Re: [Xen-users] Using Linux 2.4 custom domu on x86_64 2.6 Xen dom0

[Brian <spatuality@xxxxxxxx>]

>Since you want to run more than 4 1GB DomU on one guest (presumably to
>save hardware cost), I can't really see any way to solve this, as Xen
>2.x doesn't support PAE or x86_64. 

I looked at the source files again, and realized the unstable tarball is 
actually 3.x, not 2.x made to work with pae or x86_64 as I had first thought. 
So right you are: 3.x is the only possible choice in my case.

>The only viable solutions are:
>1. Upgrade your kernel to 2.6.16 or so, and apply the relevant patches
>here. 

That's my next stop. I hoped to delay the recompile of our application servers 
to use 2.6 until a later time, but that delay doesn't seem possible. Time to 
transfer my stumblings into the devel list.

>2. Run fully virtualized (VT/SVM technology) on x86_64 or 32-bit PAE. 

The blades we're using don't have the VT processors in them. Maybe the next 
round will, though from what I have seen on current performance comparisons I 
might want to run paravirtualized anyways.

>3. Run fewer guest per blade (possibly on a less expensive blade-model
>with fewer cores/CPU's and less memory slots).

It's a server per U of rack space issue. Getting 4 virtual servers out of each 
blade instead of 10 will not fly.

Thanks for the clarifications. Onward to upgrading.

Brian





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