dmsetup-Unix、Linuxコマンド

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NAME

概要

dmsetupヘルプ* [-c | -C | --columns] dmsetup create device_name [-u uuid] [--notable | --table <テーブル> | table_file] dmsetup remove [-f | --force] device_name dmsetup remove_all [-f | --force] dmsetup suspend [-nolockfs] [- noflush] device_name dmsetup resume device_name dmsetup load device_name [--table <table> | table_file] dmsetup clear device_name dmsetup reload device_name [--table <table> | table_file] dmsetup rename device_name new_name dmsetup message device_nameector message dmsetup ls [-target target_type] [--exec command] [--tree [-o options]] dmsetup info [device_name] dmsetup info -c | -C | --columns [-noheadings] [--separator separator] [-o fields] [-O | --sort sort_fields] [device_name] dmsetup deps [device_name] dmsetup status [-target target_type] [device_name] dmsetup table [-target target_type] [device_name] dmsetup wait device_name [event_nr] dmsetup mknodes [device_name] dmsetup targetsdmsetup versiondmsetup setgeometry * device_name cyl head sect start
```
*devmap_name* _major minor_ *devmap_name* _major：minor_
```

説明

dmsetupの最初の引数はコマンドです。 2番目の引数は、論理デバイス名またはuuidです。

*devmap_name* としてコマンドを呼び出すことは、 *dmsetup info -c --noheadings -j* _major_ *-m* _minor_と同等です。

オプション

Tag	Description
*-c	-C
--columns*	Display output in columns rather than as Field: Value lines.
*-j	--major* major
Specify the major number.	*-m
--minor* minor	Specify the minor number.
*-n	--noheadings*
Suppress the headings line when using columnar output.	--noopencount
Tell the kernel not to supply the open reference count for the device.	--notable
When creating a device, don’t load any table.	*-o
--options*	Specify which fields to display.
*-r	--readonly*
Set the table being loaded read-only.	*--readahead [+]<sectors>
auto	none*
Specify read ahead size in units of sectors. The default value is "auto" which allows the kernel to choose a suitable value automatically. The + prefix lets you specify a minimum value which will not be used if it is smaller than the value chosen by the kernel. "None" is equivalent to specifying zero.	--table <table>
Specify a one-line table directly on the command line.	*-u
--uuid*	Specify the uuid.
*-v	--verbose [-v
--verbose]*	Produce additional output.
--version	Display the library and kernel driver version.

