as I mentioned in the previous answer. If there is a spare, you will return. If you don't have backup, all your data is garbage. The best solution is to install the Guest software directly from Xenserver.

https://support.citrix.com/article/CTX235403

Download and install 64bit from the link below. On the xcp-center side, you can monitor things like a memory disk, and you can solve the driver deletion problem that xcp-ng guest software could not do during the windows update.

8.2.2.200-RC1 (and 8.2.2-beta) After installing the driver in this version (Windows 10 1809), access to the system was not possible.

I've tried several recovery by installing Windows 10 iso. Start repair, Return, etc. but the result is the same.

Blue screen at boot error: INACCESSIBLE BOOT DEVICE

If you have a backup, go back or trash the virtual computer.

I applied the video below but the result is frustrating. The file "\ windows \ system32 \ config \ RegBack" appears to be empty.

https://www.youtube.com/watch?v=KAHAquUaR24

Xcp-ng Center from the menu above VM > Start/Shut down > Start in Recovery Mode I start by following the steps, but the following warning comes.

No bootable device
Powering off in 30 seconds.
How do we turn on safe mode on xcp-center in windows 10. I tried, but I can't open it.

During VM export, the ssh connection is gone and the result is frustrating. the disk of the virtual computer does not appear at all.
Xcp-ng 8.0 use. I think he sent the disk to eternity.

I started exporting before the virtual server shuts down, and then I canceled the process, such as the goal of how to solve the problem there. Is there a solution in this regard.

[23:32 xcp-ng ~]# xe vm-shutdown uuid=0bfdc8b6-64bb-1e8a-d1d0-23f780e708c0
You attempted an operation on a VM that was not in an appropriate power state at the time; for example, you attempted to start a VM that was already running.  The parameters returned are the VM's handle, and the expected and actual VM state at the time of the call.
vm: 0bfdc8b6-64bb-1e8a-d1d0-23f780e708c0 (vm-linux.com.tr)
expected: running
actual: halted
[23:32 xcp-ng ~]# xe vm-start uuid=0bfdc8b6-64bb-1e8a-d1d0-23f780e708c0
The server failed to handle your request, due to an internal error.  The given message may give details useful for debugging the problem.
message: xenopsd internal error: Storage_error ([S(Illegal_transition);[[S(Activated);S(RO)];[S(Activated);S(RW)]]])

@ruskofd I turned off the C1E and C States features. Problem is solved. But SSD performance is very low compared to windows machine.

Hi,
I cannot upgrade the vCPU after I migrate virtual machines with Ubuntu18 operating system to xcp-ng8.0 new machine. It seems stuck at the highest value I have defined on the previous server. This may have caused the problem. The old server has a maximum value of 16 vcpu. The new server has a value of 64 vcpu, but I cannot raise it. How do I edit the bios or processor model of the virtual machine on xcp-center?

@tuxen said in xcp-ng CPU low performance issue:

Start a VM boot storm (or a stress test inside one or more VMs) in order to generate some CPU load.

Thank you very much for your information. I tried and saw the following results in real time.Every 2,0s: xenpm start 1 | grep -i "avg freq" Thu Nov 28 13:27:00 2019

Avg freq 2521200 KHz
Avg freq 2689280 KHz
Avg freq 2836350 KHz
Avg freq 2689280 KHz
Avg freq 2731300 KHz
Avg freq 2689280 KHz
Avg freq 2773320 KHz
Avg freq 2752310 KHz
Avg freq 2689280 KHz
Avg freq 2689280 KHz
Avg freq 2710290 KHz
Avg freq 2710290 KHz
Avg freq 2689280 KHz
Avg freq 2710290 KHz

ll performance settings in the server bios settings are as follows.

System Profile Current Value Pending Value
CPU Power Management System DBPM (DAPC)
Memory Frequency Maximum Performance
Turbo Boost Enabled
C1E Enabled
C States Enabled
Write Data CRC Disabled
Memory Patrol Scrub Standard
Memory Refresh Rate 1x
Uncore Frequency Dynamic
Energy Efficient Policy Balanced Performance
Number of Turbo Boost Enabled Cores for Processor 1 All
Number of Turbo Boost Enabled Cores for Processor 2 All
Monitor/Mwait Enabled
Workload Profile Not Available
CPU Interconnect Bus Link Power Management Enabled
PCI ASPM L1 Link Power Management Enabled

CPU Power Management Some options include = Performans Per Watt (OS ), Performans Per Watt (DAPC ), Performance, Workstation Performans, Custom
Workload Profile Some options include = HPC Profile =,Low Latency Optimized Prodile, Virtualization Optimized Performans Profile, Virtualization Optimized Performans Per Watt Profile, Database Optimized Performans Profile, Database Optimized Performans Per Watt Profile, SDS Optimized Performans Profile and SDS Optimized Performans Per Watt Profile
I have tried the above options one by one but the result has not changed.

@tuxen said in xcp-ng CPU low performance issue:

xenpm start 1 | grep -i "avg freq"

[06:13 xcp-ng-lmtguftk ~]# xenpm start 1 | grep -i "avg freq"
Avg freq 64 KHz
Avg freq 64 KHz
Avg freq 64 KHz
Avg freq 64 KHz
Avg freq 64 KHz
Avg freq 64 KHz
Avg freq 64 KHz
Avg freq 64 KHz
Avg freq 64 KHz
Avg freq 64 KHz
Avg freq 64 KHz
Avg freq 64 KHz

@Danp said in xcp-ng CPU low performance issue:

How are you testing? Also, might help if you told us the results.

[19:10 xcp-ng-lmtguftk ~]# sudo xenpm get-cpufreq-para
cpu id : 0
affected_cpus : 0
cpuinfo frequency : max [2101000] min [800000] cur [2101000]
scaling_driver : acpi-cpufreq
scaling_avail_gov : userspace performance powersave ondemand
current_governor : performance
scaling_avail_freq : *2101000 2100000 2000000 1900000 1800000 1700000 1600000 150 0000 1400000 1300000 1200000 1100000 1000000 900000 800000
scaling frequency : max [2101000] min [800000] cur [2101000]
turbo mode : enabled

max 2.10 ghz but The processor can go up to 3.2 GHz under normal conditions.

xenpm start & sleep 5; killall -s SIGINT xenpm

The maximum speed of the task manager on windows is 2.10ghz.