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A novel technique for rapid recovery of shared resources

IP.com Disclosure Number: IPCOM000013909D
Original Publication Date: 2001-Jul-15
Included in the Prior Art Database: 2003-Jun-19
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Abstract

Consider a resource manager controlling updates to both local and shared resources. Shared resources are those which are available via a multiplicity of resource managers (peer resource managers) with the intent of making the resources more available since an outage of one resource manager does not lead to an outage of the resource as it can be accessed via another peer resource manager. In effect, a different class of service is offered for shared resources over local resources and one difference in this class of service is that shared resources should be more available.

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A novel technique for rapid recovery of shared resources

Consider a resource manager controlling updates to both local and
shared resources. Shared resources are those which are available
via a multiplicity of resource managers (peer resource managers)
with the intent of making the resources more available since an
outage of one resource manager does not lead to an outage of the
resource as it can be accessed via another peer resource manager.
In effect, a different class of service is offered for shared
resources over local resources and one difference in this class
of service is that shared resources should be more available.

     In the event of a failure of the resource manager it is
important to make the shared resources available to peer resource
managers as rapidly as possible. However, it was not previously
possible for peers to perform any operation on units of work
which are INDOUBT with respect to either the log of the failed
resource manager, or an external syncpoint manager. Typically
these indoubt resources would not be available until the restart
of the failed resource manager or recoordination with the
external syncpoint manager respectively. Every effort should be
made to make shared resources available as rapidly as possible,
and this disclosure describes techniques we have used to achieve
this.
1. The state of shared units of work and the resources affected
is both logged and checkpointed. This means that during the
first 'current status rebuild' phase of the failed reso...