Solution providers upgrading network operating systems often run into compatibility problems. Many verticals use a specialized piece of software or a database that only works on an older version of Windows or under another operating system altogether, such as NetWare or Linux.
In those cases, solution providers have been forced to run two servers--keeping the old server online for that one legacy application--or pursue expensive software upgrades. That alone could lead a potential customer to shy away from upgrading at all.
Now virtual technology software from VMware or Microsoft allows a server to share its hardware with multiple operating systems. And with small-business markets saturated with custom vertical applications, virtual servers are a natural fit.
Of course, using a virtual server-based solution increases the cost of an upgrade, but many find the overall expense to be preferable to attempting to upgrade legacy applications.
Before diving into a virtual machine solution, several factors that affect performance will have to be considered. First, virtual machines can tax the processor and RAM. Solution providers need to consider moving the server up to a multiple processor system and adding RAM. Calculating RAM requirements is relatively straightforward. Just add enough RAM for each virtual machine to run effectively.
Also, make sure to add enough disk space to accommodate the needs of each client operating system.
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