Swap space with 12G memory

[zhicheng wang]

hi, the redhat rule of thumb is:

1. for RAM < 2G, 256MB < SWAP = 2RAM
2. for RAM > 2G, SWAP = 4 + (RAM-2), in your case
SWAP=4+(12-2)=14G
3. SWAP partition<2G

so for 14G SWAP, you need 7*2G swaps, i.e. you need 7
partitions of 2G each.

cheng

--- Steven Jones <Steven.Jones at vuw.ac.nz> wrote:
> 
> > > What is the swap space recommended for
> > > RH Enterprise 3 for 12G of memory. Currently we
> are using 4G.
> 
> Depends on the core dump. If you have 12 gig of ram
> and do a core dump
> and it fills the dump partition the machine may not
> reboot properly.
> 
> For normal running I would suggest 1 or 2 gig of
> swap is heaps, in
> reality if you use more than 500meg you are usually
> screwed anyway.
> 
> > > 
> > > 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.
> 
> I tend to agree.
> 
> This rule of thumb was current when a machine had 32
> or 64meg of main
> ram, it has little justification these days IMHO.
> 
> 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".
> 
> My only concern is the core/kcore, I have had cores
> 100% a partition and
> the machine is then unstable. Advice off the
> application vendor might be
> useful, but from experience the helpdesk people you
> will talk to will
> not really know.
> 
> Regards
> 
> Thing 
> 
> 
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Best wishes
Z C Wang

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