コマンド

Tag	Description
create	_device_name [-u uuid] [--notable
--table <table>	table_file]_ Creates a device with the given name. If table_file or <table> is supplied, the table is loaded and made live. Otherwise a table is read from standard input unless --notable is used. The optional uuid can be used in place of device_name in subsequent dmsetup commands. If successful a device will appear as/dev/device-mapper/<device-name>. See below for information on the table format.
deps	[device_name] Outputs a list of (major, minor) pairs for devices referenced by the live table for the specified device.
help	_[-c
-C	--columns]_ Outputs a summary of the commands available, optionally including the list of report fields.
info	[device_name] Outputs some brief information about the device in the form: State: SUSPENDED
ACTIVE, READ-ONLY Tables present: LIVE and/or INACTIVE Open reference count Last event sequence number (used by* wait*) Major and minor device number Number of targets in the live table UUID	info
_[--noheadings] [--separator separator] [-o fields] [-O	--sort sort_fields]_ [device_name] Output you can customise. Fields are comma-separated and chosen from the following list: name, major, minor, attr, open, segments, events, uuid. Attributes are: (L)ive, (I)nactive, (s)uspended, (r)ead-only, read-(w)rite. Precede the list with ’+’ to append to the default selection of columns instead of replacing it. Precede any sort_field with - for a reverse sort on that column.
ls	[--target target_type] [--exec command] [--tree [-o options]] List device names. Optionally only list devices that have at least one target of the specified type. Optionally execute a command for each device. The device name is appended to the supplied command. --tree displays dependencies between devices as a tree. It accepts a comma-separate list of options. Some specify the information displayed against each node: device/nodevice; active, open, rw, uuid. Others specify how the tree is displayed: ascii, utf, vt100; compact, inverted, notrunc.
*load	reload*
_device_name [--table <table>	table_file]_ Loads <table> or table_file into the inactive table slot for device_name. If neither is supplied, reads a table from standard input.
message	device_name sector message Send message to target. If sector not needed use 0.
mknodes	[device_name] Ensure that the node in/dev/mapper for device_name is correct. If no device_name is supplied, ensure that all nodes in/dev/mapper correspond to mapped devices currently loaded by the device-mapper kernel driver, adding, changing or removing nodes as necessary.
remove	_[-f
--force] device_name_ Removes a device. It will no longer be visible to dmsetup. Open devices cannot be removed except with older kernels that contain a version of device-mapper prior to 4.8.0. In this case the device will be deleted when its open_count drops to zero. From version 4.8.0 onwards, if a device can’t be removed because an uninterruptible process is waiting for I/O to return from it, adding --force will replace the table with one that fails all I/O, which might allow the process to be killed.	remove_all
_[-f	--force]_ Attempts to remove all device definitions i.e. reset the driver. Use with care! From version 4.8.0 onwards, if devices can’t be removed because uninterruptible processes are waiting for I/O to return from them, adding --force will replace the table with one that fails all I/O, which might allow the process to be killed. This also runs* mknodes* afterwards.
rename	device_name new_name Renames a device.
resume	device_name Un-suspends a device. If an inactive table has been loaded, it becomes live. Postponed I/O then gets re-queued for processing.
setgeometry	device_name cyl head sect start Sets the device geometry to C/H/S.
status	[--target target_type] [device_name] Outputs status information for each of the device’s targets. With --target, only information relating to the specified target type is displayed.
suspend	[--nolockfs] [--noflush] device_name Suspends a device. Any I/O that has already been mapped by the device but has not yet completed will be flushed. Any further I/O to that device will be postponed for as long as the device is suspended. If there’s a filesystem on the device which supports the operation, an attempt will be made to sync it first unless --nolockfs is specified. Some targets such as recent (October 2006) versions of multipath may support the --noflush option. This lets outstanding I/O that has not yet reached the device to remain unflushed.
table	[--target target_type] [device_name] Outputs the current table for the device in a format that can be fed back in using the create or load commands. With --target, only information relating to the specified target type is displayed.
targets	Displays the names and versions of the currently-loaded targets.
version	Outputs version information.
wait	device_name [event_nr] Sleeps until the event counter for device_name exceeds event_nr. Use -v to see the event number returned. To wait until the next event is triggered, use* info* to find the last event number.

テーブル形式

現在、スナップショットとミラーを実装するより複雑なオプションと一緒に利用できる3つの単純なターゲットタイプがあります。

Tag	Description
linear	destination_device start_sector The traditional linear mapping.
striped	num_stripes chunk_size [destination start_sector]+ Creates a striped area. e.g. striped 2 32/dev/hda1 0/dev/hdb1 0 will map the first chunk (16k) as follows: LV chunk 1 → hda1, chunk 1 LV chunk 2 → hdb1, chunk 1 LV chunk 3 → hda1, chunk 2 LV chunk 4 → hdb1, chunk 2 etc.
error	Errors any I/O that goes to this area. Useful for testing or for creating devices with holes in them.

例

＃2つのディスクを結合するテーブル0 1028160リニア/dev/hda 0 1028160 3903762リニア/dev/hdb 0

＃2つのディスクにまたがってストライプ化するテーブル、＃＃hdbからボリュームの後ろにスペアスペースを追加

0 2056320ストライプ2 32/dev/hda 0/dev/hdb 0 2056320 2875602リニア/dev/hdb 1028160

環境変数

Tag

説明

*DM_DEV_DIR*

デバイスのディレクトリ名。デフォルトは「/dev」で、絶対パスでなければなりません。

作者

thornber@sistina.com

Unix-commands-dmsetup