Huge Pages Calculator

Calculating the correct minimum size of huge pages reserved for simplyblock isn't an easy task. Therefore, simplyblock provides the following calculator.

The calculator provides the number of 2 MiB sized huge pages.

Huge Pages Calculator

Number of disks:

Max effective storage consumption per node (TB):

Number of logical volumes:

Number of (v)CPUs assigned to Simplyblock:

Minimum required huge pages: 3436

The resulting number can be used for temporary allocation of huge pages or to persist and pre-allocate them during system boot-up.

Temporary allocation

sudo sysctl vm.nr_hugepages=4096

Persisted allocation

GRUB_CMDLINE_LINUX="${GRUB_CMDLINE_LINUX} default_hugepagesz=2MB hugepagesz=2MB hugepages=4096"

Persist the configuration change

sudo grub2-mkconfig -o /boot/efi/EFI/redhat/grub.cfg