IBM System z Software Pricing

Sub-Capacity Corner

Sub-Capacity for z/OS

When you are running z/OS in 64-bit mode and are no longer running OS/390 on your System z server, you have the option to pay the charges for your eligible software on a sub-capacity basis. The Sub-Capacity Reporting Tool (SCRT) is the program which processes SMF 70 and SMF 89 records created by z/OS to produce a report showing LPAR utilization figures which are used to set the software charges.

Sub-capacity pricing is based on the four-hour rolling average utilization of the z/OS LPARs observed within a one month reporting period. The reporting periods run from 00:00 on the second calendar day of the month through midnight (23:59) on the first calendar day of the following month.

When a z/OS machine has Sub-Capacity charges, and a version to version z/OS migration is taking place, and if IBM has determined that the migration is eligible for Single Version Charging, then charges for the previous version are waived and the new version is charged at the combined concurrent peak MSUs for all versions of z/OS reported on the customer's Sub-Capacity Report for that month.

Enhancements to Sub-Capacity for z/OS

Contact IBM

Browse System z


IBM provides world-class IBM mainframe technology to help today's enterprises respond quickly to evolving business conditions and with extreme flexibility. From automation to advanced virtualization technologies and open industry standards, IBM mainframes help deliver competitive advantages for enterprises contributing and succeeding on a smarter planet.

Operating Systems

IBM System z supports multiple operation systems:


IBM's technology, solutions and industry expertise can help you find the competitive edge with a sharper understanding of your customers. Our System z solutions combine the foundation of IBM hardware, software and middleware with flexible financing and packaging options to help your business meet and overcome the challenges of doing business in the on demand world. IBM can help you develop a customer-centric view—and assist you in delivering the right solution and the right products.