On Tuesday, 04/04/2006, Chuckie wrote:
> Also, in z/VM 5.1 (or was it 5.2? I forget...) we initialize the backup
> OSAs when you activate the VSWITCH and will detect the "unplug" event on
> the backups and issue messages.  In earlier releases we didn't
initialize
> or watch the backup OSAs unless the primary failed.

After a all-too-brief absence, Chuckie has returned from wherever it is he
hides.  <THUMP> OW!  He *obviously* has been posting again as the above
ruminations contain assertions which have a negative correlation with the
nominal operating parameters of said functi--- CUT IT OUT, CHUCKIE!! GIMME
THAT KEYBOARD!  NOW.

Ahem... or to put it another way, it's wrong.   :-)

The backup OSAs are not monitored.  As an alternative, I would suggest
using a "private" VSWITCH that has a *primary* OSA on the same chpid as
the *backup* OSA on your "public" VSWITCH.  That will cause the VSWITCH to
monitor the "backup" and issue messages if the cable is pulled or the port
is disabled.  This technique requires one "private" VSWITCH per backup
OSA.

Or you could, as David K. suggested, use a TCP/IP stack (with no running
apps) connected to those alternate subchannels.  Then you could monitor
all backup OSAs from a single guest.  Use IP addresses that are
specifically NOT in the subnet range for the LAN.

We will be examinig this issue to see if there's something we can do in a
future release to address the issue.

[Will someone PLEASE call a Dr?  There is an imprint of TAB Q W E R on the
back of my head...]

Alan Altmark
z/VM Development
IBM Endicott

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