Navisphere cli is a command line interface tool for emc storage system in storage subsystem (clariion, vnx, etc), it is very important to. It will be the nasadmin account it's default password is nasadmin.
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Navisphere cli is supported on emc vnx, cx, cx3, cx4, and the navisphere cli version should be matched with the block software. More detailed post on fast cache: 'emc vnx – fast cache' drive form factor reference:: vnx® command line interface reference for block.