Article ID: 5993, created on Jan 30, 2009, last review on Aug 12, 2014

  • Applies to:
  • Virtuozzo hypervisor 3.0 for Mac


Q1:  Does Parallels Server support SCSI devices?
A: Parallels Server supports virtual SCSI devices (hard drives and optical drives) via a virtual SCSI controller only.  Physical SCSI controllers are currently not available for use in Parallels Server virtual machines (PS VM). 
A virtual SCSI controller can be added in the Parallels Management Console configuration editor.  After booting the VM, connect the virtual floppy drive to the device.fdd image file located in /Library/Parallels/Tools directory and use the device drivers from that image to install the virtual SCSI controller.

Q2:  How to assign an USB device to a specific Parallels Server virtual machine?

A: Currently it is impossible to set a permanent assignment of any USB device to a particular Parallels Server virtual machine.  It will be added as a feature in one of the next builds.

Q3:  Is it possible to migrate a physical Exchange server to Parallels Server virtual machine? What sort of performance lags can it cause?
A: Parallels Server Transporter is able to migrate existing Windows 2000, Windows 2003 and Windows 2008 servers with Microsoft Exchange running on them. No significant variations in virtual Exchange server performance are expected as compared to physical one.  Assume a 5% hit due to network I/O.

Q4:  Is it possible to utilize Parallels Desktop for Mac version 4 virtual machine images with Parallels Server version 3?
A: Parallels Server version 3 doesn’t support all of the guest OSes available in Parallels Desktop version 4. Still, a working Parallels Desktop 4.0 virtual machine with one of the supported operating systems installed can be easily added to Parallels Server for Mac 3.0 hardware node. 
Here you can find a complete list of OSes supported by Parallels Server version 3:

Q5:  I have noticed that while Windows 2003 server images have somewhat normal readings in the server performance tab, Windows 2000 server images have memory utilization pegged at 100%. What should I check?

A: Please, check the following:
-            If the memory in Task Manager of the Parallels Server Windows 2000 virtual machine is also reported inaccurately;
-            How much memory you have allocated to the machine;
-            Allocate more memory and see if the performance tab usage stabilizes.

Q6:  Can the sum of all virtual machines memory exceed the physical memory of the host?

A: Yes, Parallels Server version 3 allows to over-commit both processors and memory resources of the host, and still leave enough of them for the host to operate normally.

Q7: Why I need to choose between SCSI and IDE interfaces? What is the difference between them?

A: Beside the interface difference between IDE and SCSI, IDE provides ability to connect only four device like hard drives and CD/DVD drives, SCSI provides ability to connect  up to 15 devices. 

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