Changing all Disks to using VirtIO, the problem disappeared. I'm gonna call it solved, though I guess there should be a warning about using any other block device virtualization driver.
We changed the disk type to VirtIO for several VMs, now the problem is solved for these VMs.
Seems that not using VirtIO is not safe. Any other experiences on that?
Can't access the specs right now; will deliver them later. I'll give you some pveperf-stats then, too .
Additional Information
For my part, I'll put my emphasis on a configuration issue (i.e. how proxmox is configured, and on that matter it has not been customized yet), due to the following...
Cheers,
since I started using proxmox, I am having serious issues in "high" (i.e. peak) I/O cases.
Setup description
Computiation power and memory is not an issue. The system is running on a HW-Managed RAID5 array, alltogether ~8TiB, about 20% used. About 10-15 VMs are running on it with...
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