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XenServer 7.1 CU2 sometimes per day all vm's cpu goes high at the same time and this result sometimes in a short hung in the sessions


Mario Wagner

Question

Hello,

 

we have a pool of 2 XenServers 7.1 CU2.

Both hosts have 32 vCPU's (Intel Xeon CPU E5-2667 v4).

Every XenServer hosts 10 terminalservers on it.

On the poolmaster all vm's have 48 vCPU's in total.

On the other host all vm's have 50 vCPU's in total.

 

All terminalservers are with os Windows Server 2016,  VDA 7.15.3000 and distributed by MCS, instead of one (Windows Server 2012 R2, VDA 7.14 and MCS).

 

Sometimes per day all vm's get higher with CPU at the same time and if because of that the CPU of the host reach sometimes 100 % and this result in a short hung of the sessions.

 

To get rid of this problem I turned the overprovisioning of the vCPU's down (before it was 80 vCPU's in total per host), but it helps only a little.

I think, we have this problem since we changed the terminalservers from Windows Server 2012 R2 to Windows Server 2016.

 

Who could help me, to bring back the user experience in that environment to an acceptable state ?

 

kind regards

Mario

 

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