Chapter 4. Reliability, availability, and serviceability
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When determining a highly available architecture that fits your needs, consider the following
topics:
Will I need to move my workload from an entire server during service or planned outages?
If I use a clustering solution to move the workload, how will the failover time affect my
service?
If I use a server evacuation solution to move the workload, how long will it take to migrate
all the partitions with my current server configuration?
4.4.1 Clustering
IBM Power Systems running under PowerVM, AIX, and Linux support a number of different
clustering solutions. These solutions are designed to meet requirements not only for
application availability in regard to server outages, but also data center disaster management,
reliable data backups, and so on. These offerings include distributed applications with
IBM DB2® PureScale, HA solutions that use clustering technology with IBM PowerHA
SystemMirror®, and disaster management across geographies with PowerHA SystemMirror
Enterprise Edition.
For more information, see the following references:
Guide to IBM PowerHA SystemMirror for AIX Version 7.1.3, SG24-8167
http://www.redbooks.ibm.com/abstracts/sg248167.html
IBM PowerHA SystemMirror for AIX Cookbook, SG24-7739
http://www.redbooks.ibm.com/abstracts/sg247739.html
4.4.2 Virtual I/O redundancy configurations
Within each server, the partitions can be supported by a single VIOS. However, if a single
VIOS is used and that VIOS terminates for any reason (hardware or software caused), all the
partitions that use that VIOS will terminate.
Dual VIOS partitions can only be created through an optional HMC. A Power E850C server
that is managed through the Integrated Virtualization Manager (IVM) is limited to a single
VIOS partition.
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