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   dmsetup    ( 8 )

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Команды (Commands)

clear device_name Destroys the table in the inactive table slot for device_name.

create device_name [-n|--notable|--table table|table_file] [--readahead [+]sectors|auto|none] [-u|--uuid uuid] [--addnodeoncreate|--addnodeonresume] Creates a device with the given name. If table or table_file 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 the device will appear in table and for live device the node /dev/mapper/device_name is created. See below for more information on the table format.

create --concise [concise_device_specification] Creates one or more devices from a concise device specification. Each device is specified by a comma- separated list: name, uuid, minor number, flags, comma- separated table lines. Flags defaults to read-write (rw) or may be read-only (ro). Uuid, minor number and flags are optional so those fields may be empty. A semi-colon separates specifications of different devices. Use a backslash to escape the following character, for example a comma or semi-colon in a name or table. See also CONCISE FORMAT below.

deps [-o options] [device_name...] Outputs a list of devices referenced by the live table for the specified device. Device names on output can be customised by following options: devno (major and minor pair, used by default), blkdevname (block device name), devname (map name for device-mapper devices, equal to blkdevname otherwise).

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 -c|-C|--columns [--count count] [--interval seconds] [--noheadings] [-o fields] [-O|--sort sort_fields] [--nameprefixes] [--separator separator] [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] [-o options] [--exec command] [--tree] 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. Device names on output can be customised by following options: devno (major and minor pair, used by default), blkdevname (block device name), devname (map name for device-mapper devices, equal to blkdevname otherwise). --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; blkdevname; 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.

mangle [device_name...] Ensure existing device-mapper device_name and UUID is in the correct mangled form containing only whitelisted characters (supported by udev) and do a rename if necessary. Any character not on the whitelist will be mangled based on the --manglename setting. Automatic rename works only for device names and not for device UUIDs because the kernel does not allow changing the UUID of active devices. Any incorrect UUIDs are reported only and they must be manually corrected by deactivating the device first and then reactivating it with proper mangling mode used (see also --manglename).

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] [--retry] [--deferred] device_name... Removes a device. It will no longer be visible to dmsetup. Open devices cannot be removed, but adding --force will replace the table with one that fails all I/O. --deferred will enable deferred removal of open devices - the device will be removed when the last user closes it. The deferred removal feature is supported since version 4.27.0 of the device-mapper driver available in upstream kernel version 3.13. (Use dmsetup version to check this.) If an attempt to remove a device fails, perhaps because a process run from a quick udev rule temporarily opened the device, the --retry option will cause the operation to be retried for a few seconds before failing. Do NOT combine --force and --udevcookie, as udev may start to process udev rules in the middle of error target replacement and result in nondeterministic result.

remove_all [-f|--force] [--deferred] Attempts to remove all device definitions i.e. reset the driver. This also runs mknodes afterwards. Use with care! Open devices cannot be removed, but adding --force will replace the table with one that fails all I/O. --deferred will enable deferred removal of open devices - the device will be removed when the last user closes it. The deferred removal feature is supported since version 4.27.0 of the device-mapper driver available in upstream kernel version 3.13.

rename device_name new_name Renames a device.

rename device_name --setuuid uuid Sets the uuid of a device that was created without a uuid. After a uuid has been set it cannot be changed.

resume device_name... [--addnodeoncreate|--addnodeonresume] [--noflush] [--nolockfs] [--readahead [+]sectors|auto|none] 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.

splitname device_name [subsystem] Splits given device name into subsystem constituents. The default subsystem is LVM. LVM currently generates device names by concatenating the names of the Volume Group, Logical Volume and any internal Layer with a hyphen as separator. Any hyphens within the names are doubled to escape them. The precise encoding might change without notice in any future release, so we recommend you always decode using the current version of this command.

stats command [options] Manages IO statistics regions for devices. See dmstats(8) for more details.

status [--target target_type] [--noflush] [device_name...] Outputs status information for each of the device's targets. With --target, only information relating to the specified target type any is displayed. With --noflush, the thin target (from version 1.3.0) doesn't commit any outstanding changes to disk before reporting its statistics.

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 [--concise] [--target target_type] [--showkeys] [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. Real encryption keys are suppressed in the table output for crypt and integrity targets unless the --showkeys parameter is supplied. Kernel key references prefixed with : are not affected by the parameter and get displayed always (crypt target only). With --concise, the output is presented concisely on a single line. Commas then separate the name, uuid, minor device number, flags ('ro' or 'rw') and the table (if present). Semi-colons separate devices. Backslashes escape any commas, semi-colons or backslashes. See CONCISE FORMAT below.

targets Displays the names and versions of the currently-loaded targets.

udevcomplete cookie Wake any processes that are waiting for udev to complete processing the specified cookie.

udevcomplete_all [age_in_minutes] Remove all cookies older than the specified number of minutes. Any process waiting on a cookie will be resumed immediately.

udevcookie List all existing cookies. Cookies are system-wide semaphores with keys prefixed by two predefined bytes (0x0D4D).

udevcreatecookie Creates a new cookie to synchronize actions with udev processing. The output is a cookie value. Normally we don't need to create cookies since dmsetup creates and destroys them for each action automatically. However, we can generate one explicitly to group several actions together and use only one cookie instead. We can define a cookie to use for each relevant command by using --udevcookie option. Alternatively, we can export this value into the environment of the dmsetup process as DM_UDEV_COOKIE variable and it will be used automatically with all subsequent commands until it is unset. Invoking this command will create system-wide semaphore that needs to be cleaned up explicitly by calling udevreleasecookie command.

udevflags cookie Parses given cookie value and extracts any udev control flags encoded. The output is in environment key format that is suitable for use in udev rules. If the flag has its symbolic name assigned then the output is DM_UDEV_FLAG_<flag_name> = '1', DM_UDEV_FLAG<flag_position> = '1' otherwise. Subsystem udev flags don't have symbolic names assigned and these ones are always reported as DM_SUBSYSTEM_UDEV_FLAG<flag_position> = '1'. There are 16 udev flags altogether.

udevreleasecookie [cookie] Waits for all pending udev processing bound to given cookie value and clean up the cookie with underlying semaphore. If the cookie is not given directly, the command will try to use a value defined by DM_UDEV_COOKIE environment variable.

version Outputs version information.

wait [--noflush] 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. With --noflush, the thin target (from version 1.3.0) doesn't commit any outstanding changes to disk before reporting its statistics.

wipe_table device_name... [-f|--force] [--noflush] [--nolockfs] Wait for any I/O in-flight through the device to complete, then replace the table with a new table that fails any new I/O sent to the device. If successful, this should release any devices held open by the device's table(s).