In the early 70's I had a client -- large insurance company -- that was running DOS on a 360/50. At some point they lost a 2314 volume. When they restored from backup the restored volume was unusable. Investigation revealed that for some reason lost in the fog of time the sysprog who had set up the backup of the original 2311 volumes had hard-coded the 2311's "tracks 0-9" in the DOS JCL EXTENT statement. They had continued using the same JCL unchanged when they upgraded to 2314s, which of course had 20 tracks per cylinder. The reason the restored volume was unusable was that they had only been backing up the top half of each volume.
Same moral: make sure that your backups actually will restore. Charles ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
