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Disk servers are the names given to an environment where a standard server is running disk controller software for captive disk (typically direct attached) to serve up the storage as virtual LUNs. We call this "open platform storage systems."
The disk servers are really storage systems implemented with standard components and disk controller software. They provide the abstraction of the storage they control and typically provide many advanced functions. They can be used in conjunction with NAS gateways and some solutions provide the NAS function in the disk server. These are typically very cost competitive solutions with the performance dependent on the type of server used as a base.
Randy Kerns
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