Hitachi NAS Platform 4000 Series Hardware Reference Manual page 21

All storage enclosures are fitted with optical SFP transceivers. The transceivers that
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are approved for use with supported storage enclosures vary depending on the unit.
The transceivers qualified for older systems might not be approved for use with the
most current storage systems. To ensure proper operation of the server and the
storage subsystems, use only the approved replacement parts for each system. See
Hitachi Vantara Support Connect for technical details about replacement parts.
Maintain backup routines. Do not abandon backup routines. No system is completely
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foolproof.
Hitachi NAS Platform and Hitachi Unified Storage Series 4000 Hardware Reference
Chapter 2: Safety information
Data protection precautions
21