we have 463 RHEL 7.6 machines in the cluster most of then are HDFS machines ( datanode )
free -g command we can that usually buff/cache is around 30-50 when total memory is 256G
as I know - a buffer is an area of memory used to temporarily store data while being moved from one place to another
but the available memory is also memory that used for application
so I am little confused , what is the diff between buff/cache to available memory ?