Only schedule instances on hosts if there is sufficient RAM available. If this filter is not set, the scheduler may overprovision a host based on RAM (i.e., the RAM allocated by virtual machine instances may exceed the physical RAM).
This filter can be configured to allow a fixed amount of
RAM overcommitment by using the ram_allocation_ratio
configuration option in nova.conf. The default
setting is:
ram_allocation_ratio=1.5
With this setting, if there is 1GB of free RAM, the scheduler will allow instances up to size 1.5GB to be run on that instance.
![[Warning]](../common/images/admon/warning.png) | Warning |
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