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Remove-DatabaseAvailabilityGroupServer

Use the Remove-DatabaseAvailabilityGroupServer cmdlet to remove a Mailbox server from a database availability group (DAG). Exchange PowerShell reference

From the Exchange PowerShell reference 7 parameters Its page in the reference

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Parameters

7 in the Exchange PowerShell reference
-IdentityThe Identity parameter specifies the name of the DAG from which you're removing the server.
-MailboxServerThe MailboxServer parameter specifies the Mailbox server to remove from the DAG.
-ConfigurationOnlyThe ConfigurationOnly switch remove the Mailbox server from the DAG object in Active Directory.
-Confirm, -cfThe Confirm switch specifies whether to show or hide the confirmation prompt.
-DomainControllerThe DomainController parameter specifies the domain controller that's used by this cmdlet to read data from or write data to Active Directory.
-SkipDagValidationThe SkipDagValidation switch specifies whether to bypass the validation of the DAG's quorum model and the health check on the DAG's witness when removing members from the DAG.
-WhatIf, -wiThe WhatIf switch shows what the command does without making any changes.