CentOS getting unusable slow over time running at Hyper-V

Micha W

4/19/24, 3:20 PM

I run TWiki 6.1 on a CentOS Stream 9-virtual machine hosted in Hyper-V at Windows10. VMs hostanme is "twiki"

System ran for over a year now without any problems but since some weeks its not responding anymore and I don't have a clue whats going on. After rebooting the VM from Hyper-V its running fast and flawless for quite some time (about a day) but after that nothing seems to work at all. I have several mechanisms to interact with the CentosOS-vm:

accessing the twiki-pages from within a browser: error "The gateway did not receive a timely response from the upstream server or application." after hanging several seconds
using the CentOS adminstrators-webconsole (http://twiki:9090): hangs and gives me "site not found"
using "ssh twiki" at the console: just hangs forever
accessing samba-shares from the explorer (\twiki): hangs several minutes bevor saying "unavailable"
Connecting from Hyper-V-Manager: Doesn't work: It just shows a black Screen, no interaction possible
Shutdown from Hyper-V-Manager doenst work. After several minutes it shows up an error-message
Turning off the VM and restarting it works
There are nightly cronjobs to update usage-statistics and backup the twikisystem. According to /var/log/cron both jobs startet but none of them did something I can see (they have to create some files)

Of course nothing was changed at the VM-Host or the CentOS-guestsystem intentional. They both have automatic updates enabled. I don't know where to start looking for problems. Can be the Hyper-V system, a misconfigured CentOS, the apacheserver, samba, twiki, perl, ... Are there any hints where to start? What I know is even when the system "hangs":

"ping twiki" is fast: <1ms
another VM (Ubuntu) is still working

Some more information:

Host: Win10 Server, 64Bit, CPU: Intel Xeon Silver 4210R, 10 Cores, 128GB Memory
Data from Hyper-V: CPU-usage of every VM: 0-3%
TWiki-VM-Configuration: Memory: 8GB, 2 CPUs
CentOS Memory consumption while running: 3,2GB, CPU-usage: about 2-10%
We're a rather small company so there are not many users trying to access the TWiki at the same time

0 + 2

performance

hyper-v

centos

twiki

apache2

John Hanley

4/21/24, 1:12 AM

Add details about disk space usage and swap space usage. Running low on the first causes performance problems, using the second will cause performance problems.

Micha W

4/21/24, 1:23 PM

diskspace: 25,7GB used out of 70GB disk-size Swap: 0GB used out of 4,27 available RAM: 3GB used out of 8GB https://postimg.cc/R300BT1j

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EN: CentOS getting unusable slow over time running at Hyper-V

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