Brent Gardner wrote:
Actually, I wasn't aware of the VMware page in the QMail-Toaster wiki
until it was linked in this thread, and I haven't had time to more than
glance at it.
It's new (like a week old), and still under construction. Chip in if you
like!
My toasters are each on a separate VM server along with at least two
other guests. The hardware machines are Dell OptiPlex with 1 Core2Duo
E6850 and 4GB RAM. Some key settings in the Dell BIOS:
Virtualization: (ON)
"This field specifies whether a Virtual Machine Monitor (VMM) can
utilize the additional hardware capabilities provided by Intel(R)
Virtualization Technology."
VT for Direct I/O: (ON)
"This field specifies whether a Virtual Machine Monitor (VMM) can
utilize the additional hardware capabilities provided by Intel(R)
Virtualization Technology for Direct I/O."
If I remember right these settings mean I'm using VT.
I believe that's correct.
The host OS is 64-bit CentOS 5.3. On top of that I have 64-bit VMware
Server 2. The guest OS that QMail-Toaster is installed on is 32-bit
CentOS 5.3.
Each toaster guest is given one virtual CPU and 1GB RAM. The toaster
guest machine files are on a separate drive from the host OS.
I had seen time sync issues a few years ago when first running Linux
guests in VMware on Linux hosts. Research at that time led me to this
document: http://www.vmware.com/pdf/vmware_timekeeping.pdf
That document was created in 2006 so there may be better information
now, but based on that document I put 'clocksource=pit' at the end of
the kernel line in /etc/grub.conf on my toaster guests, disabled any
Linux tyme sync technology such as ntpd, installed VMware Tools and
configured them to sync the guest clock with the host clock. The clocks
on my toasters drift a bit but I don't think they're ever more than a
minute off.
Yeah, I think that's "old school". Check out the link on the wiki. I
think those recommendations probably work better.
I don't recall any other special settings on the toaster guests due to
running as VMs.
Thanks Brent. That's a good picture what you're running. Be sure to have
a look at the wiki. We think the settings identified there are fairly
complete. We are still working on the narrative parts. I use the term
'we' loosely, as Phil is presently working more on it than I am. I plan
on doing some more editing soon though.
--
-Eric 'shubes'
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