Re: Powering off hosting partition

[Roberto José Etcheverry Romero <yggdrasil.raiker@xxxxxxxxx>]

Rob,

If i understand correctly, you tried to have a program run in a hosted
partition while the DISKs for said partitions were unavailable due to the
hosting partition being offline? In any other OS (AIX included) that would
have resulted in a crash, kernel panic or guru meditation (whatever the
cool kids are calling it nowadays). AFAIK only IBM i's  LIC has the ability
to simply halt all processing until the disks re-appear. But it's just
that, all processing HALTS (It's one of the very good reasons for a Dual
VIOS setup).

Back on topic, were you trying to see how much time elapsed between the UPS
notifying the hosting partition and the system going down? or was it more
of a "i want the hosting partition to notify all others to come down before
i do"?


On Wed, Nov 5, 2014 at 4:16 PM, <rob@xxxxxxxxx> wrote:

> Hey Larry,
> I tried that powering off the hosting partition and see what happens to
> the guests.
> Yes, the HMC shows a SRC that indicates hung disk on the guests.
> Starting the host and the guests carry right on.
> Instead of power cycling the host a simple vary off of the nwsd should
> work.
>
> All happened because of some bad system values while doing a UPS test.
> Luckily it was the 'backup' box.
>
> What it did show me was the trying a 10 second loop counter while waiting
> for power back up was not the greatest idea.  Basically I was seeing if it
> was just a temporary power outage that our UPS could easily handle.  The
> loop didn't increment during the disk hang.  Changed the logic to do a
> RTVSYSVAL QDATETIME at time of CPF1816 and periodically while waiting for
> CPF1817 or a time interval.  And calculating the difference between the
> two to see if the power didn't come back up in a timely fashion.
>
>
> Rob Berendt
> --
> IBM Certified System Administrator - IBM i 6.1
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