Speed Boost applies only to the image being boosted; all other images not being boosted will run at subcapacity modelspeed. If you’re running on a subcapacity machine, there’s no reason not to run with speed boost. Any processing activity that uses CPs will benefit from Speed Boost.

Use the following links to learn more:

There are variations of zIIP boost, depending on how the CPC is configured, as well as the priced System Recovery Boost upgrade offering that will allow you to take additional advantage of zIIP boost.

The most basic type of zIIP boost is when you have defined Initial zIIPs, and no Reserved zIIPs that are backed by real processors. In this case, the zIIP blurring will happen for the duration of the boost on your defined, entitled zIIPs and at the end of the boost period. Normally, non-zIIP eligible work will stop running on zIIPs.

zIIP Boost with Reserved zIIPs

This is the case when you have some zIIPs that are defined as reserved, and some number of those can be backed by physical zIIPs. Those reserved zIIPs that can be backed by physical zIIPs will be brought online by the system at the beginning of the boost period, and then taken offline when the boost period is over.

System Recovery Boost upgrade

This is a priced feature for the z15 that requires you to have purchased an annual subscription for the Boost feature for your CPC that will allow you to bring up to 20 additional physical zIIPs online to the CPC for the duration of the capacity record activation, limited by the number of unused “dark core” processors you have in your CPC.

System Recovery Boost upgrade can be used with Startup boost and Shutdown boost.

Ordering System Recovery Boost upgrade requires three z15 hardware feature codes:

FC 9930 - SRB Upgrade Authorization | Drives necessary contracts required to enable the ordering of System Recovery Boost upgrade.

FC 6802 - SRB Upgrade Record | Enables temporary activation of additional physical zIIP processors to be used in conjunction with the base functionality.

FC 6799 - SRB Upgrade Years Ordered | Records how many subscription years you purchase for System Recovery Boost upgrade, with each feature code purchase equating to a one-year subscription.

IBM is offering a 90-day free trial for System Recovery Boost upgrade, so that you can test out System Recovery Boost upgrade in your own environment. The trial gives you 30 activations, each of which can be used to unlock up to 20 additional zIIP processors for up to 6 hours.

You can order the 90-day trial record using Resource Link. Resource Link will immediately stage the record for download upon ordering. Ordering requires online-buying enablement (#F/C 9900) and the associated contract supplements, as well as SRB Upgrade Authorization (#F/C 9930).

You are eligible for the trial if you are a new or existing z15 T01 customer, and if you have not already purchased the full System Recovery Boost upgrade offering.

Use the following links to learn more:

IBM recommends reading the following GDPS manuals, which describe how to implement these RTO improvements:

• GDPS Metro Planning and Implementation Guide (ZG24-6755), section 4.7.2, SYSPLEX script statement.
• GDPS Global - GM Installation and Customization Guide (ZG24-6757), section 4.5.7, SYSPLEX script statement.
• GDPS Global - XRC Installation and Customization Guide (ZG24-6759), section 4.6.9, SYSPLEX script statement.