RHEL 5.1 (32 bit) shows 3GB RAM though there's 16GB physical
sunhux G
sunhux at gmail.com
Thu Dec 24 04:01:16 UTC 2009
Hi Chaps,
rpm -qa | grep -i pae gave
kernel-PAE-2.6.18-53.el5
& ls -d /boot/vm* gave
vmlinuz-2.6.18-53.el5
vmlinuz-2.6.18-53.el5PAE
& /etc/grub.conf has both the above.
So can I say the best thing to do now is :
comment out in grub.conf the non-Pae entry so that by default
it boots up from the PAE kernel & nobody would accidentally
boots up from the non-PAE
Also, is there any impact to Oracle & web applications
if I boot up from the PAE kernel? Any precautions?
Thanks
On Wed, Dec 23, 2009 at 7:39 PM, Ramakrishnan Seshadhri <
ramakrishnan42 at gmail.com> wrote:
> Hi Sunhux,
>
> As I told you earlier you need to install PAE kernel so that Linux shows
> the
> correct memory.
>
> Install these packages
>
> kernel-PAE-2.6.18-128.1.14.el5
> kernel-PAE-2.6.18-164.el5
> kernel-PAE-2.6.18-128.1.1.el5
>
> They are present in the Linux DVD under "<DVD DRIVE>\server" directory.
>
> Once you install this follow the below steps
>
> 1. Install the RPM
> 2. Reboot the system
> 3. during the boot loaded screen press arrow keys
> 4. Here you will find 2 options, one with the normal Kernel and one with
> PAE
> 5. Choose the PAE kernel version and press enter.
> 6. Now your system should load the PAE kernel and the memory shows up.
> 7. Use "free" command to check the physical memory.
>
> Hope this helps. Once your memory is showing correctly go to grub.conf to
> set the PAE kernel as the default option to boot your system. If you dont
> do
> that everytime you reboot it will take the normal kernel and your phy.
> memory will not show up again.
>
> Regards,
> Ram
>
>
> On 12/23/09, ESGLinux <esggrupos at gmail.com> wrote:
> >
> > Hi,
> >
> > just one thing, in my servers with 32 bits I need to install de kernel
> PAE
> > as they have said you:
> >
> > uname -a
> > Linux server 2.6.18-164.el5PAE #1 SMP Tue Aug 18 15:59:11 EDT 2009 i686
> > i686
> > i386 GNU/Linux
> >
> > rpm -qa | grep -i pae
> > kernel-PAE-2.6.18-128.1.14.el5
> > kernel-PAE-2.6.18-164.el5
> > kernel-PAE-2.6.18-128.1.1.el5
> >
> > I think you need this kind of kernel, I don´t know why other servers show
> > you the memory correctly
> >
> > Greetings
> >
> > ESG
> >
> > 2009/12/23 sunhux G <sunhux at gmail.com>
> >
> > > For other RHEL servers that shows the RAM amt correctly,
> > > "uname -a" & "dmesg" show the following :
> > >
> > > # uname -a
> > > Linux SvrWith_8GBRam 2.6.9-67.0.7.ELsmp #1 SMP Wed Feb 27 04:48:20 EST
> > 2008
> > > i686 i686 i386 GNU/Linux
> > >
> > > # dmesg | grep -i mem
> > > 8320MB HIGHMEM available.
> > >
> > >
> > > For the "weird" server, the uname, dmesg & top are as follows :
> > > (I'll collect "dmidecode | grep -e Memory\ Device$ -A5" tomorrow)
> > >
> > > # uname -a
> > > Linux SvrWith_3GbRam 2.6.18-53.el5 #1 SMP Wed Oct 10 16:34:02 EDT 2007
> > i686
> > > i686 i386 GNU/Linux
> > >
> > > # dmesg | grep -i mem
> > > 3200MB HIGHMEM available.
> > > 896MB LOWMEM available.
> > > Memory for crash kernel (0x0 to 0x0) notwithin permissible range
> > > HighMem zone: 819200 pages, LIFO batch:31
> > > Memory: 3365612k/4194304k available (2080k kernel code, 40228k
> reserved,
> > > 869k data, 220k init, 2489644k highmem)
> > > Freeing initrd memory: 2468k freed
> > > MEM window: f2000000-f5ffffff
> > > MEM window: f6000000-f60fffff
> > > MEM window: disabled. <== anything wrong with this?
> > > MEM window: disabled. <== anything wrong with this?
> > > MEM window: disabled. <== anything wrong with this?
> > > MEM window: disabled. <== anything wrong with this?
> > > MEM window: disabled. <== anything wrong with this?
> > > MEM window: disabled. <== anything wrong with this?
> > > MEM window: disabled. <== anything wrong with this?
> > > MEM window: disabled. <== anything wrong with this?
> > > highmem bounce pool size: 64 pages
> > >
> > >
> > > top - 00:18:20 up 3 days, 12:32, 2 users, load average: 0.14, 0.07,
> > 0.02
> > > Tasks: 155 total, 1 running, 154 sleeping, 0 stopped, 0 zombie
> > > Cpu(s): 0.0%us, 0.2%sy, 0.0%ni, 99.8%id, 0.0%wa, 0.0%hi, 0.0%si,
> > > 0.0%st
> > > Mem: 3369208k total, 3284572k used, 84636k free, 185648k
> buffers
> > > Swap: 8193108k total, 200k used, 8192908k free, 2756496k cached
> > >
> > >
> > > # more /proc/meminfo
> > > MemTotal: 3369208 kB
> > > MemFree: 84760 kB
> > > Buffers: 185668 kB
> > > Cached: 2756484 kB
> > > SwapCached: 0 kB
> > > Active: 508672 kB
> > > Inactive: 2635140 kB
> > > HighTotal: 2489644 kB
> > > HighFree: 12244 kB
> > > LowTotal: 879564 kB
> > > LowFree: 72516 kB
> > > SwapTotal: 8193108 kB
> > > SwapFree: 8192908 kB
> > >
> > >
> > > On Wed, Dec 23, 2009 at 8:35 AM, Ramakrishnan Seshadhri <
> > > ramakrishnan42 at gmail.com> wrote:
> > >
> > > > Hi,
> > > >
> > > > What is your Linux Kernel Version. Is it a PAE kernel (Physical
> Address
> > > > xtension)
> > > >
> > > > Provide the output of # uname -a.
> > > >
> > > > If your kernel is not a PAE kernel it wont detect your physical
> memory
> > > more
> > > > than 3072 MB.
> > > >
> > > > Hope it helps your situation.
> > > >
> > > > Ram
> > > >
> > > > On Tue, Dec 22, 2009 at 10:32 PM, Eugene Vilensky <
> evilensky at gmail.com
> > > > >wrote:
> > > >
> > > > > >> why is "top" or "dmesg" showing only 3GB RAM
> > > > > >> instead of 4GB if 4GB is the max the 32 bit RHEL
> > > > > >> can support?
> > > > > >>
> > > > > >> Supposedly there's 16GB physical RAM inserted
> > > > > >> in the hardware
> > > > >
> > > > > Could you copy/paste your exact top output as well as the output of
> > > > > "dmidecode | grep -e Memory\ Device$ -A5"
> > > > >
> > > > > --
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