Question 1

IBM says we owe full-capacity licensing because ILMT wasn't deployed — is that real?

Accepted Answer

Yes, and it is one of IBM's most common audit findings. IBM's sub-capacity licensing requires ILMT (IBM License Metric Tool) — or an approved alternative such as BigFix Inventory or Flexera with the IBM Sub-capacity pack — installed within 90 days of first eligible deployment, with quarterly reports retained for two years. Missing or late deployment of ILMT typically converts sub-capacity entitlements to full-capacity claims overnight, often producing seven-figure findings.

Question 2

What is the difference between PVU, RVU, and VPC?

Accepted Answer

PVU (Processor Value Unit) prices software per core, with a value-unit multiplier that varies by chip type. RVU (Resource Value Unit) prices by a measurable resource — users, devices, gigabytes, or MIPS, depending on the product. VPC (Virtual Processor Core) prices per virtual core in container and cloud environments, especially under IBM Cloud Paks. Each metric has its own counting rules and its own audit traps.

Question 3

How do IBM Cloud Paks change traditional licensing?

Accepted Answer

IBM Cloud Paks package multiple IBM products with a single VPC-based metric and Red Hat OpenShift entitlements. They are designed for container deployments and can simplify counting versus PVU per product — but the conversion ratios from legacy PVU licenses to Cloud Pak VPCs are where most cost surprises happen. Conversion proposals from IBM should always be modeled independently.

Question 4

Does IBM still audit aggressively?

Accepted Answer

Yes. IBM continues to run formal audits through its compliance team and authorized third parties. Common findings center on ILMT compliance, unlicensed sub-capacity claims, unauthorized use of restricted-use entitlements, and counting errors in virtualized or containerized environments. Audit response discipline matters — IBM's initial claims are typically negotiable with proper representation.

Question 5

What is the IBM 'restricted use' license trap?

Accepted Answer

Many IBM products ship with restricted-use entitlements bundled into other products — for example, a Db2 license embedded in another IBM product license. Using those restricted-use entitlements for unrelated workloads creates a separate full-license obligation. This is one of the most common — and easiest to miss — IBM audit findings.

Question 6

Can we negotiate IBM Passport Advantage pricing?

Accepted Answer

Yes. Despite the published Passport Advantage price book, real IBM enterprise pricing is heavily negotiated. Discounts depend on volume tier, term, payment terms, IBM's revenue position with your account, and timing against IBM's fiscal year. Customers who treat Passport Advantage list prices as fixed leave significant savings on the table.

Question 7

What is IBM sub-capacity licensing?

Accepted Answer

Sub-capacity licensing allows IBM PVU-based products to be licensed for only the virtual capacity actually used, instead of the full physical capacity of the underlying host. It requires deployment on eligible virtualization technologies and strict ILMT (or approved alternative) discovery and reporting.

Question 8

What does ILMT actually have to do?

Accepted Answer

ILMT must be installed and operational within 90 days of first eligible deployment, must discover all eligible IBM software, must generate the quarterly PVU consumption reports IBM requires, and must retain those reports for at least two years. Reports must be generated even in periods with no usage. Missing any of these requirements typically forfeits sub-capacity rights for the affected products.

Question 9

Can BigFix Inventory or Flexera replace ILMT?

Accepted Answer

Yes, for products and configurations where IBM has approved the alternative tool. BigFix Inventory (an IBM product) is fully equivalent for sub-capacity reporting. Flexera and certain other SAM tools are approved under the IBM Sub-capacity option, subject to validation. Confirm the specific product and version is on IBM's approved list before relying on a non-ILMT tool.

Question 10

How are IBM Cloud Paks licensed?

Accepted Answer

Cloud Paks are licensed by VPC (Virtual Processor Core), measured against the container resource limits or actual usage depending on the Cloud Pak. Most Cloud Paks include a Red Hat OpenShift entitlement and a bundle of IBM software with defined ratios for converting one product's usage into the others.

Question 11

Is converting from PVU to Cloud Paks always cheaper?

Accepted Answer

No. Cloud Pak conversion proposals can save money for the right workload mix and growth profile — and can be more expensive for stable, traditional deployments. The conversion ratios and bundle composition matter more than the headline 'modernization' messaging. Model both before signing.

