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Device recovery | |
The NMS uses all available device features to aid in device recovery,
either automatically (following a device power failure) or manually
triggered by an operator. The CIPER devices support page checkpoints. The spooler uses the
checkpoints to recover quickly to a specific page. Refer to appendix D
for detailed information on checkpoints. The HP 2680, HP 2688, and HP 5000 series perform Page Level Recovery
(PLR), which uses a silent run technique from the beginning of the file
to the point of recovery. The devices's knowledge of pages ensures that
output resumes correctly. Refer to appendix D for detailed information
on Page Level Recovery. A serial printer has no feedback to tell the spooler of its page
location. Output may not resume at the correct page boundary, or the
page boundary may be shifted.
A full discussion of paging exists in the description of the
SPOOLER ...;RESUME command in chapter 4. Spool file recovery | |
The system preserves output spool files for all system startups except INSTALL. Job input spool files have a one-to-one correspondence with job master table (JMAT) entries. The JMAT is still a CM table, so it is still rebuilt for updates and START NORECOVERY. Whenever an update or START NORECOVERY occurs, the system purges all input spool files. The NMS retains output spool files until the device positively notifies the spooler that paper output is in the output station and error free.
See appendix C for more information about recovery. |
