![]() ![]() Note: In some organizations, the security policy prohibits granting Create Computer objects permission to individual user accounts. Note that VCOs for availability groups that you have deleted are not automatically deleted in Active Directory and count against your 10 VCO default limit unless they are manually deleted. You can avoid this by granting the permission explicitly to the WSFC cluster's CNO. After 10 VCOs are created, the creation of additional VCOs will fail. ![]() In Active Directory, a CNO by default does not have Create Computer objects permission explicitly and can create 10 virtual computer objects (VCOs). The cluster name object (CNO) of WSFC cluster that is hosting the availability group must have Create Computer objects permission. For information about prefix naming rules for DNS names, see Assigning Domain Names. If you have two WSFC clusters that are controlled by the same Active Directory and you try to create availability group listeners in both of clusters using names with more than 15 characters and an identical 15 character prefix, you will get an error reporting that the Virtual Network Name resource could not be brought online. NetBIOS recognizes only the first 15 chars in the dns_name. Usually, you will need to ask your network administrators for the static IP addresses. If you are setting up an availability group listener across multiple subnets and plan to use static IP addresses, you need to get the static IP address of every subnet that hosts an availability replica for the availability group for which you are creating the listener. You must be connected to the server instance that hosts the primary replica. Using a static IP address is recommended, although not required, for multiple subnet configurations. For more information, see To Create An Additional Listener for an Availability Group (Optional), later in this topic. After creating a listener through SQL Server, you can use Windows PowerShell for failover clusters or the WSFC Failover Cluster Manager to create additional listeners. ![]() However, some customer scenarios require multiple listeners for one availability group. Typically, each availability group requires only one listener. You can create only one listener per availability group through SQL Server.If a listener already exists and you want to create an additional listener, see To Create An Additional Listener for an Availability Group (Optional), later in this topic. ![]()
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