Hi James
You've not been reading my posts!
Just kidding, but here goes my take on Independent ASPs.
They are a number of arms carved out like regular ASPs, but they have
their own QSYS, for one thing. When you activate an IASP within a job,
you have the regular QSYS (the *SYSBAS you see when you work with
various commands where you can specify a library).
One important use is HA - an IASP has been compared to a junior LPAR by
some. It can be set up on external disk and mounted independently. This
is nice for HA, where you can switch one IASP out and switch the
replicate in.
Another use is to have 2 IASPs on one machine or LPAR - one can be test,
the other production. The IASPs can, in fact, have exactly the same
library structure - they just can't have any libraries that are also in
*SYSBAS, since the name spaces are combined.
Modern IASPs also let you have the IFS under them - in fact, the IASP is
in the IFS, with a QSYS.LIB and a lot of the other IFS stuff in it.
The Redbook will talk about things that can't be in an IASP - that is
where you application comes in - things like communication objects are
typical. Maybe JOBQs - I don't recall right now.
But if you don't have those kinds of objects, normally there is no issue.
There can be installation/update issues - RST* commands default to
*SYSBAS but can restore things to an IASP, even when it is not mounted
(varied on).
When I was at RJS, we had a few customers run that software in an IASP -
worked great.
Larger customers (on the LUG, say) have agreed to expect software
vendors to be able to run in these things - because they are used so
much in HA scenarios.
Anyway, that's skipping a lot of preliminary information, perhaps, but I
hope it gives you some idea of what they are about.
Vern
On 6/12/2013 7:04 PM, James H. H. Lampert wrote:
A customer called to ask about any compatibility issues between our CRM
product and a Power HA system using IASP from IBM for disaster recovery.
This is the first I've heard of IASPs. I've found the Redbook about it,
but I'd also kind of like to know what the collective wisdom of the List
can tell me about them.
I remember one time, years ago, when some QuestView users got bitten by
ASPs, and I had to modify some things in the code, for compatibility; do
IASPs have any potential to bite?
--
JHHL
midrange.com
