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Hi, guys, I have add devid support for EFI, (not putback yet) and test it with a zfs mirror, now the mirror can recover even a usb harddisk is unplugged and replugged into a different usb port. But there is still something need to improve. I''m far from zfs expert, correct me if I''m wrong. First, zfs should sense the hotplug event. I use zfs status to check the status of the