Re: [Xen-users] RHEL 5.2 Xen Kernel doesn't detect all amount of physical memory

[Sadique Puthen <sputhenp@xxxxxxxxxx>]

Ido Levy wrote:
> Hello All,
>
> Does anyone know what is the current status of RHEL 5.2 x86_64 with respect
> to the maximum amount of RAM detected by the Xen 64 bit kernel
> (the one that shipped with Red Hat distribution )
>
> In the following link
> https://www.redhat.com/docs/manuals/enterprise/RHEL-5-manual/en-US/RHEL510/Virtualization_Guide/ch-virt-hw-support.html
> it states that 32GB of RAM is the maximum amount of physical memory the Xen
> kernel can detect. Is it still the updated status ?
>   

>From RHEL-5.2 release note at
https://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5.2/html/Release_Notes/x86_64/ar01s06.html

"The hypervisor can now support up to 512GB of memory. To ensure that
the system properly detects and uses this much memory, boot the
virtualized kernel with the parameter |xenheap_megabytes=64|."

There is currently a limitation of 16GB memory on 32 bit hypervisor. So
u should use a 64bit version of RHEL to see all the 64GB of memory.

--Sadique

> Is there a work around or any other way to overcome this limit ?
>
> Any info would be appreciated
>
> Thanks,
>
> Ido
>
>
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> http://lists.xensource.com/xen-users
>
>   


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