Improved Direct Access Storage Device Save/Restore Testing Method
Original Publication Date: 1987-Jun-01
Included in the Prior Art Database: 2005-Feb-01
Ensuring the accuracy of the operation which saves the data from a DASD (direct access storage device) unit onto removable media (magnetic tape) while preserving both the data and the created error conditions on the DASD unit is accomplished by the use of code which simulates the data restore operation. The sequence of steps used during the Unit Test phase of the DASD restore code is as follows: 1.'Condition' the DASD unit for the Save operation as follows: a. Sequence the DASD unit (write a unique sequence number to each sector on the DASD unit). b. Create the error conditions on the DASD unit (datachecks, on-track alternates, off-track alternates, etc.). 2.Execute the Save code to read the data from the DASD unit and write the data to tape. a. Read sectors of data from the DASD.