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What is the difference between purchased, allocated, consumed, and burst resources?

Question:

What is the difference between purchased, allocated, consumed, and burst resources?

Answer:

Purchased

In reserved compute pools, all resources must be purchased in advance. Virtual machines use only the resources purchased by the organization for that compute pool. When purchased resources are exhausted, virtual machine performance degrades.

In instance-based compute pools, processor and memory resources are not purchased by the organization; purchased processor and memory resources are not applicable to instance-based compute pools. Virtual machine placement and performance are monitored by IBM to maintain performance.

Allocated

When virtual machines are created, they are assigned specific processor and memory resources. The resources assigned to each virtual machine are reported as allocated resources. Allocated resources are defined identically for reserved and instance-based compute pools.

Consumed

When virtual machines are powered on, they consume physical processor and memory resources on the hosts on which they run. These physical resources are reported as consumed resources. Consumed resources are defined identically for reserved and instance-based compute pools.

Burst

In reserved compute pools, resource bursting allows a compute pool to expand demand beyond purchased resources using a separate, designated pool of host resources. To utilize bursting, the compute pool must be configured for bursting; contact your service delivery manager if you are unsure of the burst configuration for any compute pool. In a compute pool configured for bursting, users may enable bursting for processor or memory from Infinicenter Console as described in Resource Bursting.

In instance-based compute pools, bursting is not needed and is not available. Virtual machine placement and performance are monitored by IBM to maintain performance.