[CentOS] Centos Virtual Machine 32 bit with 8 GB ram ?

Roland RoLaNd r_o_l_a_n_d at hotmail.com
Tue Sep 14 10:56:00 EDT 2010


Crystal clear!
thank youuuu..!!

Though another Q if possible..

i've done the following:

yum install kernel-pae

vim /etc/grub.conf
#outputs the following:

# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /boot/, eg.
#          root (hd0,0)
#          kernel /vmlinuz-version ro root=/dev/VolGroup00/LogVol00
#          initrd /initrd-version.img
#boot=/dev/sda

default=0 #############BOOTING with PAE for additional RAM on 32 bit######
timeout=1 ###speeding things up######
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS (2.6.18-194.11.3.el5PAE)
        root (hd0,0)
        kernel /vmlinuz-2.6.18-194.11.3.el5PAE ro root=/dev/VolGroup00/LogVol00 rhgb quiet
        initrd /initrd-2.6.18-194.11.3.el5PAE.img
title CentOS-base (2.6.18-92.el5)
        root (hd0,0)
        kernel /vmlinuz-2.6.18-92.el5 ro root=/dev/VolGroup00/LogVol00 rhgb quiet
        initrd /initrd-2.6.18-92.el5.img


After booting, the system hangs on: 

"Memory for crash kernel (0x0 to 0x0) notwithin permissible range" for about 2 to 4 minutes.
and then continue booting with the following marked as failed:


1. Mounting HGFS shared
2. VM communication interface
3. VM communication interface socket family
4. blocking file system
5. Virtual printing daemon

Are there related errors to PAE itself, or is it just that VM tools do not support PAE kernel?

thanks

Date: Tue, 14 Sep 2010 15:58:15 +0200
From: l.wandrebeck at gmail.com
To: centos at centos.org
CC: r_o_l_a_n_d at hotmail.com
Subject: Re: [CentOS] Centos Virtual Machine 32 bit with 8 GB ram ?

On Tue, 14 Sep 2010 16:45:50 +0300
Roland RoLaNd <r_o_l_a_n_d at hotmail.com> wrote:
 
> 
> Thanks for your feedback..
> 
> So if i set my VM to 8 GB, each proccess would use a max of 3 GB (even with PAE  installed and selected on boot)?
PAE allows a 32 bits host to see more than 4GB of ram. but each process
is still limited to ~3gb. To dive a bit more into technical details,
PAE is like EMS in DOS time. In EMS, you saw the whole ram, but
couldn't allocate more than 64KB per process. With PAE, the same, with
a limit of 4GB-OS stuff per process, so it gives something like 3GB.
Hope I'm clear.
-- 
Laurent Wandrebeck
GPG fingerprint/Empreinte GPG: F5CA 37A4 6D03 A90C 7A1D  2A62 54E6 EF2C
D17C F64C

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