More Memory Than Sense
My recent bugbear is - servers with inaccessible memory.
You go and spec a nice new server with say 8Gb of RAM (a little box), you install Debian, you start adding applications to the machine and then a couple of months later some anal sysadmin comes along, does a `free
-m` and mutters about under-specced virtualization servers when he sees
total used free shared buffers cached Mem: 3287 225 3062 0 24 149
For those of you not paying attention - the machine isn’t using over half of it’s memory. So first of all how do you spot this and secondly how do you fix it?
If you’re on Debian then the spotting is easy (for some hardware) -
apt-get install lshw and then run
lshw -class memory | grep -A 4 ‘-memory’
If the size is bigger than the total fromfree` then you’ve got
The fix? Install the right bigmem kernel. And then recompile VMware server. Dammit.