To keep up with user demand and because of the space and power demands of traditional tower and rack-mount servers, data centers are being forced to expand their physical plant at an alarming rate.

为了紧跟用户需求，也因为传统桌上型和机架型伺服器对空间和功率的需求，资料中心必须以惊人的速度扩大物理设备的容量。

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And applications would each run on their own tower of power hardware that was often running in a unique data center rack or racks.

FORBES: Repackage or Reimagine? Virtualization and the Potential for a New Security Regime