FYI:
The operating system on IBM Midrange boxes ("AS/400," "iSeries," "IBM
i," or whatever they're calling it this week) is "OS/400," "IBM i," or
whatever they're calling the operating system this week. These machines
are the descendants of the IBM S/3, which IBM Rochester developed in the
late 1960s as a successor to plugboard-programmable unit record machines.
Because of their heritage, IBM Midrange boxes traditionally use a
block-mode, EBCDIC-based terminal protocol called 5250 Data Stream. The
architecture is based on a compiled abstraction layer (the "Machine
Interface") built on top of the hardware; it was doing the "virtual
machine" thing long before the coffee-crazed folks at Sun came up with
the Java Virtual Machine.
At any rate, given that I manage multiple customer installations, I
probably have as much experience installing and running Tomcat on IBM
Midrange boxes as anybody, and I've noticed a number of things that work
differently on that platform than elsewhere. In particular, Tomcat
configuration changes that take effect immediately under Linux require a
Tomcat restart on IBM Midrange boxes. And I have, in turn, developed a
number of IBM-Midrange-centric tools for managing those installations,
most notably, a CL program (CL programs being the platform's *compiled*
command scripts) to launch Tomcat, and another one to shut it down
(forcibly if it fails to respond to a shutdown command in a reasonable
amount of time). And I've noted that when Tomcat is running on an IBM
Midrange box, there are two jobs associated with the server: the
CATALINA job, and a JVM job called "QP0ZSPWT" (I have no idea why, but
at least it's consistent)
And I tend to be very cautious about changes, adopting an "if it ain't
broke, don't fix it" attitude, so I'm not terribly inclined to even
investigate converting to from JSSE to OpenSSL.
Thanks for all the help. This List rivals the IBM Midrange Lists in
terms of having knowlegable people who are eager to help, and blows a
great many other developer/user communities completely out of the water
in that regard.
Curious about one thing: on our IBM Midrange installations, log entries
go into catalina.out. On our Cloud Linux installations, catalina.out is
almost always completely empty, and I have to go into the dated catalina
log files to see any entries. Does anybody have an explanation for this
difference?
--
JHHL
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