View the Library State
The status bar at the top of the interface displays library health, which represents the combined state of every component in the library.
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Operative — the library is fully operational.
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Degraded — a device in the library has failed or is offline, but the library can continue to function (such as a faulty drive).
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Failed — a device has failed and the library cannot function (such as a failed robot).
Note:
Clicking the library state in the status bar displays the Library Health pop-up which you can use to troubleshoot the library (see Determine the Possible Cause of a Degraded or Failed Library State).