Hitachi 3090 G2 Hardware Reference Manual page 19

A loss of data can occur if a hard drive module is removed. Immediately replace any
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modules that are removed. If a module is faulty, replace it with one of the same type,
of at least the same capacity and speed.
Always shut down the system before it is moved, switched off, or reset.
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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 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 3080 and 3090 G2 Hardware Reference
Chapter 2: Safety information
Data protection precautions
19