Determining the Number of Required ESU Licenses
確定所需 ESU 授權數目
ESU licenses correspond to the number of underlying core licenses of your server or operating system. You can license Windows Server and SQL Server based on either physical cores (pCores) or virtual cores (vCores). With ESUs sold through Commercial Licensing, the licenses must align with how you've licensed the underlying Windows Server or SQL Server.
Physical Core Basis: If you choose this option for your underlying software, you'll need an ESU license for each physical core on the server. All validly licensed guest VMs running on the host are covered without the need for additional licenses. (Note that Windows Server and SQL Server software editions have different allowed virtualization entitlements for the number of guests allowed.) Windows Server has an 8-core minimum per processor and 16-core minimum per server for pCore licensing. SQL Server has a 4-core per processor minimum.
Virtual Core Basis: If you opt for this option for your underlying software, you'll require an ESU license for each virtual core assigned to the VM. Windows Server has an 8-core minimum per VM for vCore licensing. SQL Server has a 4-core per VM minimum.
In summary, when licensing with Commercial Licensing ESUs (SKUs), the number of ESU core licenses must align with how you've licensed the underlying Windows Server or SQL Server. Also, with the Commercial Licensing ESUs, you must ensure that the ESU edition matches the edition of your underlying software. For instance, if you have Windows Server Datacenter on your VM, you should acquire ESU Datacenter edition if you want to license at the vCore level.
Note
The majority of WS 2012 licenses were sold on a per Processor or per Core basis (not on a per VM basis). For purposes of ESU core calculation, assume each 2 Processor license (the minimum per server) is equivalent to 16 pCores.
Examples:
Physical Core Scenario: A customer with a 16-core server licensed with Windows Server Datacenter on a pCore basis will need to acquire 16 ESU Datacenter licenses. This covers the entire server regardless of the number of guest VMs running on it.
Virtual Core Scenario: A customer with three 8-core VMs licensed with Windows Server Standard on a vCore basis will need 24 ESU licenses of the Standard edition to cover all VMs. When adding an additional VM, additional ESU licenses must be acquired accordingly. For VMs larger than eight vCores, i.e exceeding the minimum, add up all the vCores to get the correct price.Knowing your underlying license status for a given server enables you to accurately determine the number of Extended Security Update licenses you'll need.
ESU 授權對應伺服器或作業系統的基礎核心授權數目。 您可根據實體核心 (pCores) 或虛擬核心 (vCores) 來授權 Windows Server 與 SQL Server。 針對透過商業授權銷售的 ESU，授權必須與您授權基礎 Windows Server 或 SQL Server 的方式一致。
實體核心基礎：如您為基礎軟體選擇此選項，則伺服器的每個實體核心均需 ESU 授權。 所有在主機上執行的有效授權訪客 VM 均涵蓋在內，而無需額外授權。 (請注意，Windows Server 和 SQL Server 軟體版本對於允許的來賓數目有不同的允許虛擬化權利。) Windows Server 針對 pCore 授權，每個處理器最小值為 8 核心，每個伺服器最低 16 核心。 SQL Server 每個處理器的最小值為 4 核心。
虛擬核心基礎：如果您針對基礎軟體選擇此選項，則每個指派給 VM 的虛擬核心均需 ESU 授權。 針對虛擬核心授權，每個 VM 的 Windows Server 最小值為 8 核心。 SQL Server 每個 VM 的最小值為 4 核心。
總而言之，當利用商業授權的 ESU (SKU) 進行授權時，ESU 核心授權數目必須與您授權基礎 Windows Server 或 SQL Server 的方式一致。 此外，當使用商業授權的 ESU 時，您必須確定 ESU 版本符合基礎軟體的版本。 例如，如您的 VM 擁有 Windows Server Datacenter，則當您要在虛擬核心層級授權時，應取得 ESU Datacenter 版本。
注意事項
多數 WS 2012 授權是以每個處理器或每個核心為基礎銷售 (並非以每個 VM 為基礎)。 基於 ESU 核心計算的目的，假設每 2 個處理器授權 (每個伺服器的最小值) 相當於 16 個實體核心。
範例：
實體核心案例：若客戶擁有 16 核心伺服器且具 Windows Server Datacenter 授權，則當選擇實體核心基礎時，必須取得 16 個 ESU Datacenter 授權。 這涵蓋整個伺服器，不論其上執行的訪客 VM 數目為何。
虛擬核心案例：若客戶擁有三個 8 核心 VM，且具 Windows Server Standard 授權，則當選擇虛擬核心基礎時，需要 24 個 Standard Edition 的 ESU 授權，才能涵蓋所有 VM。 當新增額外 VM 時，必須取得相應額外 ESU 授權。 對於超過八個虛擬核心的 VM (即超過最小值)，請將所有虛擬核心相加以取得正確價格。瞭解指定伺服器的基礎授權狀態可讓您正確判斷所需的擴充安全性更新授權數目。