Any suggestion/ solution much appreciated.
I have partitioned hdd (500GB) for OMV OS (17GB) and rest been using as downloads directory (+ 500GB SSD merged) for transmission/radarr. I have 500 GB SSD just for docker and containers & 5 HDDs (4 10TB + 1 14TB) for media storage. I have been using plex/radarr/transmission with this setup for 2 months now no issues. I added 2 rsync jobs to sync datas between those 4 HDDs two days ago and that's when the problem started. I have already stopped rsync jobs. But still wait=IO is almost 90% whenever I try to move any files between disks. I looked into system drive its still at 5GB used with plenty of extra space. SMART all the HDDS/SSDs they are all good. One weird thing is there are lots of docker/overlay2/merged files when I check df -h.
Just want to get right path for troubleshooting. Still learning.
Please find the attachments for reference.