Testing our new print server on Redhat ES 2.1 and using LPRng-3.8.26,
I had a disturbing error during my testing.
As part of documenting the behavior of LPRng when a partial failure
occurs on the printer side, we sent a 1 Megabyte print job to a
Okidata line printer hooked up to an old DEC terminal server. 75% of
my printers use this configuration.
After about 2k of print had printed, we stopped the printer from
printing via taking it offline on the operator panel. The printer was
not turned off or disconnected. In this state with our existing
system, when we turned the printer back online 30 minutes later, it
should have resumed where it left off. The terminal servers asks the
host transmitting the data to wait until the serial line flow control
turns off again.
It did resume printing, but ceased as soon as it finished with the 16k
buffer contents. The remainder of the job did not come through.
The queue status on the LPRng server reported that the print had
complete successfully.
It seems to me that the raw socket printing failed to stop
transmitting while the terminal server could not accept additional
input, losing the rest of the job.
I'm going to start troubleshooting this in earnest in the morning, but
I'm looking for suggestions as to where to start. I'll likely put our
sniffer on it.
Here is my printcap for the printer:
.common
:sd=/var/spool/lpd/%P
:sh
:if=/usr/local/libexec/filters/lpf
H2FC | h2fc
:tc=.common
:lp=ts1-ELRIO.ksnet.com%2028
:cm="ELRIO COMPUTER ROOM"
I've considered perhaps we should use an alternate program to print to
slow devices requiring buffering (ie: netcat). I believe we used to
use a telnet filter, which may be from
http://h18003.www1.hp.com/support/digital_networks_archive/servers/tips/telnet.c
, however I did not previously have the source code.
Any suggestions are appreciated.
Russell
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