Hello Forum!!
I have an ESXi 5.5 running on a DELL R720 with 2 6-core Prozessors an 96 GB RAM.
On this Server are 4 Windows 2012R2 Server. 2 Domain Controler, 1 Exchange 2013 and 1 RDS Server. All servers have the last updates.
The RDS Server has 6 cores an 48GB of RAM for about 55 Users running Office 2013 and Management Software based on SQL Server.
The clients are connected via LAN and WAN. The Clientdevices are Thinclients, WIN7 and WIN8 PCs.
The whole system is running performantly, the RDS Server is running at 50 - 70 Percent of Prozessorutilization and using about 20-25 GB Ram (as TASKMANAGER is displaying). Excel and Winword ie. are loading in about 3-5 seconds.
First I recognized, that he RDS Server starts slowing down, when some users (no special users) disconnect their sessions. When about 8-10 sessions are disconnected, loading Excel or Word takes about 30sec. to 1 minute. Opening TASKManager takes about the same time.
When I was logging off 4-6 disconnected users, no matter which users, the server is comming back to the normal performance. The same occours when some people are coming back from the break at about 10:00, the server also goes back to normal performance.
I did not see any changes in Prozessor-Utilization and only a small amount of memory is becoming free.
i.e: 55 Users connected, 7 disconnected, 65% Utilization, 26GB used ---> slow
loging off 5 Users: 62% Utilization, 24GB used ----> performing system
In another thread, a suggestion was setting the autologoff time down to 1 minute. First I set it from 6 to 3 hours, for 2 days no problem occours, then I set it to 30 min, 1 week no problems, now its 1 minute. No problems for about one week, too.
Today the problem occours again.
Ie. unable to start Process Monitor, with about some patience the Gui of Processmonitor appeared after about 15 min. Unable to unload Office Scan. After a long time the gui for entering the unload password appeared, but I was unable to key in the password.
After Processmonitor-Gui was visible I did some testing:
Doble Click Excel, no process visible in Process Monitor. About 30-45 sec later, excel.exe is visible and availiable in about 3-5 sec. From becoming visible as a process and excel is availible for use in 3-5 sec is normal performance.
Disk IO from the view of the resource manager is about 3-6 MB per sec. In the vSphere Client I found the same counts.
Nothing special occours, when the server is slow.
IE. today I resolved the problem, with killing some console tasks (pcntmon.exe) from the Office Scan AV Scanner.
I was installaing check_mk in an instance on the esx. I did not found any relavant information or reason, what makes the server slow.
Today I heard from a friend, that in their company, they had a similar problem with some windows 7 machines. Their solution was in kb3083710. But this patch is only for windows 7 an 2008r2.
Does anybody know someting, that a similar patch is availiable for windows 2012r2 ??
Thanks a lot for any ideas and help.
Regards from Austria
Reinhold
