My name is Nick, and I defiantly use TSAF.
(This does not constitute an endorsement from my employer, yada yada
yada....)
I can do TSAF using only software. For ISLINKs, I can't link my
first-level system in without using hardware, at least on my z/VM 4.4
system. Maybe hardware CTCAs are much, much easier to implement than I
realize, but given what I have on hand, yeah, I use TSAF, wanna make an
issue of it? :-)
Sir Nick the Ardent
Wolfe, Gordon W wrote:
You could, but I wouldn't want to admit it in public.
----------
From: Schuh, Richard
Sent: Thursday, December 8, 2005 10:08 AM
Can't you accomplish the same thing by (ugh) creating TSAF virtual machines in
the 1st and 2nd level systems and connecting them via VCTCA?
-----Original Message-----
From: VM/ESA and z/VM Discussions [mailto:[EMAIL PROTECTED] Behalf Of Shimon
Lebowitz
Sent: Thursday, December 08, 2005 9:12 AM
I was going to write what Gordon said, but he beat me to it. :-)
One point to add -
I did not use to have real CTCs that connected an LPAR to *itself* (until I did my big multi-lpar CTC study about a year ago), but I *did* have 2 VM nodes in different LPARs.
By attaching one local end of the CTC to the virtual machine hosting the
second-level VM (in System-B), I basically created a linear network like this:
Node B ------- Node A---------Node X
(1st level) (1st level) (2nd level)
Node X accessed my 1st level SFS (in Node B) via Node A, with no problems
whatsoever. It felt a bit funny sending data on a two-way round trip to Node A,
just to get it into the 2nd-level VM, but it was still as fast as ever. :-)
Note that the ACTIVATE ISLINK commands were done in nodes X and A, nothing at
all was done in B. If you already have such a CTC, the whole setup is about a
minute! (One ATTACH to give a CTC address to the 2nd level host machine, and
two ACTIVATE commands).
Shimon
Quoting "Wolfe, Gordon W" <[EMAIL PROTECTED]>:
A great way to do this that takes a little setup is to do the following:
Set up a real channel-to-channel on your system with two addresses that talk to each other on the same LPAR. A virtual channel-to-channel will not work with a first-level system.
DEDICATE or ATTACH one end of the CTC to your second-level system.
Start up an ISFC connection between first and second level over the CTC. This requires only two CP commands, One command on each system.
Set up the first level shared file pool server as a remote filepool.
Then you can trade files back and forth using this filepool.
I've been doing this for years and it works great!
