Patrick Spinler wrote:
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John Summerfield wrote:
I can understand that if you're running Ghostscript, then you're in for
some trouble.
No ghostscript, thank heavens. We just provide a dumb queuing
service, and send whatever the app produces straight to the printer.
No filtering.
I think you'd need to pay close attention to how (often) the CUPS
servers talk to each other, too. If they're discussing 10,000 printers
every few seconds. The default browseinterval is 30 seconds, that might
be a little often.
the problem appeared to be related to this, but not between the CUPS
servers. Specifically, since CUPS' default broadcast behavior doesn't
work across subnets, and since most of my hosts wanting to print to
CUPS weren't on those subnets, the client hosts had to be configured
to poll, and that broke the cups servers.
Our setup was like this:
Network Network Network Network Network many many
Printer Printer Printer Printer Printer others...
Cups Server Cups Server Cups Server
Subnet 1 Subnet 2 Subnet 3
Other Unix Other Unix Other Unix 400 other
Cups client Cups Client Cups Client unix hosts.....
Subnet 4 Subnet 5 Subnet 6 >20 subnets
Since broadcasts only propagate as far as a subnet boundary, the
'other hosts' would not see the broadcasts from the cups servers.
Ergo, they had to be configured to poll the servers, and that's what
appeared to break 'em, even on a several hour polling interval.
For those who haven't been around so long, I don't actually use zLinux
(except sometimes under Hercules, and that's about as close as I'm
likely to get to a Zed these days). I do administer Linux systems, and I
have some S/360, S/370 background.
My home LAN and the LAN I administer at home are linked via VPN, and we
too use several subnets.
At one time I wanted to print something from home to work, so I had CUPS
at home poll work's server, and suddenly all work's printers appeared at
home!
--
Cheers
John
-- spambait
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