vSphere 8 Licensing Error - "The license capacity is insufficient"

Products

• VMware vSphere ESX 7.x
• VMware vSphere ESX 8.x
• VMware vCenter Server 8.0
• VMware vCenter Server

Issue/Introduction

When attempting to assign a license key (e.g., vSphere 8 Standard or Enterprise Plus) to an ESXi host in vCenter Server 8.x, the operation fails with the following error: "The license capacity is insufficient"

The "Usage" column shows a higher number than the actual physical core count or the "Capacity" of the license key being assigned.

Environment

• Product: VMware vSphere / vCenter Server
• Version: 8.x, 7.x
• Category: Licensing / Entitlement

Cause

vSphere 8 introduced a per-core licensing model with a mandatory minimum of 16 cores per physical CPU (socket).

1. 16-Core Floor: Even if a physical CPU has fewer than 16 cores (e.g., an 8-core or 12-core processor), vCenter will consume 16 cores of license capacity for that CPU.
2. High Core Count: If a CPU has more than 16 cores (e.g., 32 cores), it requires 32 cores of license capacity.
3. Calculation: Total Capacity Needed = (Number of CPUs) x (Max(16, Physical Cores per CPU)).

Resolution

Step 1: Verify Hardware Configuration

Check the physical hardware of the host(s) you are trying to license:

• Identify the number of occupied CPU sockets.
• Identify the physical core count per CPU.

Step 2: Calculate Required Capacity

Compare your hardware against the 16-core minimum rule.

• Example A: 2 CPUs with 8 cores each = 32 cores required (16 x 2).
• Example B: 2 CPUs with 24 cores each = 48 cores required (24 x 2).

Step 3: Consolidate License Keys (Broadcom Support Portal)

If you have multiple license keys for the same product, you may need to combine them to meet the total core requirement for a single host.

1. Log in to the Broadcom Support Portal.
2. Navigate to My Entitlements >Site >Product>License.
3. Select the product and use the Merge function to combine smaller keys into one large capacity key.
4. Re-try the assignment in vCenter using the new combined key.

Step 4: Purchase Additional Capacity

If the physical core count exceeds your total entitlement, contact your Broadcom Sales Representative or Reseller to purchase additional core add-ons.