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Hi,
May be I can help you here.
The HA buffer in vRealize Operations 6.7 is not gone. It is auto-calculated and subtracted from Total Raw Capacity.
Hence Usable Capacity = Total Capacity - HA Buffers out of the box and you do not need to set any configurations or policies to consider this buffer.
With 6.7, HA Buffers are automatically read from your HA Admission Control Policy. Since HA buffers are defined for Reserving Capacity in case of HA failures, the source of truth for these buffers are in vCenter HA configuration. Hence if you need to reserve capacity of HA Failover, this should be configured in vCenter HA Admission Control Setting. Have Admission Control disabled or not configured and buffering HA capacity just in vROps is not a good practice since while you think you have enough capacity on a cluster from vROps point of View, your availability policy will not honor that.
Hence in 6.7 we made this configuration out of box and we honour your HA policies based on that
Please refer to out of box "Utilization Overview Dashboard" to get more details.
Hope this helps. If you have more questions or feedback on vRealize Operations 6.7, feel free to reach out to me on duas@vmware.com
Regards
Sunny