Specifications

CHAPTER 6 Performance Tuning and the VMware GSX Server Host
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power on a virtual machine and there is not enough memory available, a warning
appears and the virtual machine fails to power on.
To increase the number or memory size of virtual machines that can run, adjust the
amount of virtual machine memory that the host operating system may swap to disk.
To change this setting, choose Host > Settings > Memory and choose an option
under Additional memory.
Select one of the following options:
• Fit all virtual machine memory into reserved host RAM — Strictly apply the
reserved memory limit set in the top of the dialog box. This setting imposes the
tightest restrictions on the number and memory size of virtual machines that
may run at a given time. Because the virtual machines are running entirely in
RAM, they have the best possible performance.
• Allow some virtual machine memory to be swapped — Allow the host
operating system to swap a moderate amount of virtual machine memory to
disk if necessary. This setting allows you to increase the number or memory size
of virtual machines that can run on the host computer at a given time. It may
also result in reduced performance if virtual machine memory must be shifted
between RAM and disk.
• Allow most virtual machine memory to be swapped — Allow the host
operating system to swap as much virtual machine memory to disk as it wants.
This setting allows you to run even more virtual machines with even more
memory than the intermediate setting does. In this case, too, performance may
be lower if virtual machine memory must be shifted between RAM and disk.
If you try to power on a virtual machine and there is not enough memory available,
GSX Server displays a warning message. The message shows how much memory the
virtual machine is configured to use and how much memory is available. You can try