Is Virtualisation Right for Colo? Post: 302192193

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Special Forums UNIX and Linux Applications Is Virtualisation Right for Colo? Post 302192193 by Karma on Tuesday 6th of May 2008 08:29:29 AM

05-06-2008

Registered User

Is Virtualisation Right for Colo?

Hi guys

I'm going to be moving a linux box into collocation to support the growing demands of my sites and have been trying to figure out if Xen is right for me. I'd appreciate hearing some real-world experience with the overhead involved and the optimal ways to slice up a box. Right now I feel I should either do an all-in-one setup with a hardened installation, use Xen to virtualise services I would normally run on other machines (such as DNS and SQL) and/or use Xen to rent out VPSes.

My main concern is that I don't have unlimited resources on this box, it's a dual p4-style 3.06GHz xeon with HT and 4 gigs of old ddr. So far I am going to need to accommodate the following:
- about 100,000 script-generated page views a day, with room for spikes, floods and other attacks
- dns services for about 30 domains, only three well traveled
- sql
- mail

Is Xen practical for my situation? I'm intrigued by the ability to replace and migrate virtual servers in a snap but not sure if the performance cost makes it more effective than a traditional solution. Any input is appreciated!

Karma

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LEARN ABOUT NETBSD

xpci

XPCI(4) 						 BSD/xen Kernel Interfaces Manual						   XPCI(4)

NAME

     xpci -- Xen frontend paravirtualized PCI pass-through driver

SYNOPSIS

     xpci* at xenbus?
     pci* at xpci?

DESCRIPTION

     The xpci driver is the frontend part of the PCI pass-through functionality that can be used by Xen guest domains to communicate with PCI
     devices.

     From a guest point of view, xpci is similar to a pci(4) bus, except that the guest talks with the PCI backend driver instead of the real
     physical device directly.

     When the host domain is NetBSD, the xpci driver is backed by a pciback(4) driver within the dom0.

SEE ALSO

     pci(4), pciback(4), xenbus(4)

HISTORY

     The xpci driver first appeared in NetBSD 5.1.

AUTHORS

     The xpci driver was written by Manuel Bouyer <bouyer@NetBSD.org>.

SECURITY CONSIDERATIONS

     As PCI passthrough offers the possibility for guest domains to send arbitrary PCI commands to a physical device, this has direct impact on
     the overall stability and security of the system.	For example, in case of erroneous or malicious commands, the device could overwrite physi-
     cal memory portions, via DMA.

BSD
								  January 8, 2011							       BSD