Ipds Job Recovery - Xerox DocuPrint 100MX User Manual

Getting started

IPDS job recovery

In order to understand IPDS job recovery (the completion of an IPDS job
after a fault condition), it is important to understand that IPS Gateway
marks pages as committed/stacked once they are successfully written to
the DocuSP queue socket connection. If the segmentation feature is in use,
IPS Gateway marks all the pages in the segment as committed/stacked
once the last page in that segment is written to the socket. At this point, the
IPDS host considers the pages printed and DocuSP is responsible for
printing all pages in the job. The IPDS host software is responsible for
recovering up to the last page reported as stacked by IPS Gateway.
Therefore, the combination of host recovery and DocuSP recovery is
designed to ensure the integrity of each IPDS job when standard printer
problems (such as paper jams or supply shortages) occur.
If there is an unexpected or catastrophic error (such as a power failure,
operating system crash, or unrecoverable software problem) in either
DocuSP or IPS Gateway, IPDS job recovery depends on whether you are
using a spooled or streaming queue for printing IPS Gateway jobs.
Whether you are using spooling or streaming queues, jobs (or segments)
written in their entirety to the DocuSP queue are recoverable by DocuSP
after a DocuSP restart or system boot.
If an unexpected error occurs during the time that IPS Gateway is
processing a job and writing pages to the DocuSP queue socket, pages
written to a streaming queue will be recoverable by DocuSP. However,
when a spooling queue is in use, jobs or segments partially written to the
DocuSP queue are not recoverable.
In both cases, pages being processed by IPS Gateway but not yet written
to the DocuSP queue are recoverable from the host, which typically
resumes printing from the last checkpoint/restart page (see your PSF
documentation for more information).
Xerox recommends using a streaming queue without segmentation to
optimize IPDS job recovery.
IPS Gateway User's Guide (5/2002) 1-6