Swap space with 12G memory

[Smith, Albert]

> -----Original Message-----
> From: redhat-list-bounces at redhat.com 
> [mailto:redhat-list-bounces at redhat.com] On Behalf Of Patricio Bruna V
> Sent: Wednesday, March 16, 2005 7:26 PM
> To: General Red Hat Linux discussion list
> Subject: RE: Swap space with 12G memory
> 
> 
> > > What is the swap space recommended for RH Enterprise 3 for 12G of 
> > > memory. Currently we are using 4G.
> > > 
> > > The app is an LSAP system > 6G of data,
> > > 
> > > JYard
> > > UCLA
> 
> > The Rule of Thumb is normaly 1.5 - 2 times the physical 
> amount of ram.
> that its was they tall you
> > So in your case 18 - 24g of swap. 
> Thats its very stupid.
> why waste so much disk in something not worthy?
> I always says if you have a lot of RAM because you need it 
> (Big DB) and you start to use to much swap (>512) better buy more RAM.
> > I would check to see if your app requires that much ram.
> as far as i know, there is not such thing like "much ram".
> 
> saludos.
> --
> Patricio Bruna
> pbruna at linuxcenterla.com
> Red Hat Certified Engineer
> Jefe Soporte y Operaciones LinuxCenter S.A.
> Canada 239, 5to piso, Providencia, Chile 
> http://www.linuxcenterla.com +56-2-2745000
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> 

> > The Rule of Thumb is normaly 1.5 - 2 times the physical 
> amount of ram.
> that its was they tall you
As I said only a rule of thumb based on my 15 years of experience I
think it's on the mark.
> > So in your case 18 - 24g of swap. 
> Thats its very stupid.
> why waste so much disk in something not worthy?
> I always says if you have a lot of RAM because you need it 
> (Big DB) and you start to use to much swap (>512) better buy more RAM.
If you don't like it don't use it. Don't come here and flame a response
to a question that was asked. I currently run a rules based oracle
datbase with 100 users that requires 20 gig of ram to run, My swap is
about 40 gig and 20% is used. But during peak times I have seen it go as
high as 50%. The reason is not every process can use memory paging so it
needs to page or swap to disk.
> > I would check to see if your app requires that much ram.
> as far as i know, there is not such thing like "much ram".
Yes there is, sizing documents and minimal memory requirements and you
can also by doing something called a load test to support what is in
your enviornment and what you are testing on.

Albert Smith
Sr. Unix Systems Administrator
HPCSA, RHCT
Genex Services
440 E. Swedesford Rd.
Wayne, PA 19087
albert.smith at genexservices.com
(610) 964-5154