On Wed, Jun 29, 2011 at 5:22 PM, m.roth@5-cent.us wrote:
Les Mikesell wrote:
On 6/29/2011 4:04 PM, Emmanuel Noobadmin wrote:
On 6/30/11, Les Mikeselllesmikesell@gmail.com wrote:
The seriously on-the-cheap approach is to run a few virtual servers on hardware slightly better than one of the individual servers would need.
Actually THAT is the fundamental problem ;) The physical server is frankly much more powerful than the two guest running on it. I have the same applications + public web/email running on old dual core machines with less memory than the guests.
<snip> > OK, but without knowing the cause, you already know the cure. Make the > virtual servers not share physical disks - they will always want a > single head to be in different places at the same time. And there is > also probably some ugly stuff about how using files for virtual disk > images and perhaps LVM on both the real and virtual side makes your disk > blocks misaligned. Fixing that might help too.
Here's another one, that I got from another admin talking to VMware: watch out just how many virtual CPUs you assign to each VM. If you've assigned 4, it is actually going to sit there waiting until it gets 4 virtual CPUs. As of '09, VMware was recommending assigning 2.
mark
This is no longer true [1], but it's still a good idea to only assign as many CPUs as you need.
[1] Source: VMware Engineer at VMware Forum 2011.
-☙ Brian Mathis ❧-