"Active/passive means that one controller is active to process I/O requests, while the other is idle in standby mode ready to take over I/O activity should the active primary controller fail or be taken offline.
An active/active configuration enables both controller nodes to process I/Os, and provide a standby capability for the other."
Ref:
Active/active vs. active/passive arrays
(http://searchstorage.techtarget.com/answer/Active-active-vs-active-passive-arrays
)
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