IBM System Storage DS3500 Introduction And Implementation Manual page 487

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Figure 15-13 Save security Key file
Tip: The best practice is to store the security key file with your key management policies
along with the pass phrase. It is important to record and remember where this file is stored
because the security key file is required along with pass phrase when a drive is moved
from one storage subsystem to another or when both controllers in a storage subsystem
are replaced at the same time.
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Chapter 15. Disk Security with Full Disk Encryption drives