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3 is the biggie IMHO...

iASP allows the IBM i to have multiple DBs....

Lets you have Dev/QA/Prod on a single box with the exact same set of
libraries.

Charles

On Wed, Dec 6, 2017 at 1:41 PM, Nathan Andelin <nandelin@xxxxxxxxx> wrote:

I've been reading about IASPs at:

https://www.ibm.com/support/knowledgecenter/ssw_ibm_i_73/
rzaly/rzalypdf.pdf?view=kc

Along with reading archived discussions.

IASPs are fundamental component of PowerHA and Geographic Mirroring. But
what about using them alone on a single system? Are there pros and cons?

The biggest con appears to be that they require a disk drive (2 for
mirrored protection), for each IASP. A case could be made to enhance IBM i
to support small internal virtual disks.

A number of use cases come to mind.

1. Reduce IPL time by separating application IASPs from SYSBAS.
2. Reduce SAVSYS time by separating application IASPs from SYSBAS.
3. Host multiple versions of applications by dividing them between IASPs.
4. Host an open-source project and external developers on an IASP (easy to
secure).
5. Use an IASP version of your application to create an installation
package.

Can you think of IASP pros and cons, compared to separate libraries and
directories, or compared to LPARs?
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