You need to set CONF.reserved_host_memory_mb to the amount of memory
used by "other VMs not tracked by Nova". In the case of XenServer, the
dom0 counts for a VM not tracked by Nova.
** Changed in: nova
Status: In Progress => Invalid
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Engineering Team, which is subscribed to OpenStack Compute (nova).
https://bugs.launchpad.net/bugs/1642494
Title:
Host memory used for other VMs is not included
Status in OpenStack Compute (nova):
Invalid
Bug description:
The host free memory is always set by this formula: "free = total -
reserved - instances" while the actual consumption will be ignored. If
there are some other VMs also hosted on the host, the resource view
will report an incorrect memory usage, and scheduler will not prevent
instance claiming memory even when there isn't enough available.
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