Capacity on Demand advancements on the IBM System z10
by C. Axnix J. R. Birtles M. Groetzner F. Hardt K.-J. Kuehl V. M. Lourenco C. Mayer J. Probst H. Sinram M. Stock and B. D. Valentine
Capacity on Demand (CoD), a key feature of the IBM System z®
platform, allows customers to adjust their processing and memory
capacity to their specific needs without having to shut down and
restart the machine and with no interruption to the complete
software stack running on it. The first System z CoD functions,
introduced with the IBM S/390 Parallel Enterprise Server™ 9672
G5 in 1998, were concurrent upgrade on demand for permanent
capacity and capacity back up for temporary capacity. Since then,
the functionality has been continuously enhanced, but CoD still had
a number of limitations that needed to be addressed to better meet
customer requirements. The IBM System z10™ platform
introduces a completely new architecture for CoD that provides
more flexibility, granularity, and responsiveness. In addition, the
System z10 platform provides an enhanced set of CoD application
programming interfaces for use by systems management or
automation software. This paper describes the new capabilities
from both a business and a customer perspective as well as from a
technical perspective.
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