I'm trying to understand huge page in oVirt, I'm quite sure to understand it well. I have an host with 128GiB. I have configured reserved huge page: cat /proc/cmdline ... hugepagesz=1GB hugepages=120 $ grep -r . /sys/kernel/mm/hugepages /sys/kernel/mm/hugepages/hugepages-1048576kB/nr_overcommit_hugepages:0 /sys/kernel/mm/hugepages/hugepages-1048576kB/nr_hugepages:120 /sys/kernel/mm/hugepages/hugepages-1048576kB/nr_hugepages_mempolicy:120 /sys/kernel/mm/hugepages/hugepages-1048576kB/surplus_hugepages:0 /sys/kernel/mm/hugepages/hugepages-1048576kB/resv_hugepages:0 /sys/kernel/mm/hugepages/hugepages-1048576kB/free_hugepages:120 /sys/kernel/mm/hugepages/hugepages-2048kB/nr_overcommit_hugepages:0 /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages:0 /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages_mempolicy:0 /sys/kernel/mm/hugepages/hugepages-2048kB/surplus_hugepages:0 /sys/kernel/mm/hugepages/hugepages-2048kB/resv_hugepages:0 /sys/kernel/mm/hugepages/hugepages-2048kB/free_hugepages:0 I have a big VM running on it: <custom_properties> <custom_property> <name>hugepages</name> <value>64</value> </custom_property> </custom_properties> <memory>68719476736</memory>, aka 65536 MiB <memory_policy> <guaranteed>34359738368</guaranteed>, aka 32768 MiB <max>68719476736</max> </memory_policy> And it keep failing when I want to start it: /var/log/ovirt-engine/engine.log:2018-11-14 12:56:06,937+01 ERROR [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (default task-66) [13c13a2c-f973-4ba2-b8bd-260e5b35a047] EVENT_ID: USER_FAILED_RUN_VM(54), Failed to run VM XXX due to a failed validation: [Cannot run VM. There is no host that satisfies current scheduling constraints. See below for details:, The host XXX did not satisfy internal filter HugePages because there are not enough free huge pages to run the VM.] The huge page fs is mounted: $ findmnt | |-/dev/hugepages1G hugetlbfs hugetlbfs rw,relatime,pagesize=1G | `-/dev/hugepages hugetlbfs hugetlbfs rw,relatime What am I missing ?