I cannot! 100G is already used by memcached!
something sound very weird to me with the ram requirements you suggest here.
if you look carefully in the data you will see that my working set => the actual data my application needs is less than 250G. all i actully need is 250G ram the rest can be brought from the disk according to the LRU algorithm.
the problem is that this cluster cannot perform rebalance while the application is up. so what you actually
saying is if you want to rebalance you must have 1.3T+ cluster?! isnt that sound exaggerated?!