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example, as shown in Figure 7.21, the ESXi host esxi-05 hosts four VMs with a priority of High
and four other VMs with priority values of Medium or Low. Meanwhile, esxi-06 and esxi-07
together hold 13 VMs, but of those VMs only two are considered of High priority. When
esxi-05 fails, the FDM master host in the cluster will begin powering the VMs with a High pri-
ority. If vSphere DRS is enabled, the VMs will be automatically placed on one of the surviving
hosts. However, assume there were only enough resources to power on three of the four VMs
with High priority. That leaves a High-priority VM powered off while all other VMs of Medium
and Low priorities continue to run on the remaining hosts.
Figure 7.20
Use the VM
Overrides setting to
specify which VMs
should be restarted
fi rst or ignored
entirely.
Figure 7.21
High-priority
VMs from a failed
ESXi host might
not be powered on
because of a lack
of resources—
resources consumed
by VMs with a
lower priority that
are running on
the other hosts
in a vSphere HA-
enabled cluster.
Spare
Spare
Spare
Medium
High
Low
Low
High
Medium
Low
Medium
Medium
High
High
Medium
High
Medium
Medium
Medium
Medium
Low
Medium
High
Low
esxi-05.lab.local
esxi-06.lab.local
esxi-07.lab.local
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