[CentOS] Upgrade ram and what to do with SWAP PARTITION ?

Thu Feb 14 01:45:27 UTC 2008
Masters IT Gmail <mastersit.com at gmail.com>

Thanks again, i did the change, i follow this steps :
http://www.linuxtopia.org/online_books/centos5/centos5_administration_guide/
centos5_s1-swap-adding.html#s2-swap-creating-file

But I setup bs=1M count=1024  this I learn it from:
https://help.ubuntu.com/community/SwapFaq#head-75ffcb00cefe143fc380f84d7ea92
03f16a596d0
I like it more to do it that way.

Later I reboot my PC and run the command free, it seems that now I am using
my newly created swap file, what a nice start. My linux experience is
starting to like it more, thanks to all for your help, thoughts and time!

George from Uruguay.

-----Mensaje original-----
De: centos-bounces at centos.org [mailto:centos-bounces at centos.org] En nombre
de Ross S. W. Walker
Enviado el: Miércoles, 13 de Febrero de 2008 11:10 p.m.
Para: CentOS mailing list
Asunto: RE: [CentOS] Upgrade ram and what to do with SWAP PARTITION ?

Masters IT Gmail wrote:
> 
> Sorry i miss that link that you give me i am reading now 
> thanks for the tip
> i am going to try. Thanks for all!
> 
> -----Mensaje original-----
> De: centos-bounces at centos.org 
> [mailto:centos-bounces at centos.org] En nombre
> de Michael A. Peters
> Enviado el: Miércoles, 13 de Febrero de 2008 06:07 p.m.
> Para: CentOS mailing list
> Asunto: Re: [CentOS] Upgrade ram and what to do with SWAP PARTITION ?
> 
> Masters IT Gmail wrote:
> > Now that I understand that i need more ram after i add this 
> ram to my
> > centos, what I need to do in order to increase my swap 
> partition, thanks
> in
> > advance.
> 
> How much swap do you currently have?
> You may not need to increase swap at all.
> 
> If you do - I haven't tried this method in CentOS (or any OS) but it 
> should work:
> 
> https://help.ubuntu.com/community/SwapFaq#head-75ffcb00cefe143
> fc380f84d7ea92
> 03f16a596d0
> 
> It creates a swap file instead of a swap partition. Much easier than 
> finding unpartitioned space ...

Yes and with today's kernels it provides the same level of performance.

# dd if=/dev/zero of=/.swapfile bs=1M count=512

# mkswap /.swapfile

fstab:
/.swapfile        swap                    swap    defaults        0 0

Or if you use lvm, turn swapoff the lv, lvresize the lv, mkswap the lv
again, then swapon the lv and you have a larger swap, but the swapfile
will at least be contiguous.

-Ross

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