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Browse Prior Art Database

Media Statistics for Tape

IP.com Disclosure Number: IPCOM000106982D
Original Publication Date: 1992-Jan-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 2 page(s) / 76K

Publishing Venue

IBM

Related People

Chaloupka, JA: AUTHOR [+3]

Abstract

Customers need to determine the quality level of tape media used in a tape drive/system. The quality of the media has a direct impact on the performance of the tape drive/system and customer satisfaction. (Image Omitted)

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 53% of the total text.

Media Statistics for Tape

       Customers need to determine the quality level of tape
media used in a tape drive/system.  The quality of the media has a
direct impact on the performance of the tape drive/system and
customer satisfaction.

                            (Image Omitted)

      In order for a customer to determine the media quality, the
host system needs to be able to interpret media conditions.  This can
be accomplished with statistics that are written to the tape media as
the tape media is used by the tape drive.  This invention provides
the necessary statistics and how they are updated and accessed for
usage by a host system.

      The invention defines the following:
1.  Area on tape where media statistics are written and updated
2.  The media statistics which should be logged
3.  The mechanism to update and retrieve the statistics for usage by
the host system.
LOCATION OF MEDIA STATISTICS

      The media statistics are located on the media itself. An area
of tape that can be easily updated and retrieved is necessary to
minimize time spent locating the information and sending it back to
the host.  To meet this criteria the media statistics should be
written at the beginning of a data track which is at the "Beginning
of Tape" side of the media spool.  Refer to the figure.  The
statistics may be written on track zero just after the cartridge
identification (ID) information.  Enough space should be reserved on
the tape media to allow for future updates and up to 5 rewritten
copies.

      This area on tape is called the Statistics Partition. A
partition is defined by SCSI-2 (Small Computer System Interface - 2,
ANSI X3.131- 198X) as an area on tape that can be accessed by the
host and has specific starting and ending locations.
STATISTICS LOG

      The statistics which are logged for each tape cartridge in the
Statistics Partition are as follows:
      NOTE:  Statistic counts are accumulative over the life of the
tape unless stated for a...