Re: What about the PLIC? -- MIDRANGE-L

OK
I'll be looking for your reply from Al in <location>

At 05:52 PM 06/04/2001 -0400, barsa@barsaconsulting.com wrote:

I'm traveling today, but will check with Rochester tomorrow.

Al

Al Barsa, Jr.
Barsa Consulting Group, LLC

400>390

914-251-1234
914-251-9406 fax

http://www.barsaconsulting.com
http://www.taatool.com



To:     MIDRANGE-L@midrange.com
Sent by:   Glenn Ericson    <Glenn-Ericson@att.net>                       cc:
Subject: Re: What about the PLIC?

Al
you know I deeply respect your knowledge of the 400 but this one had me
feeling very sure of my statements.   I spent a few minutes verifying
this with Development this afternoon.

PLIC, SLIC,   and the hypervisor are separate components. SLIC is saved   as
you say by SAVSYS. The PLIC is not saved and not part of SLIC. PLIC is
redundant in all partitions and if you lose one another can help
you on the rebuild with it's copy of the LPARed systems information. If
PLIC was saved it could remove some flexibility in the restore process
by imposing it's requirements.

Example is going to a hot site you do not care if you restore to a
primary secondary or multiple different systems as long as there is no
PLIC saved. Thus the system does not save PLIC

I hope that answers every ones question(s)

Glenn

Glenn Ericson,
Phoenix Consulting LLC , New York , NY USA
Ph.(718)898 9805 Fx .(718)446 1150
mailto:Glenn-Ericson@att.net

PS this is what the IBM web -site has to say:
from IBM web site
                                    Logical Partitioning

                 Backup and recovery
LPAR configuration data contains specific system data that has minimal use
beyond the system on which it was created. Since the data is redundant and
persistent, the ability to save and restore LPAR configuration data is not
provided. Rather, LPAR configuration data behaves like ASP configuration
data: the data cannot be saved, recovery is possible in most cases, and
some recovery scenarios require complete reconfiguration.

When performing an install on the primary partition, the LPAR configuration
data can be recovered (using a DST menu option) immediately following the
A-source IPL and prior to any ASP or disk configuration recovery. The
recovery routine checks all non configured disks for the missing
configuration, selecting the best candidate, and presenting this
information to the operator. Once confirmed by the operator, the system
updates the primary partition load source and automatically performs an
IPL.

Secondary partitions have the luxury of guaranteed redundant configuration
data on the primary partition load source. At the first IPL of the
secondary partition after it is installed, the partition configuration data
is automatically updated to match that of the primary. No LPAR-specific
configuration action is required by the user.

Generally, all save/restore functions operate on a logical system
(partition) just as they would on a physical system. No global,
"system-wide" backup is provided. Save tapes created on partitioned
systems can be used on the same system or a different system, with or
without partitions. Recovery occurs on a partition-by-partition basis just
as if the partition is its own system.

   Bill Armstrong, Troy Armstrong, Naresh Nayar, Ron Peterson, Tom Sand,
Jeff Scheel

At 09:48 PM 06/03/2001 -0400, barsa@barsaconsulting.com wrote:

     With all due respect to my friend Glenn PLIC is a layer of SLIC, and
     it is
     saved with a SAVSYS, which is a part of a save option 21.

     Al

     Al Barsa, Jr.
     Barsa Consulting Group, LLC

     400>390

     914-251-1234
     914-251-9406 fax

     http://www.barsaconsulting.com
     http://www.taatool.com

                         Glenn Ericson

                         <Glenn-Ericson@att.        To:
     MIDRANGE-L@midrange.com, MIDRANGE-L@midrange.com
                         net>                       cc:

                         Sent by:                   Subject:     Re: What
     about the PLIC?
                         owner-midrange-l@mi

                         drange.com

                         06/03/01 02:40 PM

                         Please respond to

                         MIDRANGE-L

     Sorry it does not get backed up

     At 05:23 PM 06/03/2001 +0000, Charly Jones wrote:

          Does anyone know how the PLIC is backed up? Option 21 will
          save everything, right? I know how to restore everything
          from an option 21 save. But how do you backup and restore the
     PLIC?

          Charly Jones
          Geezer in Gig Harbor

               From: Glenn Ericson <Glenn-Ericson@att.net>

               after doing several LPAR implementation at V4R$ you learn
     to
               say PLIC is
               Cool and more about hardware then you ever wanted to know.

                    For the benefit of anyone else who may not be
     intimately
                    familiar with the
                    technology behind LPAR, there is a great article here:

     http://www-1.ibm.com/servers/eserver/iseries/beyondtech/lpar.htm#abstract

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