At 01:07 -0600 on 02/02/2006, Bruce Hewson wrote about Re: Mount a tape:
Volume mounts can be done manually or the system can automatically do it for you. Manual mounts are done via Console Operator command. Automatic mounts are performed when allocation requires a volume not currently mounted.
You missed AVR (Automatic Volume Recognition) Mounts where is where the operator just places the tape in an unused tape drive (as opposed to mounting it which will keep it on the drive after use). So long as there are enough spare drives to handle the automatic mounts, the operating system will ignore the drive until a job asks for the volume (at which point it will be allocated and get used as if it were requested by auto mount [ie: unloaded after use]).
In the war story area, I remember a new data center that was opened on a high numbered floor of a building and had non-IBM Brand Tape Drives. As soon as they went live, they started to have problems with the drives which at about 4:30 PM every day would unmount all the tapes (Actually just spilling the tape loops into the vacuum columns) and keep doing it until about 5:00 PM. It took engineers from the tape drive supplier to find the "defect" [which was confused by the fact that the first day they were there it did not occur]. It was finally "fixed" by putting up window shades on the windows opposite the drives. At 4:30 the Sun would be reflected off the glass walled office building across the street into the Data Center (except that first day when it was raining/cloudy) and into the Tape Columns which used Light Cells not Air Jets [like the IBM Drives] to monitor the location of the Tape Loops.
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