Applications For Dr And Recommendations - Fujitsu Siemens Computers SX series User Manual

Functional scope, concepts and applications

10.1.2 Applications for DR and recommendations

Dynamic Reconfiguration can always be used during ongoing operation in the following
cases:
– Global resource management / dynamic workload distribution between partitions
– CoD (Capacity on Demand)
– Online maintenance of the hardware after faults
Global resource management / dynamic workload distribution between partitions
On systems as of the SX150 model series it is possible to switch resources backward and
forward between partitions within a system during ongoing operation, thus enabling the
resources of the partitions to be adjusted to changing workload situations. The CoD models
in a local partition which are described in the section below represent some of the global
server options mentioned.
Reconfiguration is performed by calling the DR-connect and DR-disconnect functions (see
page 286) in the partition concerned.
The principle
In a process designed for all servers one (or more) XSB(s) – the granularity of the resource
reconfiguration is the extended system board (XSB) – is removed from a partition, i.e.
withdrawn from access by the operating system of this partition, and integrated in another
partition. This measure is undone later or the XSB is made available to another partition.
You must ensure at all times that the license conditions are satisfied in every partition.
An example
Such a redistribution of the hardware resources makes sense or is even necessary if a
partition is, for example, planned for the execution of batch jobs for accounting at the end
of the month and more resources are to be made available for these batch jobs during this
period than normally. For the period of the accounting run this partition is then assigned an
additional XSB which is reassigned to the original partition at the end of the run.
Automation
This type of redistribution can also be automated within event- or time-driven procedures.
Event-driven redistribution based on the conditions defined by the user being met can be
implemented using openSM2 (see the manual "openSM2" [18]). The Tasks application of the
PRIMEPOWER ServerView Suite offers a mechanism for time-driven jobs.
288
Dynamic Reconfiguration
U41272-J-Z385-3-76