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Browse Prior Art Database

Automatic Tape Backup of Customer's Critical Direct Access Storage Device Areas

IP.com Disclosure Number: IPCOM000118289D
Original Publication Date: 1996-Dec-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 66K

Publishing Venue

IBM

Related People

Andriola, HM: AUTHOR [+9]

Abstract

Disclosed is a Direct Access Storage Device (DASD)/tape channel/control unit which can automatically backup critical customer DASD data to tape when the data is changed. The channel/control unit monitors the area on the DASD where the critical customer data resides and automatically creates a tape backup of the DASD area when the data is updated.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Automatic Tape Backup of Customer's Critical Direct Access Storage
Device Areas

      Disclosed is a Direct Access Storage Device (DASD)/tape
channel/control unit which can automatically backup critical customer
DASD data to tape when the data is changed.  The channel/control unit
monitors the area on the DASD where the critical customer data
resides and automatically creates a tape backup of the DASD area when
the data is updated.

      This invention provides automatic backup to tape of critical
customer DASD information soon after that information has been
updated.  The backup is transparent to the application running and
requires no human intervention to initiate the backup other than
changing the data.

      The controller is configured with a set of rules which allow it
to identify the critical customer DASD area.  When the system is
powered on, the controller searches for the customer data and sets up
the area on  the DASD to be monitored.  The status of the DASD and
tape backup is saved in battery-backed memory.

      The automatic backup function in the intelligent controller
monitors the critical data area on the DASD and will backup the
critical data area to tape, if needed, after the critical data area
is written during the next period of inactivity.

      Rules are needed to determine when the DASD has been inactive
and how long to wait between creating tapes.  These rules should be
adjusted for the customer application and be part of the
configuration data.  This invention determines that the DASD was
inactive after 30 minutes without a write and limits tape creation to
onc...