Re: What about the PLIC?

[Glenn Ericson <Glenn-Ericson@xxxxxxx>]

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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