Fujitsu Server GS21 is ranked 3rd in Mainframes while IBM Z Systems is ranked 1st in Mainframes. Fujitsu Server GS21 is rated 0.0, while IBM Z Systems is rated 10.0. On the other hand, the top reviewer of IBM Z Systems writes "Provides processing of mission critical applications". Fujitsu Server GS21 is most compared with , whereas IBM Z Systems is most compared with IBM LinuxONE, Unisys ClearPath Dorado and Unisys ClearPath Libra.
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