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Data Protector Express User's Guide and Technical Reference
Barcodes and Cartridge Memory
If the tape library supports barcode and/or cartridge memory, the details are added to the Data Protector
Express catalog. The barcode information is hidden by default; to display this detail, right-click anywhere
in the column title row to see available column headings and click on
Media bar code
to make the
barcode information visible in the slots view.
Barcode and cartridge memory technologies are used to reduce the time spent organizing and managing
media in a library or an autoloader. In these devices, each medium is identified with a unique barcode or,
where cartridge memory is used, a chip is embedded in the tape cartridge which holds a unique identifier
(as well as other information).
Barcodes and cartridge memory enable Data Protector Express to significantly reduce media recognition,
labeling and cleaning tape detection times.
•
Scanning the barcode or cartridge memory of the media is faster, because Data Protector Express
does not need to actually load the media into a drive and read the medium header.
•
A barcode or cartridge memory is a unique identifier for media in the Data Protector Express
catalog. You cannot have duplicate barcodes in your environment.
NOTE:
Cartridge memory is an EEPROM chip that is built into the tape cartridge. It can store tape
identification, diagnostics, status and indexing information. This information is read from the EEPROM
using a radio frequency transmission to allow fast identification of the tape and also location of files on
the medium. Different manufacturers implement cartridge memory differently.
Inventory Process
The traditional loader inventory mechanism is accomplished by running an identify job on all the slots in
a loader. This complete inventory can take a very long time, so Data Protector Express uses a “light
inventory” process. This process consists of:
•
Checking to see if media is present in a slot
•
If it does, and the catalog has a record of a media in that slot then the loader indicates that the media
is “probably” the one indicated by the catalog.
•
If a tape is present but the catalog does not have a record of the media then the status of the slot is
‘Invalid – media not identified’.
The ‘light inventory’ happens when the library driver starts (at service startup or when the driver is
manually started), when the user selects the Initialize command on the load object in the user interface or
when Data Protector Express detects that a user has changed the state of the loader (either by opening the
front door or by using the front panel).
When a slot indicates that the media is “probably” a specific media or is not identified, it may be chosen
for use in a job. When the job loads the tape it makes sure that the tape is really what the catalog says it is
and, if necessary, updates the catalog to indicate what is really there. If the tape is, in fact, not usable
because of the supplied media rules, the tape is re-stowed and another media is tried.
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