EXCHANGE2010 DAG 实验报错

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环境:1ad: 100.100.100.1  fqdn=dc.contoso.com ;  2 cas+hub+um 100.100.100.10 fqdn=cas.contoso.com ;   3 mailboxa 100.100.100.11 fqdn=dag1.contoso.com ;  4mailboxb 100.100.100.2 fqdn=dg2.contoso.com


添加高可用组报错

Summary: 1 item(s). 0 succeeded, 1 failed.
Elapsed time: 00:00:01

DAGTEST
Failed
Error:
The task was unable to create the default witness directory on server CAS.contoso.com. Please manually specify a witness directory.
Warning:
The operation wasn't successful because an error was encountered. You may find more details in log file "C:\ExchangeSetupLogs\DagTasks\dagtask_2010-04-29_10-29-00.879_new-databaseavailabiltygroup.log".

Exchange Management Shell command attempted:
New-DatabaseAvailabilityGroup -Name 'DAGTEST'
Elapsed Time: 00:00:01



C:\ExchangeSetupLogs\DagTasks\dagtask_2010-04-29_10-29-00.879_new-databaseavailabiltygroup.log 日志内容:

new-databaseavailabiltygroup started on machine DG2.
[2010-04-29T10:29:00] new-dag started
[2010-04-29T10:29:00] commandline:         $scriptCmd = {& $wrappedCmd @PSBoundParameters }
[2010-04-29T10:29:00] Option 'Name' = ''.
[2010-04-29T10:29:00] Option 'WitnessServer' = ''.
[2010-04-29T10:29:00] Option 'WitnessDirectory' = ''.
[2010-04-29T10:29:00] Option 'WhatIf' = ''.
[2010-04-29T10:29:01] The operation wasn't successful because an error was encountered. You may find more details in log file "C:\ExchangeSetupLogs\DagTasks\dagtask_2010-04-29_10-29-00.879_new-databaseavailabiltygroup.log".
[2010-04-29T10:29:01] WriteError! Exception = Microsoft.Exchange.Management.Tasks.DagFswUnableToBindWitnessDirectoryException: The task was unable to create the default witness directory on server CAS.contoso.com. Please manually specify a witness directory.
   在 Microsoft.Exchange.Management.Common.FileShareWitness.Initialize()
   在 Microsoft.Exchange.Management.SystemConfigurationTasks.NewDatabaseAvailabilityGroup.InternalValidate()


可以确定的相互间我能正常访问CAS.CONTOSO.COM DAG1.CONTOSO.COM DG2.CONTOSO.COM