Xen devel - Jul 2009 - Xen 64 but supported memory limit

Hello,

We are looking to use Xen as our hypervisor. However, after doing some research
it''s still not clear as to the amount of memory Xen 64bit can support?
The highest I''ve found is 4TB of physical memory. For the host
VM''s, I''ve found several statements that indicated that the
max per VM was 32GB. Are these numbers accurate? And can these limits be removed
or increased?

Thanks,
Dave


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The current limit is theoretically 1TB, but that should be easily
increasible. I think the largest tested memory configuration is 256GB. Max
per VM I think may actually be limited only by available memory.

 -- Keir

On 14/07/2009 21:53, "Chou, David Y" <david.y.chou@lmco.com>
wrote:
> Hello,
>  
> We are looking to use Xen as our hypervisor. However, after doing some
> research it¹s still not clear as to the amount of memory Xen 64bit can
> support? The highest I¹ve found is 4TB of physical memory. For the host
VM¹s,
> I¹ve found several statements that indicated that the max per VM was 32GB.
Are
> these numbers accurate? And can these limits be removed or increased?
>  
> Thanks,
> Dave
> 


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Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel

SLE11 in its current shape is successfully running on a 1Tb system (and the
hypervisor has been validated to work fine with 1Tb for much longer, it was
really the Dom0 kernel that had issues when not passing a dom0_memoption).

And if anyone cares, I''ve got a pretty simple patch to bump the limit
to 5Tb.
Going beyond that will very likely require more extensive changes.

Jan
>>> Keir Fraser <keir.fraser@eu.citrix.com> 14.07.09 23:55
>>>
The current limit is theoretically 1TB, but that should be easily
increasible. I think the largest tested memory configuration is 256GB. Max
per VM I think may actually be limited only by available memory.

 -- Keir

On 14/07/2009 21:53, "Chou, David Y" <david.y.chou@lmco.com>
wrote:
> Hello,
>  
> We are looking to use Xen as our hypervisor. However, after doing some
> research it¹s still not clear as to the amount of memory Xen 64bit can
> support? The highest I¹ve found is 4TB of physical memory. For the host
VM¹s,
> I¹ve found several statements that indicated that the max per VM was 32GB.
Are
> these numbers accurate? And can these limits be removed or increased?
>  
> Thanks,
> Dave
> 


_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com 
http://lists.xensource.com/xen-devel

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