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Old 06-19-2012, 10:37 PM
"Hugh E Cruickshank"
 
Default Memory recognition in 6.2

Hi All:

I have an HP DL380G5 server which I am loading CentOS 6.2 on and it does
not appear to recognize all of the RAM installed on the server. The BIOS
is reporting 26GB however top is reporting:

Mem: 15720140k total, 418988k used, 15301152k free, 30256k buffers
Swap: 17956856k total, 0k used, 17956856k free, 135536k cached

and free is reporting:

total used free shared buffers cached
Mem: 15720140 418848 15301292 0 30256 135536
-/+ buffers/cache: 253056 15467084
Swap: 17956856 0 17956856

I have tried adding the mem= parameter to the /boot/grub/grub.conf file
as in:

title CentOS (2.6.32-220.17.1.el6.i686)
root (hd0,0)
kernel /vmlinuz-2.6.32-220.17.1.el6.i686 ro [SNIP]
initrd /initramfs-2.6.32-220.17.1.el6.i686.img
mem=26624M

but this has not appeared to work.

Any suggestions would be gratefully appreciated.

TIA

Regards, Hugh

--
Hugh E Cruickshank, Forward Software, www.forward-software.com

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Old 06-19-2012, 10:51 PM
Scott Silva
 
Default Memory recognition in 6.2

on 6/19/2012 3:37 PM Hugh E Cruickshank spake the following:
> Hi All:
>
> I have an HP DL380G5 server which I am loading CentOS 6.2 on and it does
> not appear to recognize all of the RAM installed on the server. The BIOS
> is reporting 26GB however top is reporting:
>
> Mem: 15720140k total, 418988k used, 15301152k free, 30256k buffers
> Swap: 17956856k total, 0k used, 17956856k free, 135536k cached
>
> and free is reporting:
>
> total used free shared buffers cached
> Mem: 15720140 418848 15301292 0 30256 135536
> -/+ buffers/cache: 253056 15467084
> Swap: 17956856 0 17956856
>
> I have tried adding the mem= parameter to the /boot/grub/grub.conf file
> as in:
>
> title CentOS (2.6.32-220.17.1.el6.i686)
> root (hd0,0)
> kernel /vmlinuz-2.6.32-220.17.1.el6.i686 ro [SNIP]
> initrd /initramfs-2.6.32-220.17.1.el6.i686.img
> mem=26624M
>
> but this has not appeared to work.
>
> Any suggestions would be gratefully appreciated.
>
> TIA
>
> Regards, Hugh
>
It looks like you installed 32 bit OS... I don't think it sees over 16 gigs...



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Old 06-19-2012, 10:51 PM
"Joseph L. Casale"
 
Default Memory recognition in 6.2

> title CentOS (2.6.32-220.17.1.el6.i686)
> root (hd0,0)
> kernel /vmlinuz-2.6.32-220.17.1.el6.i686 ro [SNIP]
> initrd /initramfs-2.6.32-220.17.1.el6.i686.img
> mem=26624M

Do i read that right? 26g of ram and you're using a non PAE x86 kernel?
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Old 06-19-2012, 10:55 PM
Yves Bellefeuille
 
Default Memory recognition in 6.2

On Tuesday 19 June 2012, "Hugh E Cruickshank" <hugh@forsoft.com> wrote:

> I have an HP DL380G5 server which I am loading CentOS 6.2 on and it
> does not appear to recognize all of the RAM installed on the server.
> The BIOS is reporting 26GB however top is reporting:
>
> Mem: 15720140k total, 418988k used, 15301152k free, 30256k
> buffers Swap: 17956856k total, 0k used, 17956856k free, 135536k
> cached


> title CentOS (2.6.32-220.17.1.el6.i686)

I can't find the limit for CentOS 6, but CentOS 5 x86 was limited to 16
Gb of RAM: https://www.centos.org/product.html . You should use x86_64.

--
Yves Bellefeuille <yan@storm.ca>
"La Esperanta Civito ne rifuzas anticipe la kunlaboron de erarintoj, se
ili konscias pri sia eraro." -- Heroldo Komunikas, n-ro 473.
_______________________________________________
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http://lists.centos.org/mailman/listinfo/centos


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Old 06-19-2012, 11:08 PM
"Hugh E Cruickshank"
 
Default Memory recognition in 6.2

From: Scott Silva Sent: June 19, 2012 15:51
>
> It looks like you installed 32 bit OS... I don't think it
> sees over 16 gigs...

