StorageTek SL150 Modular Tape Library
 

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In this Document

Symptoms

Cause

Solution

References

Created from <SR 3-9463689541>

Applies to:

Symptoms

Since replacing the robot about a month ago we are still having intermittent issues with the robot.

2014-08-13T00:14:03.016,      0.0.1.0.2, 519,            robot, /usr/local/bin/Ifm,  error, 0000, 5093, "Director - putResponse() Slack Detected, Marking Mech 1 non-operational; srv_mech_move:  failed. mcuIfStatus = 1, mechStatus = 12; End of Text"

Cause

According to the logs the robot is not able to move properly, there is an obstruction in the line of movement that is not allowing the free movement of the robot.  The "slack" reported by the robot is the clue that shows us that it has obstructions to move.

 

Solution

- Check for any obstructions in the library that are causing the robot to not be able to move down.

- Check for tapes sticking too far out of the magazines.

- Check that the base and expansion modules are fully seated and aligned.

- Check for any cables that might be in the path of the robot.  If nothing is found then try to park the robot by powering down via the Web GUI and checking the "Park Robot" option. 

 -If that doesn't work then manually park the robot via the procedure documented in the Knowledge doc:
     SL150 - How to Remove/Replace the Robot CRU in a StorageTek SL150 Modular Tape Library:ATR:1473774.1:0 (Doc ID 1473774.1)
                 How to Park the Robot Manually:
                 1. Remove the top tape drive from the base module.
                 2. Locate the bull wheel gear above the top drive slot.
                 3. Place your finger in an indent on the body of the bull wheel gear.
                 4. Turn the gear clockwise to raise the robot.

        Note: Assume that the 12 o’clock position is toward the front control panel.

                 5. Hold the bull wheel gear with the robot fully raised until the robot is locked.
                 6. Reposition the robot lock (loosen the thumb screw, remove the mechanism, rotate the mechanism 180 degrees, insert the mechanism, and tighten the thumb screw).

- Pull the robot out and check it for any loose cables and also for any slack in the suspension cables that the robot assembly hangs from and also check to see if the suspension cables have jumped off of the pullys.  If they have and they cannot easily be fixed then a new robot should be ordered.

- If nothing was found wrong when the robot was pulled out, put the robot back in and unlock it. Pull all of the drives but the bridge drive so you can watch the library initialize.  Power up the library and watch it initialize through the empty drive bays.

- Watch specifically to see if the robot catches on anything during the initialization.  If the initialization completes OK then run the "Full Self Test" with the diagnostic tape.

Final Fix:
The problem was caused by the expansion tray was not latched correctly with the upper main unit, causing the magazine to be crooked. By reinserting the expansion module, this fixed the mechanical problem.

The wire on the original robot was too loose on the right side, this is why the robot needed to be replaced.  The robot was damaged by hitting the bottom magazines.
 

References

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