DRS does not perform vMotion when problems occur on the cluster.
DRS never performs vMotion for the following reasons:
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DRS is disabled on the cluster.
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The hosts do not have shared storage.
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The hosts in the cluster do not contain a vMotion network.
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DRS is manual and nobody approves the move.
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DRS seldom performs vMotion for the following reasons:
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Loads are unstable, or vMotion takes a long time, or both. A move is not appropriate.
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DRS seldom or never migrates virtual machines.
DRS moves virtual machines for the following reasons:
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Evacuation of host that a user requested enter maintenance or standby mode.
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VM/Host DRS rules or VM/VM DRS rules.
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Reservation violations.
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Load imbalance.
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Power management.
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DRS migration threshold is set too high.
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