[SOLVED] unRAID memory usage?

I recently upgraded from 1GB of memory to 4GB after I was having some random (and frequent) hanging issues.  The memory upgrade seems to have fixed that issue, but since then I've been monitoring the memory usage via unMenu system info button and it typically displays as below.  Is that normal?  Seems like a huge percentage of memory being "used" when there's basically nothing going on on the server.  I have a few packages installed, and Crashplan, but nothing major.  When I look at "Top Processes", nothing shows more than 1.6 in the %MEM column and it doesn't seem to jive with the information below at all.

I'm on version 4.7.

Memory Info
(from /usr/bin/free)
             total       used       free     shared    buffers     cached
Mem:       3888972    3767576     121396          0      59172    3510712
-/+ buffers/cache:     197692    3691280
Swap:            0          0          0

Yes it's normal. Unused memory is wasted memory. Linux uses memory as buffers for the filesystem or file operations. It will be released should any application need memory. Your report shows 3691280 used for buffers/cache that's immediately available for applications should they need it.

Thanks for clearing that up BRiT.  Good to know.