I am facing a performance issue on my environment. I am using the official docker image on a Synology NAS. On file based backups, which take 1-5 minutes, everything is fine. But as soon as an incremental image backup on Windows 10 machines is started. the load on the Synology NAS increases and reaches values of 20-30. When this happens the NAS is completely unresponsive and unusable. I already limited the docker container resources and set the CPU priority to “minimum” and the memory to 4GB (I have 10 GB available). When looking at htop I can see the following:
Here especially the gray bars are interesting. Those indicate that the CPUs are waiting for IO, so it kind of seems to be related to storage?
I wanted to limit the docker container to only use 2 CPUs out of 4, but I was not able to achieve that.
Is anybody facing similar issues? Is there anything I can do to make sure that a backup is not “shutting down” my Synology NAS?