[K12OSN] Quick Question about Swap partitions

R. Scott Belford scott at hosef.org
Fri Aug 3 18:01:58 UTC 2007

Interesting Note.  For my home mail/web/familytree server, I have my 
swap mirrored across RAID1 on two separate drives.  Some time ago either 
the drives or the cables or the ide channels died.  This mobo has 6 ide 
channels, and my RAID arrays are spread amongst them, so the system is 
still working.  It has no swap and usually uses most or all of its RAM.


Huck wrote:
> No such thing as too much swap...it just won't get used.
> but back in the old days of linux your swap was double your RAM...
> now days...you should be able to tune it(because we have SOOOOO MUCH RAM 
> available now) to have just as much as you'd need...
> I seriously doubt you will ever touch 10GB of swap with 16GB of RAM 
> already in the machine...perhaps 2 GB..
> Jim Kronebusch wrote:
>>> It depends on the use pattern, but on machines I've seen as you get 
>>> close to 2 gigs into swap the machine will be so slow and 
>>> unresponsive that you'll probably reboot it before it would recover - 
>>> if it ever does.  The main point is that you need enough RAM. Swap 
>>> will keep the machine from crashing if you run short momentarily but 
>>> its not a real substitute.
>> So then theoretically is there a problem with having too much swap 
>> available?  I want to
>> be sure I have enough in a just in case scenario, but if too much will 
>> also slow things
>> down I want to keep it to a minimum. 
>> For example let's say you have a system with 16GB RAM and a 2GB swap, 
>> would this perform
>> any differently than a machine with 16GB RAM and 10GB swap?  If both 
>> perform the same,
>> and you have enough space, wouldn't the setup with more swap be safer 
>> if a sudden high
>> use case came about?  Obviously if events kept repeatedly using all 
>> the RAM and digging
>> deep into swap usage, you would add more RAM for the future and hope 
>> to stay out of swap
>> completely.

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