More then 16GB with FC6 or FC7?
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Is there any way to make the xen kernel see more then
16GB of ram when its installed on a 32bit OS (either
FC6 or FC7)?
I tried FC7 64bit since it can see all the ram,
however the only 32bit OS I was able to install
successfully was windows XP. Every other distro (FC6,
FC7, and CentOS 4.5 & 5.0) would freeze up at some
point in the installation or bootup section.
I have a machine with 28GB of ram and have a month to
get it running.
Marco Jorge
On Wed, Jun 27, 2007 at 05:00:13AM -0400, thewird wrote:
Is there any way to make the xen kernel see more then
16GB of ram when its installed on a 32bit OS (either
FC6 or FC7)?
No it is an architectural limitation of Xen that 32-bit is limited to
a maximum of 16 GB, even with PAE.
I tried FC7 64bit since it can see all the ram,
however the only 32bit OS I was able to install
successfully was windows XP. Every other distro (FC6,
FC7, and CentOS 4.5 & 5.0) would freeze up at some
point in the installation or bootup section.
I have a machine with 28GB of ram and have a month to
get it running.
64-bit is the way to go. Try toggleing the 'acpi' and 'apic' settings
for the HVM guests as this often helps with lockups.
Dan.
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Daniel P. Berrange wrote:
On Wed, Jun 27, 2007 at 05:00:13AM -0400, thewird wrote:
> Is there any way to make the xen kernel see more then
> 16GB of ram when its installed on a 32bit OS (either
> FC6 or FC7)?
No it is an architectural limitation of Xen that 32-bit is limited to
a maximum of 16 GB, even with PAE.
Well, there is one from the dirty tricks department: Install 32bit fc7,
pull 64bit xen kernel from the 64bit kernel-xen rpm, boot that with the
32bit linux kernel.
Mixing 32bit and 64bit guests isn't going to work for the time being
(needs a kernel update). But with the 64bit hypervisor underneath the
system should be able use all memory, even with 32bit guests only.
cheers,
Gerd
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thewird