On Mon, 15 Jun 2009 10:28:58 +0200, Vernooij, CP - SPLXM
<[email protected]> wrote:
>
>We already discovered that the MIM command character was used for
>several purposes in MIM, a.o. for creating the name of the MIM SSI
>subsystem en for custructing the ISG exit names (for what purpose, can I
>have 2 MIM's in 1 system?).
Yes. For different components. For example, MII, MIA and MIC. Some
shops run them all in different address spaces.
We separated out MIA from MII/MIC years ago for 2 reasons:
1) System integrity / stability: Tape problems (virtual) sometimes
required a recycle of MIA. Usually not the fault of MIA, but that's not
to say there haven't been MIA bugs over the years. Also if there
was a MIA abend, it would only affect tape and not the other components
sharing the address space.
2) MII/MIC run at SYSTEM priority x'FF' / 255. MIA only needs to run at
SYSSTC (x'FE' / 254).
Mark
--
Mark Zelden
Sr. Software and Systems Architect - z/OS Team Lead
Zurich North America / Farmers Insurance Group - ZFUS G-ITO
mailto:[email protected]
z/OS Systems Programming expert at http://expertanswercenter.techtarget.com/
Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.html
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