Overview of add and replace I/O module - AFF C30 and AFF C60
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You can replace a failed I/O module in your storage system with the same type of I/O module, or with a different type of I/O module. You can also add an I/O module to a storage system with available slots.
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Adding additional I/O modules can improve redundancy, helping to ensure that the storage system remains operational even if one I/O module fails.
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Replacing a failing I/O module can restore the storage system to its optimal operating state.