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Disclosed is a system to protect tape and tape drive mechanism during mid-tape recovery after power on by prohibiting tape motion if tape breakage information is stored in nonvolatile memory on single reel tape drive system.
English (United States)
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Tape protection method after tape breakage in mid-tape recovery system
Figure 1 shows whole drive behavior on conventional mid-tape recovery system after tape breakage.
If power off then power on after tape breakage, mid-tape recovery process is invoked to make drive system ready state. It requires tape motion so that tape and drive mechanism are damaged. It makes problem worse and impacts to failure analysis.
Tape breakage detection MidFlow-Tape recovery
Once tape breakage happens no tape motion accepted. However, ...
Problem: If MTR is executed after tape breakage, tape and drive mechanism are damaged since MTR goes with tape motion.
It makes problem worse and impacts to failure analysis.
Tape breakage then Power OFF/ON
Mid Tape Recovery
Fig 1. Conventional Method
Figure 2 shows whole drive behavior on disclosed system.
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Page 2 of 2
Tape breakage detection Flow
Mid-Tape Recovery Flow
Branch 1. If drive microcode detects tape breakage while operation, it executes tape protection such as prevention of tape motion, displaying error, etc. Besides tape protection, drive microcode sotres tape breakage infromation into nonvolatile memory. Branch 2. After power off then power on, drive microcode checks cartridge is mounted in drive or not. 2n. If cartridge is not mounted, go to 4. 2y. If cartridge is mounted, go to 3. Branch 3. Dri...