Some follow-up info...when plugging USB in, dmesg shows the following:
Code:
usb-storage: device found at 69
usb-storage: waiting for device to settle before scanning
usb-storage: device scan complete
usb 1-12: reset high speed USB device number 69 using ehci_hcd
usb 1-12: reset high speed USB device number 69 using ehci_hcd
usb 1-12: reset high speed USB device number 69 using ehci_hcd
usb 1-12: reset high speed USB device number 69 using ehci_hcd
usb 1-12: reset high speed USB device number 69 using ehci_hcd
scsi 14:0:0:0: Device offlined - not ready after error recovery
I've tried increasing the kernel module (usb_storage) delay with both a config file and kernel option at boot with no success. Interestingly, I can sometimes see the drives in my VM if I reboot with them still attached. But disconnecting and reconnecting never recovers.
I am currently on Parallels Business Edition Version 16.1.2 (49151)...as far as I can remember, it broke two updates ago and affects all versions of Linux for me.
CentOS 6.10 (2.6.32-754.33.1.el6.x86_64)
Ubuntu 18.04 (4.15.0-112-generic)