Yes it is 32-bit but if there is a 16GB limit on memory then I am
going to need to revert to CentOS 5.

Regards, Hugh

--
Hugh E Cruickshank, Forward Software, www.forward-software.com

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Old 06-19-2012, 11:13 PM
"Hugh E Cruickshank"
 
Default Memory recognition in 6.2

From: Joseph L. Casale Sent: June 19, 2012 15:52
> > title CentOS (2.6.32-220.17.1.el6.i686)
> > root (hd0,0)
> > kernel /vmlinuz-2.6.32-220.17.1.el6.i686 ro [SNIP]
> > initrd /initramfs-2.6.32-220.17.1.el6.i686.img
> > mem=26624M
>
> Do i read that right? 26g of ram and you're using a non PAE
> x86 kernel?

It was my understanding that PAE is now built into the standard kernel
but I will check on this further.

Regards, Hugh

--
Hugh E Cruickshank, Forward Software, www.forward-software.com

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http://lists.centos.org/mailman/listinfo/centos
 
Old 06-19-2012, 11:15 PM
Yves Bellefeuille
 
Default Memory recognition in 6.2

On Tuesday 19 June 2012, "Hugh E Cruickshank" <hugh@forsoft.com> wrote:

> Yes it is 32-bit but if there is a 16GB limit on memory then I am
> going to need to revert to CentOS 5.

Same limit in CentOS 5.

Is there a reason you don't want to use x86_64?

--
Yves Bellefeuille <yan@storm.ca>
"La Esperanta Civito ne rifuzas anticipe la kunlaboron de erarintoj, se
ili konscias pri sia eraro." -- Heroldo Komunikas, n-ro 473.
_______________________________________________
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Old 06-19-2012, 11:22 PM
"Hugh E Cruickshank"
 
Default Memory recognition in 6.2

From: Yves Bellefeuille Sent: June 19, 2012 15:55
>
> I can't find the limit for CentOS 6, but CentOS 5 x86 was
> limited to 16
> Gb of RAM: https://www.centos.org/product.html . You should
> use x86_64.

If that is the case then both CentOS 5 and 6 are not viable for us. I
will have to go for RHEL5 (or possibly 6) which does support the memory
in 32-bit mode.

The reason for the restriction to 32-bit is because of other software
that we must run that does not work correctly on a 64-bit OS.

Regards, Hugh

--
Hugh E Cruickshank, Forward Software, www.forward-software.com

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Old 06-19-2012, 11:51 PM
Scott Silva
 
Default Memory recognition in 6.2

on 6/19/2012 4:22 PM Hugh E Cruickshank spake the following:
> From: Yves Bellefeuille Sent: June 19, 2012 15:55
>>
>> I can't find the limit for CentOS 6, but CentOS 5 x86 was
>> limited to 16
>> Gb of RAM: https://www.centos.org/product.html . You should
>> use x86_64.
>
> If that is the case then both CentOS 5 and 6 are not viable for us. I
> will have to go for RHEL5 (or possibly 6) which does support the memory
> in 32-bit mode.
>
> The reason for the restriction to 32-bit is because of other software
> that we must run that does not work correctly on a 64-bit OS.
>
> Regards, Hugh
>
You can always virtualize...



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Old 06-19-2012, 11:59 PM
John R Pierce
 
Default Memory recognition in 6.2

On 06/19/12 4:13 PM, Hugh E Cruickshank wrote:
> From: Joseph L. Casale Sent: June 19, 2012 15:52
>>> > > title CentOS (2.6.32-220.17.1.el6.i686)
>>> > > root (hd0,0)
>>> > > kernel /vmlinuz-2.6.32-220.17.1.el6.i686 ro [SNIP]
>>> > > initrd /initramfs-2.6.32-220.17.1.el6.i686.img
>>> > > mem=26624M
>> >
>> >Do i read that right? 26g of ram and you're using a non PAE
>> >x86 kernel?
> It was my understanding that PAE is now built into the standard kernel
> but I will check on this further.

If I recall correctly, PAE is limited to 16GB because the page tables
are obscenely huge for more than that, and use over a gigabyte of the
32bit kernel space





--
john r pierce N 37, W 122
santa cruz ca mid-left coast

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