Question 12

Do Cloud Paks require ILMT?

Accepted Answer

Cloud Pak VPC reporting uses different mechanisms than traditional PVU sub-capacity, typically through IBM License Service for OpenShift. The reporting obligation still exists — only the tool and the metric change. Treat container reporting with the same rigor as ILMT.

Question 13

How is IBM Db2 licensed?

Accepted Answer

Db2 is licensed in multiple editions and metrics: PVU (Enterprise Server Edition), Authorized User Single Install, VPC (under Cloud Paks), and others. Edition choice (Standard, Advanced, Enterprise) determines included features and price. Mixing editions across a single environment, or using restricted-use Db2 entitlements with non-bundled applications, is a frequent audit finding.

Question 14

How is IBM WebSphere licensed?

Accepted Answer

WebSphere Application Server is offered in multiple editions (Liberty, Base, Network Deployment) with PVU or VPC metrics, and ND has cluster-specific counting rules. WebSphere is often included in Cloud Pak for Applications, with conversion rules that materially change the cost picture.

Question 15

How is IBM MQ licensed?

Accepted Answer

MQ is typically licensed by PVU per server or VPC under Cloud Pak for Integration. Client-side licensing and Advanced edition features each carry their own rules. MQ is frequently under-licensed in environments where messaging traffic patterns change without corresponding entitlement review.

Question 16

What triggers an IBM audit?

Accepted Answer

Common triggers include long periods without a renewal or expansion, suspected ILMT gaps, M&A activity, container/cloud migrations, and routine cycle audits. IBM contracts include verification clauses that allow audits on reasonable notice.

Question 17

What should I do first when IBM sends an audit notice?

Accepted Answer

Acknowledge receipt in writing without agreeing to scope, methodology, or timeline. Do not run IBM-provided scripts or share inventory before validating contractual obligations. Engage independent audit defense counsel before substantive engagement with the auditor.

Question 18

Are IBM audit findings negotiable?

Accepted Answer

Yes — almost always. Initial IBM compliance findings frequently include disputed counting positions, restricted-use interpretations, and full-capacity claims that can be contested when ILMT and contract terms are properly applied. Settlements typically land well below initial demands when the response is disciplined.

Question 19

Should we maintain IBM Subscription & Support?

Accepted Answer

S&S provides version upgrades, patches, and IBM support — and is generally required for active workloads on supported versions. Dropping S&S to save cost is rational only for stable, end-of-life environments not heading to future IBM upgrades or cloud migrations. Reinstatement after lapse is expensive and not always available.

Question 20

Can we move IBM workloads between environments without re-licensing?

Accepted Answer

License mobility under IBM is product- and contract-specific. Some entitlements move freely; others are tied to specific deployments, server classes, or geographies. Cloud and container moves frequently trigger conversion conversations IBM uses as upsell moments.

Question 21

When is IBM's fiscal year end?

Accepted Answer

IBM's fiscal year ends December 31, with quarter ends March 31, June 30, and September 30. Sales pressure increases at quarter and year end, particularly Q4. Discounts on renewals and new commitments correlate with that timing.

Question 22

How is IBM mainframe software licensed?

Accepted Answer

Mainframe (IBM Z) software is licensed by MSU (Million Service Units) or MIPS depending on the product and pricing metric, with several pricing options including Tailored Fit Pricing. The optimization levers (workload tuning, soft-capping, sub-capacity reporting via SCRT) materially change monthly bills.

Question 23

How is IBM Power software licensed?

Accepted Answer

IBM Power software typically uses PVU with the Power-specific value-unit multipliers (commonly higher than x86). Sub-capacity is supported under LPAR and PowerVM with proper ILMT or BigFix reporting. Counting cores correctly in capped vs uncapped LPARs is the most common source of error.

IBM licensing questions, answered straight.

Jump to a topic

Questions people actually ask about IBM licensing

Sub-capacity, ILMT, and BigFix Inventory

IBM Cloud Paks and container licensing

IBM Db2, WebSphere, MQ, and product-specific traps

IBM audits and compliance reviews

Passport Advantage, S&S, and contract levers

Mainframe (MIPS, MSU), Power, and platform licensing

Go deeper on IBM licensing

Have an IBM licensing question this FAQ doesn't answer?