If CA Disk encounters any physical I/O errors during the course of the volume-level backup, the CCHH for the track is saved. At the end of the backup processing, CA Disk writes a record to the archive tape that contains the CCHH for the tracks in error. The number of I/O errors allowed before the volume is bypassed is determined by the sysparm IOERRLIM. For detail information, see IOERRLIMnnnnn in the Systems Guide.
This record of I/O errors is prefixed with a record type of I. The DSNINDEX record Flag2 field is set to x'08', indicating a data set has been backed up with I/O errors.
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