IBM Storwize V7000, Introduction And Implementation Manual, Page: 339 / 670

Chapter 8. Storage pools
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The internal drives in IBM Flex System V7000 Storage Node can be assigned to several
usage roles, which either can be unused, candidate, spare, or failed:
– Unused: The drive is not member of an MDisk (array).
– Candidate: The drive is available for use in an array.
– Spare: The drive can be used as a hot spare if required.
– Failed: The drive was either intentionally taken offline or failed due to an error.
Click Mark as... in the Actions drop-down menu, and select the role you want the drive to
be assigned to (Figure 8-7).
Figure 8-7 Change a drive’s usage
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Use the Identify action (in Figure 8-7) to turn on the LED light so you can physically
identify a drive that needs to be replaced, or that you want to troubleshoot.
Internal drives: Choosing the option to take internal drives offline could lead to
potential data loss.