Re cached memory, isn't that how all file systems work across all the major operating systems? The kernel space will cache files to reduce disk IO but will imme

Re cached memory, isn't that how all file systems work across all the major operating systems? The kernel space will cache files to reduce disk IO but will immediately free that memory if a requesting application allocated more memory that's what's available in free memory alone. Which is why file servers perform best with ooodles of RAM and why one should always look at both the free + cached memory when calculating available memory on more general purpose systems. Or was your NAS behaving subtly different from the standard above? (eg how ZFS cache doesn't appear as FS cache in ZoL despite freeing in much the same way as the above)