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Solved
Memory upgrade for Readynas RN 422
Output from "top" command: top - 20:04:50 up 6 days, 1:46, 1 user, load average: 0.04, 0.06, 0.00 Tasks: 173 total, 1 running, 172 sleeping, 0 stopped, 0 zombie %Cpu(s): 2.5 us, 0.5 sy, 0.0 ...
I'm informed by hardware engineering that on the RN422 and RN424 the RAM is soldered on and so it cannot be replaced.
Check the output from free -m too - top does not show how the memory is actually being used
e.g. on a ReadyNAS 516 with 4GB of RAM:
total used free shared buffers cached Mem: 3838 3634 203 17 1 2935 -/+ buffers/cache: 697 3140 Swap: 1023 0 1023
Only 203MB free - but the vast majority of the RAM is just being used for cache, the real available amount of RAM excluding cached items is 3.1GB, not 203MB...
free -h -s 5
total used free shared buffers cached
Mem: 1.9G 1.9G 63M 2.5M 4.6M 361M
-/+ buffers/cache: 1.5G 429M
Swap: 511M 118M 393M
From what you are saying - this seems to indicate that of the 1.9G - 1.5G is used for cache?
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