Dell PowerVault TL4000 - Manual (Page 183)

Ensure that the proper device driver, if applicable, is installed for the library.
Note: Many backup applications use their own drivers for the library and drive.
Before installing a driver, make sure it will not be in conflict with the
software. Contact your Backup Application vendor for this information.
Library Recovery Problem Determination
The 2U and 4U library firmware will generally retry failed operations up to three
times before posting a failure to complete the operation, or, in some situations,
proceeding with an operation that can be completed in an alternative manner. Of
course, if the operation is successful within the allotted retry count, the appropriate
retry counter is updated and recorded in the retry log and the next library
operation will commence.
For example, failure to pick or place a cartridge from or to a designated cell or
drive location after exhausting the retry count will result in a failed operation with
the appropriate error code. However, failure to detect a particular cell location by
sensing the prism fiducial located on the cell shelf because it is missing or
damaged will eventually result in the cell location being located by the gripper, bar
code reader and positional emitter pulse count after the prism detection retry
count is exhausted. If several prisms are missing or damaged or if the accessor
prism sensor/emitter is inoperable, initialization and/or inventory functions can
take a prolonged amount of time to complete due to the lengthy retry recovery
procedure.
If the library is taking an extended amount of time to initialize, to perform an
inventory or even move a cartridge within the library, the magazines prism
integrity should be verified prior to exchanging a library component. This situation
can be noted by the ACTIVITY line on the Operator Panel posting Recovery. Prism
integrity verification can be done by releasing the magazines and inspecting the
cell prisms. Normal initialization or inventory time for a 2U library once the picker
mechanism starts its operation should be approximately 1 to 2 minutes. For a 4U
library, 2 to 3 minutes. A single missing or damaged prism can add 1 to 2 minutes.
If the accessor tray sensor/emitter is inoperable, or several prisms are missing or
damaged, initialization or inventory could exceed 30 minutes or longer. Refer to
Troubleshooting table “Cartridge Movement Problems”.
Procedures for Isolating CRU Problems
Isolating a Power Supply Problem
Note: Not all power supplies have LEDs. The original power supply for the 2U
library did not have LEDs though any power supplies replaced will likely
have LEDs. The 4U library has power supplies with LEDs.
Chapter 7. Troubleshooting 7-7