Hi , My friend Scott Schnoll has published this article with the steps required for the installation of Rollup 1 for Exchange Server 2010 on DAF Members
Installing Update Rollup 1 for Exchange 2010 on DAG Members
Install a Update Rollup on a Database Availability Group Member
Suspend activation for the database copies on the server being updated
- Run the following command in the Exchange Management Shell:
Get-MailboxDatabaseCopyStatus -Server <Server> | Suspend-MailboxDatabaseCopy -ActivationOnly -Confirm:$False -SuspendComment "Install update rollup for Exchange 2010"
Perform a server switchover on the server being updated
- In the console tree, navigate to Server Configuration > Mailbox.
- In the result pane, select the Mailbox server you want.
- In the Actions pane, select Switchover Server.
- In the Switchover server database copies dialog box, do one of the following:
- Accept the default setting of Automatically choose a target server (in which case, the system automatically selects the best Mailbox server for each database being switched over), and then click OK.
- Use the specified server as the target for switchover, click Browse to select a Mailbox server, and then click OK.
Install the update rollup
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Close all Exchange management tools.
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Right-click the update rollup file (.MSP file) you downloaded and select Apply.
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On the Welcome page, click Next.
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On the License Terms page, review the license terms, select I accept the License Terms, and then click Next.
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On the Completion page, click Finish.
Resume activation for the databases on the updated server
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Run the following command in the Exchange Management Shell:
Get-MailboxDatabaseCopyStatus -Server <Server> | Resume-MailboxDatabaseCopy
Perform database switchovers as needed
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In the console tree, navigate to Organization Configuration > Mailbox.
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In the result pane, click the Database Management tab, and then right-click the mailbox database whose copy you want to activate.
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In the action pane, click Activate a Database Copy.
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On the Activate a Database Copy page, click Browse to select the server you updated.
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Select the desired setting for the automatic database mount dial setting on the selected server.
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Click Move to activate the selected passive copy of the database to the updated server.
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On the Completion page, review the following, and then click Finish to close the wizard.
