Quantum P3000 Series, User Manual

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Appendix C Automatic Drive Cleaning
Monitoring the Drives
Quantum|ATL P3000 Series User’s Guide 105
Monitoring the Drives
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In host-initiated cleaning mode, the host is responsible for
monitoring the drives to determine when a drive needs to be
cleaned.
In automatic cleaning mode, the library monitors the drives to
determine when a drive needs to be cleaned.
Each drive “CLEANING_ REQUIRED” flag is checked at the
completion of an inventory.
A specific drive’s “CLEANING_REQUIRED” flag is checked at the
completion of a Move Medium command involving that drive.
Media Movement to the Drive
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When a cleaning cartridge is selected, the library moves it to the
drive requiring cleaning. If the movement operation is not
completed due to an unrecoverable error, the drive cleaning
operation does not proceed, and the library returns the cleaning
cartridge to its original storage element. If an unrecoverable error
occurs when moving a cleaning cartridge that prevents a
subsequent host initiated command from completing, a check
condition is set in the returned status byte and a subsequent
Request Sense returns the appropriate error (such as Transfer
Element Full). Since the drive still indicates that it needs cleaning, a
new drive cleaning operation is attempted.
If a library-initiated cleaning cartridge movement is in progress
and the host issues a command that requires the use of the
transport, the host-initiated command is held until the library-
initiated movement is completed. If an error occurs with the
library-initiated movement, the host initiated command is
processed following the error. If a subsequent error occurs, a check
condition will be set in the returned status byte and a subsequent
Request Sense will return the appropriate error code.