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Appendix C Automatic Drive Cleaning
Media Movement to the Drive
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 hostinitiated 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 is set in the returned status byte and a
subsequent Request Sense returns the appropriate error code.
If the host attempts to move a cartridge to a cleaning cartridge’s home
location while the cleaning cartridge is being used in a cleaning
operation, the Move Medium command fails, a check condition is set in
the returned status byte and a subsequent Request Sense returns a
Cleaning Cartridge Installed status (SK=5 ASC=30 ASCQ=03). The
cleaning cartridge’s original location is not available until either the
library determines that the cleaning cartridge’s location is empty (with an
Initialize Element Status) or the library moves the cleaning cartridge to a
different storage element.
Quantum P4000 and P7000 Libraries User’s Guide
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