IBM sub capacity licensing requires ILMT compliance. Without compliance, sub capacity reverts to full host counting. The 90 day cure period exists for documented gaps; few customers know it exists or use it.
IBM License Metric Tool deployment is required for sub capacity licensing of PVU products on virtualized infrastructure. Without ILMT, IBM contractually requires full host counting; sub capacity rights are forfeited.
Sub Capacity Reporting Tool generates quarterly compliance reports. Two year retention is contractually required. Customers who skip retention cannot defend prior periods during audit.
VMware sub capacity requires capped clusters with documented affinity rules. Uncapped clusters default to full host counting. The framework documents the configuration patterns that maintain defensibility.
PowerVM sub capacity requires explicit LPAR profiles with documented entitled processor units. Shared processor pool configurations require specific documentation to support sub capacity.
Nutanix AHV, KVM, Hyper V each have distinct sub capacity requirements. The framework includes platform specific configuration checklists.
IBM permits 90 day cure for documented ILMT failures. Customers who experience temporary ILMT outages can preserve sub capacity rights through documented remediation. The provision is rarely volunteered by IBM.
Air gapped environments cannot run ILMT. Manual measurement following published methodology can substitute for ILMT in defined scenarios. The framework documents the qualifying conditions.
Compliance drifts. Quarterly review captures and holds readiness. Without it, the next audit finds gaps.
This white paper draws on Redress Compliance engagements, public vendor documentation, and the active Redress benchmark program.
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