1@example 2@c man begin SYNOPSIS 3usage: qemu-nbd [OPTION]... @var{filename} 4@c man end 5@end example 6 7@c man begin DESCRIPTION 8 9Export QEMU disk image using NBD protocol. 10 11@c man end 12 13@c man begin OPTIONS 14@table @option 15@item @var{filename} 16 is a disk image filename 17@item -p, --port=@var{port} 18 port to listen on (default @samp{10809}) 19@item -o, --offset=@var{offset} 20 offset into the image 21@item -b, --bind=@var{iface} 22 interface to bind to (default @samp{0.0.0.0}) 23@item -k, --socket=@var{path} 24 Use a unix socket with path @var{path} 25@item -f, --format=@var{format} 26 Set image format as @var{format} 27@item -r, --read-only 28 export read-only 29@item -P, --partition=@var{num} 30 only expose partition @var{num} 31@item -s, --snapshot 32 use @var{filename} as an external snapshot, create a temporary 33 file with backing_file=@var{filename}, redirect the write to 34 the temporary one 35@item -l, --load-snapshot=@var{snapshot_param} 36 load an internal snapshot inside @var{filename} and export it 37 as an read-only device, @var{snapshot_param} format is 38 'snapshot.id=[ID],snapshot.name=[NAME]' or '[ID_OR_NAME]' 39@item -n, --nocache 40@itemx --cache=@var{cache} 41 set cache mode to be used with the file. See the documentation of 42 the emulator's @code{-drive cache=...} option for allowed values. 43@item --aio=@var{aio} 44 choose asynchronous I/O mode between @samp{threads} (the default) 45 and @samp{native} (Linux only). 46@item --discard=@var{discard} 47 toggles whether @dfn{discard} (also known as @dfn{trim} or @dfn{unmap}) 48 requests are ignored or passed to the filesystem. The default is no 49 (@samp{--discard=ignore}). 50@item -c, --connect=@var{dev} 51 connect @var{filename} to NBD device @var{dev} 52@item -d, --disconnect 53 disconnect the specified device 54@item -e, --shared=@var{num} 55 device can be shared by @var{num} clients (default @samp{1}) 56@item -f, --format=@var{fmt} 57 force block driver for format @var{fmt} instead of auto-detecting 58@item -t, --persistent 59 don't exit on the last connection 60@item -v, --verbose 61 display extra debugging information 62@item -h, --help 63 display this help and exit 64@item -V, --version 65 output version information and exit 66@end table 67 68@c man end 69 70@ignore 71 72@setfilename qemu-nbd 73@settitle QEMU Disk Network Block Device Server 74 75@c man begin AUTHOR 76Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>. 77This is free software; see the source for copying conditions. There is NO 78warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 79@c man end 80 81@c man begin SEEALSO 82qemu-img(1) 83@c man end 84 85@end ignore 86