slow disk IO and general performance

[ransona]

Very slow server performance has been linked to the icy box external USB C HDD enclosure. Reboot of server did not resolve issue but reboot of icy box and server did. Issue can be detected with:

htop - gives constant Disk IO at 100%. normally this fluctutates allow if pipeline etc is running it might be constantly high.

dmesg | grep -i usb - gives a error 'usb 4-3.X: reset SuperSpeed Plus Gen 2x1 USB device number Y using xhci_hcd'. this resetting occurs repeatedly and can be linked to USB comms issues.

sudo dmesg -w - gives error '[409061.212680] usb 4-3.2.1: reset SuperSpeed Plus Gen 2x1 USB device number 6 using xhci_hcd'

Today we switched from the USB-C x10 port to the x20 port and for now the issue has no reappeared.

May be similar to:
openzfs/zfs#11741