When you attempt to power on a virtual machine, DRS attempts to migrate it if there is not enough resources on the host on which it is registered. This attempt may fail for various reasons.
The following are the possible reasons:
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DRS is disabled on the virtual machine.
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Virtual machine has a device mounted.
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Virtual machine is not compatible with any other hosts.
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No other hosts have a sufficient number of physical CPUs or capacity for each CPU for the virtual machine.
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No other hosts have sufficient CPU or memory resources to satisfy the reservations and required memory of this virtual machine.
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Moving the virtual machine will violate an affinity or anti-affinity rule.
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The DRS automation level of the virtual machine is manual and the user does not approve the migration recommendation.
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DRS will not move fault tolerance-enabled virtual machines.
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