IPDS error recovery: Unrecoverable problems
Unrecoverable problems cause the InfoPrint Manager software or printer software to stop functioning or prevent them from communicating with each other. Examples of unrecoverable errors include: server system crash, software core dump, printer abort, power failure, or severe network problems.
These errors prevent the InfoPrint Manager software from obtaining current station counter status information from the printer. In these cases, InfoPrint Manager cannot determine how many pages and which jobs printed since the last set of valid station counters were received. InfoPrint Manager considers a job complete only when all pages are reported by the printer as stacked. In most cases, some pages for one or more jobs will print between the time InfoPrint Manager last received a printer acknowledgment and the time the unrecoverable error occurs.
Those jobs, because they are considered incomplete, will normally start printing from the beginning when the problem is resolved and both the InfoPrint Manager software and the printer are operating and communicating again.
However, if the submitter or operator does not want the job to start printing from the beginning, there is a way to modify where printing starts for the documents in these jobs. The document object page-select attribute can be modified before the job is processed again. This attribute allows the submitter to specify a page range (first to last) for each document in a job. This way, the submitter or operator can control which pages are printed after the problem is resolved.
Another way to modify where the printing starts is to set the sheet-range job attribute before the job is processed again. This attribute allows the submitter to specify a sheet range (first to last) for the whole job. This way, the submitter or operator can control which sheets are printed after the problem is resolved.
Depending on the type of error and the network configuration, some errors might not be reported to InfoPrint Manager immediately. In these cases, an operator can issue a pdshutdown command to the actual destination object. This command works without any attempts to communicate with the printer. InfoPrint Manager will checkpoint the job that was partially stacked at the printer and use the station counters from the last valid acknowledgment to determine which page of which job to checkpoint. A small ack-interval value will make it possible to checkpoint using a more recent set of station counters than would be available with a large ack-interval value. The job can be resumed later from that checkpoint.
Some unrecoverable errors are reported immediately to the InfoPrint Manager software and the actual destination object (printer) is disabled. When this occurs, the pdshutdown command cannot be issued and therefore no checkpoint can be taken. InfoPrint Manager does not perform automatic checkpointing.