Re: YAIQ - Yet another ignorant question: multiple LPARs.

John,

All objects reside in "libraries" on the i (think of PC-DOS directories
that cannot be nested). These are associated with individual hosts (either
physical systems or virtual partitions (LPAR)). I'm not familiar with a
sysplex, so I can't make any comparisons.

A common method of sharing data files between systems is by creating a DDM
file (Distributed Data Management). This virtual DDM file will point to a
physical file in another library, or on another system (physical or
virtual). The DDM file will provide access to the actual data on the
target system. The DDM connection is typically over a network (typically
TCP/IP). The IBM i provides a virtual TCP/IP network between LPARs on the
same physical system, with a speed of 100 GB. DDM files can be read,
updated and deleted from both the local and the remote systems. Multiple
remote systems can point to the same target system.

How would you control updates from your test or QA environments to data in
a sysplex?

There are also ways to share disk pools between physical and virtual
systems. Check into Shared ASP (Auxiliary Storage Pools).


Steven Morrison
Fidelity Express
903-885-1283 ext. 292




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YAIQ - Yet another ignorant question: multiple LPARs.






If/when we go from z/OS to an i, we plan to have three LPARs (probably
all on the same machine). The three will be: Production; Development &
QA; "sandbox" for software testing (OS and vendor, not application). On
z/OS we run these in a sysplex. That lets us safely share data directly.
I cannot see anything like this for the i. I get the impression that
data sharing on the i is done more like it is on UNIX or Windows. That
is, one system "owns" the data and if a job on another system needs
access to it, the I/O is done by the "owing" system and then sent
(TCPIP??) to the "requesting" system. I am aware that this is the method
that databases often use.

So, on an i, are the LPARs each separate with their own files, spool,
tapes, etc. What can be shared and how? A pointer to a manual would be
very appreciated.

Many thanks.

John McKown

Systems Engineer IV

IT



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