man qvm-block ... qvm-block -a [options] <device> <vm-name> while in fact it is
qvm-block --help ... qvm-block -a [options] <vm-name> <vm-name>:<device> (same error with https://www.qubes-os.org/doc/dom0-tools/qvm-block/) -- You received this message because you are subscribed to the Google Groups "qubes-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to qubes-users+unsubscr...@googlegroups.com. To post to this group, send email to firstname.lastname@example.org. To view this discussion on the web visit https://groups.google.com/d/msgid/qubes-users/d49fff5c-d4c4-4807-bf69-8b823dbd32a0%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.