QEMU-NBD

NAME

qemu−nbd − QEMU Disk Network Block Device Server

SYNOPSIS

usage: qemu-nbd [ OPTION ]... filename

DESCRIPTION

Export QEMU disk image using NBD protocol.

OPTIONS

filename

 is a disk image filename

−p, −−port=port

  port to listen on (default B<10809>)

−o, −−offset=offset

  offset into the image

−b, −−bind=iface

  interface to bind to (default B<0.0.0.0>)

−k, −−socket=path

  Use a unix socket with path I<path>

−f, −−format=format

  Set image format as I<format>

−r, −−read−only

  export read−only

−P, −−partition=num

  only expose partition I<num>

−s, −−snapshot

  use I<filename> as an external snapshot, create a temporary
  file with backing_file=I<filename>, redirect the write to
  the temporary one

−l, −−load−snapshot=snapshot_param

  load an internal snapshot inside I<filename> and export it
  as an read−only device, I<snapshot_param> format is
  'snapshot.id=[ID],snapshot.name=[NAME]' or '[ID_OR_NAME]'

−n, −−nocache
−−cache=cache

  set cache mode to be used with the file.  See the documentation of
  the emulator's C<−drive cache=...> option for allowed values.

−−aio=aio

  choose asynchronous I/O mode between B<threads> (the default)
  and B<native> (Linux only).

−−discard=discard

  toggles whether I<discard> (also known as I<trim> or I<unmap>)
  requests are ignored or passed to the filesystem.  The default is no
  (B<−−discard=ignore>).

−c, −−connect=dev

  connect I<filename> to NBD device I<dev>

−d, −−disconnect

  disconnect the specified device

−e, −−shared=num

  device can be shared by I<num> clients (default B<1>)

−f, −−format=fmt

  force block driver for format I<fmt> instead of auto−detecting

−t, −−persistent

  don't exit on the last connection

−v, −−verbose

  display extra debugging information

−h, −−help

  display this help and exit

−V, −−version

  output version information and exit

SEE ALSO

qemu−img(1)

AUTHOR

Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.