Exchange 2013 SP1 CU8 installation stuck

Good Morning,

I'm just installing CU8 for Exchange 2013 on a DAG Member (only mailbox role installed), and setup is stuck at 49% of "Mailbox Role: Client Access service" for more than 2 hours now.

The ExchangeSetup logfile says:

[04/15/2015 06:44:20.0582] [2] Active Directory session settings for 'New-PerfCounters' are: View Entire Forest: 'True', Configuration Domain Controller: 'srv-dc02.oostvogels.com', Preferred Global Catalog: 'dc02.contoso.com', Preferred Domain Controllers: '{ dc02.contoso.com }'
[04/15/2015 06:44:20.0582] [2] User specified parameters:  -DefinitionFileName:'ServiceProxyPoolCounters.xml'
[04/15/2015 06:44:20.0582] [2] Beginning processing new-PerfCounters
[04/15/2015 06:44:20.0582] [2] Processing file: C:\Program Files\Microsoft\Exchange Server\V15\Setup\Perf\ServiceProxyPoolCounters.xml
[04/15/2015 06:44:20.0582] [2] Performance counter name is Proxy Instance Count, type is NumberOfItems32.
[04/15/2015 06:44:20.0582] [2] Performance counter name is Current Outstanding Calls, type is NumberOfItems32.
[04/15/2015 06:44:20.0582] [2] Performance counter name is Total Number of Calls, type is NumberOfItems32.
[04/15/2015 06:44:20.0582] [2] Performance counter name is Calls/sec, type is RateOfCountsPerSecond32.
[04/15/2015 06:44:20.0582] [2] Performance counter name is Average Latency, type is AverageCount64.
[04/15/2015 06:44:20.0582] [2] Performance counter name is Base for Average Latency, type is AverageBase.
[04/15/2015 06:44:20.0582] [2] Performance counter category name is 'MSExchange ServiceProxyPool'.
[04/15/2015 06:44:20.0738] [2] Performance counter category name is 'MSExchange ServiceProxyPool'.
[04/15/2015 06:44:22.0255] [2] Ending processing new-PerfCounters

Does anyone have any suggestions or did you experience a similar issue?

I also can see some events like this:

Cmdlet failed. Cmdlet New-PerfCounters, parameters -DefinitionFileName "ADDriverCachePerformanceCounters.xml".

Thanks and best regards,

Sebastian