Les Mikesell wrote: > On 6/29/2011 4:04 PM, Emmanuel Noobadmin wrote: >> On 6/30/11, Les Mikesell<lesmikesell at 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