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

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 on the 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 not 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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