On 13/03/2013 12:00, Shane Ginnane wrote:
On Wed, 13 Mar 2013 10:01:57 +1100, Andrew Rowley wrote:
I'm not sure how it is packaged in z/OS, but in general I think it is
incorrect to replace the /etc directory when installing a new version of
the operating system - the same way you would not drop in a totally new
SYS1.PARMLIB.
lol - you wish ... read this:
http://publib.boulder.ibm.com/infocenter/zos/v1r13/topic/com.ibm.zos.r13.e0zm100/at3gend.htm?path=1_5_4_1_2#at3gend
That's not completely inconsistent with what I was saying...
They are telling you to merge your existing /etc and /var with the new
delivered ones, which is essentially correct. A new installation will
have stuff delivered in /etc and /var, but the contents will be
customised and will change and on a real system. The point is you don't
want to lose your current customisations - which could be for much more
than the base system software.
My approach would probably be to keep the delivered /etc somewhere e.g.
in the SERVICE filesystem, and have the real /etc mounted in it's own
filesystem so it is preserved when you replace the root with an upgrade.
Then you can compare old and new delivered /etc in the SERVICE
filesystems, and assess and migrate changes to the real /etc as
required. Typically, I would expect changes to the delivered /etc
between releases to be fairly minor.
I think the biggest problem with that document is that someone has tried
to write a procedure that will work in all circumstances, without any
constraints on what you are starting with e.g. having the old delivered
/etc to compare. If you can control your starting point, you can make it
much simpler.
Would a written procedure to merge a delivered and existing SYS1.PARMLIB
be any better? That's why they implemented concatenated PARMLIBs.
Regards
Andrew Rowley
--
and...@blackhillsoftware.com
+61 413 302 386
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