ILMT remediation, before it costs you full capacity.

Sub-capacity licensing lets you license only the virtual cores running IBM software instead of the whole physical host. The right to do that is conditional. IBM requires ILMT, or an approved tool, deployed within 90 days of first eligible deployment, running continuously, with quarterly reports retained for two years. Miss any one of those conditions and IBM defaults the period to full-capacity charging.

The gap is rarely a missing license. It is a tool problem. ILMT miscategorizes installs and needs manual correction. A broken or missing agent voids the sub-capacity claim for the period it was down. The lookback can run two to five years of back payments at full-capacity rates. The difference is not small: WebSphere using four of thirty two host cores is 480 PVU under sub-capacity and 3,840 PVU at full capacity for the same install.

By the time IBM raises it, the question is no longer whether you were entitled to sub-capacity. It is whether your evidence proves it. That is what remediation rebuilds.

A corrected ILMT configuration, a reclassified install inventory, a reconstructed set of quarterly reports, and a written sub-capacity position you can hand to an auditor. Where a gap cannot be closed, you get a clear account of its scope and the exposure it carries, so nothing in the settlement is a surprise.