According to Vitesse, the big deal about the VSC120 is that it links directly to the Fibre Channel loop. It does not require a disk drive to act as go-between.
Here's the scoop: Up until now, controller chips used for monitoring have relied on an industry-standard Enclosure Services Interface (ESI) that links an enclosure controller to a specially designated disk drive inside a storage array.
On a prompt from the host computer attached to the array, the designated drive retrieves environmental status info on the overall array and shunts that over the ESI back to the host.
Vitesse says the VSC120 eliminates the need for ESI, instead using the Fibre Channel loop itself as the means of exchanging monitoring information between the storage device and its host server.
The chief benefit of direct attachment, Vitesse says, is that it substantially improves the speed and efficiency of storage monitoring, because it doesn't require any disk drives inside an array to halt their normal activities in order to check status.
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