Browse Prior Art Database

Oscillation Recovery System with Concurrent Stand-Alone Dump

IP.com Disclosure Number: IPCOM000104090D
Original Publication Date: 1993-Mar-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 2 page(s) / 63K

Publishing Venue

IBM

Related People

Greenstein, PG: AUTHOR [+2]

Abstract

A method for taking a stand-alone dump in a failing logical partition with gradual transfer of resources from the failing partition to the backup partition.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 57% of the total text.

Oscillation Recovery System with Concurrent Stand-Alone Dump

      A method for taking a stand-alone dump in a failing logical
partition with gradual transfer of resources from the failing
partition to the backup partition.

      The configuration consists of two logical partitions (LPARs),
one (LPAR A) with a large number of resources running the production
system, and another (LPAR B) with a marginally small number of
resources running a hot-standby system backing up the production
system, see Fig. 1.

      If a failure of the production system in LPAR A occurs, the
backup system in LPAR B detects it.  At that time, system B starts
the takeover process.  At the same time, if it is necessary to
collect problem-determination (PD) data pertinent to the system
failure in LPAR A, Stand-Alone Dump (SADUMP) can be activated in LPAR
A (either by the failing system A, or system B, or some external
agent).  On initialization, SADUMP in LPAR A frees (deconfigures) any
hardware resources (some channel paths (CHPs, all CPUs but one) it
does not need for successful dumping of real, virtual, and expanded
storage.  As the LPAR A resources are being freed, LPAR notifies the
system in LPAR B about their availability and the system in LPAR B
starts acquiring those resources, thus gradually increasing its
power.  As SADUMP dumps central and expanded storage, it gradually
transfers the dumped ranges to LPAR B.  On completion of stand-alone
dump in LPAR A, the remainder of...