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| APAR (Authorized Program Analysis Report) |
Abstract
POWERHA CLUSTER MONITOR BASED ON HMC REST APIS
Error Description
The IBM i cluster technology makes use of user registered
cluster node monitors to determine whether a system has truly
failed when communication is lost to the system. When a user
registers a cluster node monitor on a node the node will
register a Common Information Model (CIM) indication handler
program in Cluster Resource Services with the CIM server
supported by a specified Hardware Management Console (HMC).
Should a node managed by the monitored HMC suffer a failure or
crash the HMC will send a message (via the CIM server) to all
registered CIM indication handlers containing data on the nature
of the failure and the node affected by the problem. Cluster
Resource Services will take appropriate action based on the
nature of the reported failure.
The HMC is being updated to replace the existing CIM server with
a new representational state transfer (REST) based interface.
HMC version 850 (V8R8.5.0) will be the last version of HMC to
support the CIM server, and will also be the first version of
HMC to support all REST API functionality required by the IBM i
cluster monitor.
This fix enables cluster node monitors to use the HMC REST
interface.
Problem Summary
The IBM i cluster technology makes use of user registered
cluster node monitors to determine whether a system has truly
failed when communication is lost to the system. When a user
registers a cluster node monitor on a node the node will
register a Common Information Model (CIM) indication handler
program in Cluster Resource Services with the CIM server
supported by a specified Hardware Management Console (HMC).
Should a node managed by the monitored HMC suffer a failure or
crash the HMC will send a message (via the CIM server) to all
registered CIM indication handlers containing data on the nature
of the failure and the node affected by the problem. Cluster
Resource Services will take appropriate action based on the
nature of the reported failure.
The HMC is being updated to replace the existing CIM server with
a new representational state transfer (REST) based interface.
HMC version V8R8.5.0 will be the last version of HMC to support
the CIM server, and will also be the first version of HMC to
support all REST API functionality required by the IBM i cluster
monitor.
Existing cluster node monitors using the CIM server will not be
able to communicate with the HMC if the HMC version is V8R8.6.0
or later. For later versions of the HMC the CIM cluster node
monitors must be replaced with REST cluster node monitors.
Problem Conclusion
Cluster node monitors can be either CIM monitors or REST
monitors. In the past only CIM cluster node monitors were
supported.
Temporary Fix
Comments
Circumvention
PTFs Available
R710 SI62534 
7192
R720 SI61908 
7068
Affected Modules
Affected Publications
Summary Information
| Status............................................ | CLOSED PER |
| HIPER........................................... | No |
| Component.................................. | 5770HAS00 |
| Failing Module.......................... | RCHMGR |
| Reported Release................... | R720 |
| Duplicate Of.............................. |
System i Support
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Document Information
Modified date:
28 July 2017