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Logical partitions that use shared processors can have a sharing mode of capped or uncapped.
A capped logical partition is a logical partition that cannot use more processor power than its assigned processing units. The capped partition is assigned a maximum capacity and guarantees a capacity that cannot be exceeded and cannot affect the overall behavior of the physical system.
An uncapped logical partition is a logical partition that can use more processor power than its assigned processing capacity. The limiting factors are the number of virtual processors that are assigned to the logical partition or the maximum processing unit of the shared processor pool. The uncapped partition is guaranteed a minimum resource level, with the potential to use more and creates a minimum service level for the partition.
If multiple uncapped LPARs need additional processor capacity at the same time, the server can distribute the unused processing capacity to all uncapped LPARs. The uncapped weights of every LPARs determine this distribution process. The default uncapped weight value is 128 with 255 being the highest weight. When you set the uncapped weight to 0, no unused capacity is distributed to the logical partition.
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