vCenter DB (even thought Performance Stats are stored there) but it actually runs from vRealize Operations Manager against the VMs, as stated in the “What’s New in VMware vSphere 6.5” Doc on VMware.com;
https://www.vmware.com/content/dam/digitalmarketing/vmware/en/pdf/whitepaper/vsphere/vmw-white-paper-vsphr-whats-new-6-5.pdf
“Resource Management Enhancements
Predictive DRS
Predictive DRS is a new feature that leverages the predictive analytics of vRealize Operations Manager with
the powerful resource scheduler algorithm of vSphere DRS. Together, these two products enable workload
balancing for certain VMs before resource utilization spikes occur, potentially eliminating a great amount of
resource contention that might have occurred in the past.
vRealize Operations Manager runs its dynamic thresholds algorithm nightly against the VMs on which it
collects data. These dynamic thresholds create forecasted metrics for the future utilization of the VMs.
The metrics are then passed to vSphere DRS to determine the best placement and balance of VMs before
resource utilization spikes occur. Predictive DRS helps prevent resource contention on hosts that run VMs
with predictable utilization patterns.”
-Enjoy
I think B-C
Predictive DRS using a combination of DRS and vRealize Operations Manager to predict future demand and
determine when and where hot spots will occur. When future hot spots are found, Predictive DRS moves the
workloads long before any contention can occur.
Each night it runs its Dynamic Threshold calculations which uses sophisticated analytics to create a band of
what is “normal” for each metric/object combination
https://blogs.vmware.com/management/2016/11/predictive-drs.html
It should be B and C, the nightly algorithm runs each night against the VMs on which it collects data. https://blogs.vmware.com/vsphere/2017/01/learning-predictive-drs.html