On Thu, Sep 01, 2022 at 10:30:08AM +0800, Ming Lei wrote: > +ublk block device(``/dev/ublkb*``) is added by ublk driver. Any IO request ^^^ Please insert a space between word and open bracket "(" everywhere. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com libguestfs lets you edit virtual machines. Supports shell scripting, bindings from many languages. http://libguestfs.org