ITpro published a review about the X4275 with " Sun Microsystems Sun Fire X4275 storage server review "
The X4275 puts forward a strong proposition as a storage server as it has a high potential capacity and plenty of room to expand.
Overall the review is positive, but i find some of the the nits they are picking a little bit strange like a missing graph for power consumption. Is such a graph on the iLOM really something you want, when you get the history on the console? I would process something like that centrally via Cacti or similar tools for a graphical representation.

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