[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.
> 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
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