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In my environment it makes sense as I have one partition running i5/OS
and it is set to auto start when the machine starts. If the HMC is
down, I can use the twinax console for DST or restricted state saves.
In my environment I do not need the HMC but love the remote access. (We
needed it at one time cause we did not have the load source in the CEC
but in a 5095 tower.)

I totally agree you need to keep you HMC and FSP insync to prevent such
a hair pulling event as you described below.

Hopefully someday the HMC will be integrated into the FSP instead of a
separate box. Such as our Dell and Compaq servers with their DRAC and
ILO cards. (Yes the iSeries is much more complex but it is just
software and my cell phone can probably run the HMC software...;-)

Chris Bipes
Director of Information Services
CrossCheck, Inc.



-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of rob@xxxxxxxxx
Sent: Thursday, April 29, 2010 8:29 AM
To: Midrange Systems Technical Discussion
Subject: RE: HMC - FSP Upgrade

What possible good is an alternate system console in this case? This is

my concern. You have a box with three lpars. Two running i and one
running Linux. Box goes down. You plug it back in. Push the white
button on front. Box comes up. No lpar is set to start automatically
when the box fires up. In this scenario what possible good would a
piece
of twinax, or a lan console do you? Another scenario. You rarely use a

tape drive on the one lpar. It's an HA backup. Now it's time for your
annual save to tape. You jump on your HMC and try to transfer a card
from
the primary lpar to the HA lpar to do a backup. Nope, can't do it. HMC

no longer matches the firmware level and won't perform the move.
Scenario
three. Lan card in your Linux partition has gone dead. Miraculously
enough a vital application is still running on it doing some minor task
like running a heart/lung machine via a comm port. You want to replace
that lan card but now you can't because the HMC won't talk to the FSP.
And
there's a wife in the other room who rathers you didn't power down the
machine to replace the lan card. (Think blue screen of death -
literally.)


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