StorageTek Host Software Component 6 User Manual

1st ed., 6/30/04 - 312579601

StorageTek provides a way to monitor the reliability of ACS robotics motion. This 
appendix describes what information is logged and how that information is logged.

StorageTek logs robotic motion statistics in three categories: 

• robotic Motion Start Counts 
• temporary Motion Error Counts 
• permanent Motion Errors. 

Each category is described in the following paragraphs. 

Note: Robotic motion start counts and temporary motion errors will only be recorded if 
OPTION LOGGING is set to EXTENDED. 

Each time an LSM robotics motion request is accepted by the LMU, the count of Robotics 
Motion Starts is incremented by one. This count represents the number of times the robot 
attempts to pick up a cartridge at one location, move it, and place it at another location. 
When the Catalog or VIew commands are used, the count is the number of times the robot 
hand is moved to a target location. The Robotics Motion Start Count is incremented at the 
start of each robotics motion. The motion itself may be successful, have a temporary error 
or have a permanent failure.

With the exception of LMU busy retries, motions retried by the HSC are counted as 
additional subsequent motions, since each attempted motion request could result in a 
hardware failure (hard fail) or temporary error. 

For each motion which is successful, but which had a temporary error, the count of 
Temporary Motion Errors is incremented by one. A temporary error is counted against any 
motion that contains a retry at some level which either impacts performance or may 
indicate that hardware is degraded. Temporary errors are currently counted at the LSM 
level against any motion requiring a panel ID recalibration to complete. Temporary errors 
are counted at the LMU level if a motion must be retried.