Browse Prior Art Database

Minimizing System Storage Damage

IP.com Disclosure Number: IPCOM000115813D
Original Publication Date: 1995-Jun-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Sutton, AJ: AUTHOR

Abstract

The design describes the capability to minimize damage done when an error occurs in Expanded Storage in a Logical Partitioned (LPAR) environment running multiple partitions.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 97% of the total text.

Minimizing System Storage Damage

      The design describes the capability to minimize damage done
when an error occurs in Expanded Storage in a Logical Partitioned
(LPAR) environment running multiple partitions.

     Expanded storage contains master data and the loss of master
data is a data integrity problem.  Certain of these error types cause
megabytes of data to be lost.  The design minimizes the damage to
only those partitions affected versus all partitions.

     The early recognition of the error type by error handler allows
the activation of system recovery functions at the time of error,
rather than waiting for eventual degradation of the program(s) that
are using those resources that are in error.  In this design the
address ranges of the resources affected are reported to the error
handler which sets a flag for CP Licensed Internal Code (LIC) to know
the event has occurred.  CP LIC, when in LPAR modes, does a SIE
intercept when the failing address range is accessed.  LPAR verifies
the address is bad.  LPAR then will System Reset the Partition and
output a priority message on the system console, with an alarm set.
The System Reset will reset the I/O Interface for all channels the
Partition was using, to allow takeover by any Backup Partition or
system.  Multiple Partitions could be affected and are handled
separately as noted above.

     This design can be extended to other shared resources that have
the capability to be recognized, with own...