Based on the performance testing, minimum memory required to run tendrl server is 4GB. This needs to be adjusted in the prechecks(from the current value of 16GB)
See more details below:
The prechecks playbook checks the size of total memory like this:
ansible_memtotal_mb >= 15000
This ansible_memtotal_mb fact is based on MemTotal field from
/proc/meminfo of remote host, which is defined as (see man proc):
Total usable RAM (i.e. physical RAM minus a few reserved bits and the kernel
binary code).
So if we just check the exact number for 4 GiB:
ansible_memtotal_mb >= 4096
that will fail for machine with exactly 4 GiB ram, because MemTotal on such
machine will be bit smaller.
For this reason, we need to do this check with a smaller number, taking the
reserved kernel bits into account. But
Here is a little list of observations (all done on RHEL 7, x86_64 machines):
mbukatov
commented
6 years ago
Based on the performance testing, minimum memory required to run tendrl server is 4GB. This needs to be adjusted in the prechecks(from the current value of 16GB)
See more details below:
The prechecks playbook checks the size of total memory like this:
This
ansible_memtotal_mbfact is based on MemTotal field from /proc/meminfo of remote host, which is defined as (see man proc):So if we just check the exact number for 4 GiB:
that will fail for machine with exactly 4 GiB ram, because MemTotal on such machine will be bit smaller.
For this reason, we need to do this check with a smaller number, taking the reserved kernel bits into account. But
Here is a little list of observations (all done on RHEL 7, x86_64 machines):
So based on all this, I would suggest to check with 3700 MiB (to be extra save with the limit):