HP JetDirect queues fail after 3.2.5 to 4.1.5 migration
After upgrading from AIX 3.2.5 to AIX 4.1.5 our JetDirect
print queues that existed before the migration don't function
but newly added JetDirect queues do. When I submit a print
job to a JetDirect print queue defined before the migration,
I get the error:
error opening /var/spool/lpd/pio/dev/hp..... as stdout for
If you look in /etc/qconfig you will see that each queue
device (for local and JetDirect queues) have a line that
file = \
In the case of a local (serial or parallel) printer, the
purpose of this is much more obvious... When a job is sent
to this queue, qdaemon invokes the backend program and sends
its stdout to the file specified by the "file =" line.
This makes good sense for piobe - it writes the formatted
print job to stdout which is directed to the appropriate
file, eg. /dev/lp0.
However, in the case of an HP JetDirect, the behavior is a bit
more subtle. Since the output isn't going to a "file" but
rather being piped into piohpnpf to be sent across the network,
why bother to have a "file =" at all? The answer is for
locking purposes - if you have two print queues pointing to
the same JetDirect printer, only one of the two queues can
be sending data to it at a time. The file specified in the
"file =" line isn't where output is sent, but since only one
process can open the file for writing at a given moment, it
ensures only one queue will be RUNNING a job while the other
is in DEV_BUSY state waiting to be able to open the "file ="
However, at AIX 3.2.5 these "lock" files resided in
/var/spool/lpd/pio/dev - which no longer exists in AIX 4.1.
Therefore, no queue can open the files in this directory.
In AIX 4.1.5 the files now reside in
The solution is to modify the path of the "file =" line in
/etc/qconfig to the correct location and create a blank file
in the directory corresponding to the "file =" line in
qconfig. An alternate solution would be to just take out the
"file =" line, or set "file = FALSE" which has special
meaning (discard stdout).
Support Line: HP JetDirect queues fail after 3.2.5 to 4.1.5 migration ITEM: DF3404L
Dated: July 1997 Category: N/A
This HTML file was generated 99/06/24~13:30:16
Comments or suggestions?