16GB RAM -> Swap?

Hi,

I've got a Blade-system with 16GB RAM, but "only"
one 140GB
harddisk. My question is about swap-space: Traditional
knowledge
recommends swap = 2*RAM. This would mean 32GB swap (!).

Should I really go for 32GB swap space? Or will e.g. 16GB (=
RAM-size)
be enough? 

Please note, that I don't do kernel debugging etc. on this
machine -
just a production machine used for network monitoring (Mrtg,
nfsen,
cacti)

TIA for any clue,
-ewald


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EWALD JENISCH WROTE:
> HI,
> 
> I'VE GOT A BLADE-SYSTEM WITH 16GB RAM, BUT
"ONLY" ONE 140GB
> HARDDISK. MY QUESTION IS ABOUT SWAP-SPACE: TRADITIONAL
KNOWLEDGE
> RECOMMENDS SWAP = 2*RAM. THIS WOULD MEAN 32GB SWAP
(!).
> 
> SHOULD I REALLY GO FOR 32GB SWAP SPACE? OR WILL E.G.
16GB (= RAM-SIZE)
> BE ENOUGH? 
> 
> PLEASE NOTE, THAT I DON'T DO KERNEL DEBUGGING ETC. ON
THIS MACHINE -
> JUST A PRODUCTION MACHINE USED FOR NETWORK MONITORING
(MRTG, NFSEN,
> CACTI)

THE ONLY THING YOU WOULD PROBABLY NEED SWAP FOR ON SUCH A
MACHINE IS TO
CATCH KERNEL CORE DUMPS IN CASE SOMETHING GOES WRONG. AND IF
YOU'RE
RUNNING 7.0, THE DUMPS NO LONGER INCLUDE ENTIRE MEMORY SO
YOU'LL NEED
MUCH LESS SPACE (AFAIK, UPTO KMEM_SIZE WILL BE DUMPED, AND
THIS IS
LIMITED TO 2 GB RIGHT NOW).

YOU DON'T NEED ANY SWAP AT ALL, BUT I'D STILL RECOMMEND
SOMETHING LIKE 2
GB, JUST IN CASE.

> Should I really go for 32GB swap space? Or will e.g.
16GB (= RAM-size)
> be enough?

i think your programs will fit in 16GB without problems. so
don't use swap 
at all
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