Entitled Capacity formula change

On January 24th, 2023, Skytap will update the Entitled Capacity (EC) formula for IBM Power LPARs to facilitate more efficient usage of Skytap resources. This change will reduce the maximum EC value per GB of memory for an LPAR by 20%.

The updated formula:

EC=MIN(vcpu_count,FLOOR(MAX(GiB_ram/50,0.05),0.005))

After the formula update:

• New LPARs will use the updated EC formula.
• Cloned and copied LPARs will use the updated EC formula.
• Existing LPARs will automatically use the updated formula after they’re shut down and restarted.

If the configured EC setting for an LPAR is higher than the newly calculated EC allocation, the EC configuration will be changed to the maximum EC allocation available using the new formula. If the configured EC setting for your LPAR is lower than the newly calculated EC allocation, no change will be made to your EC configuration.

Skytap allows LPARs that use the uncapped vCPU sharing mode to exceed their maximum processor allocation by consuming spare processor cycles from the Power VM shared processor pool. Capped LPARs are always limited to a maximum processor allocation equal to the configured EC.

For more information of how to configure EC on an LPAR, including a description of the EC allocation formula, see Editing VM vCPUs and RAM.