Warning: Autoactivation Reading From Disk Instead of Lvmetad.
Provided by: lvm2_2.02.176-iv.1ubuntu3_amd64 
Proper name
pvscan - List all concrete volumes
SYNOPSIS
pvscan option_args [ option_args ] [ position_args ]
Description
pvscan scans all supported LVM block devices in the system for PVs. Scanning with lvmetad pvscan operates differently when used with the lvmetad(8) daemon. Scanning disks is required to read LVM metadata and place LVM PVs. Once read, lvmetad caches the metadata then that LVM commands tin can read information technology without repeatedly scanning disks. This is helpful because scanning disks is time consuming, and frequent scanning may interfere with the normal work of the arrangement and disks. When lvmetad is non used, LVM commands revert to scanning disks to read metadata. Any LVM control that needs metadata volition scan disks for information technology; running the pvscan command is not necessary for the sake of other LVM commands. When lvmetad is used, LVM commands avoid scanning disks by reading metadata from lvmetad. When new disks appear, they must exist scanned so their metadata can exist cached in lvmetad. This is washed by the command pvscan --cache, which scans disks and passes the metadata to lvmetad. The pvscan --enshroud command is typically run automatically by organisation services when a new device appears. Users do not generally need to run this command if the arrangement and lvmetad are running properly. Many scripts incorporate unnecessary pvscan (or vgscan) commands for historical reasons. To avoid disrupting the organisation with extraneous disk scanning, an ordinary pvscan (without --cache) will simply read metadata from lvmetad similar other LVM commands. It does not do anything beyond displaying the electric current land of the cache. · When given specific device name arguments, pvscan --cache will merely read the named devices. · LVM udev rules and systemd services are used to initiate automatic device scanning. · To prevent devices from being scanned by pvscan --enshroud, add them to lvm.conf(five) devices/global_filter. The devices/filter setting does non use to system level scanning. For more data, see: lvmconfig --withcomments devices/global_filter · If lvmetad is started or restarted after devices are visible, or if the global_filter has inverse, then all devices must be rescanned for metadata with the control pvscan --cache. · lvmetad does not enshroud older metadata formats, e.g. lvm1, and will be temporarily disabled if they are seen. · To notify lvmetad almost a device that is no longer present, the major and modest numbers must be given, non the path. Automatic activation When event-driven organisation services notice a new LVM device, the first footstep is to automatically browse and enshroud the metadata from the device. This is done by pvscan --cache. A 2d footstep is to automatically activate LVs that are present on the new device. This auto-activation is done past the aforementioned pvscan --cache command when the selection --activate ay is included. Motorcar-activation of VGs or LVs can be enabled/disabled using: lvm.conf(five) activation/auto_activation_volume_list For more information, encounter: lvmconfig --withcomments activation/auto_activation_volume_list When this setting is undefined, all LVs are automobile-activated (when lvm is fully integrated with the event-driven arrangement services.) When a VG or LV is not auto-activated, traditional activation using vgchange or lvchange --activate is needed. · pvscan car-activation can be just washed in combination with --cache. · Auto-activation is designated past the "a" statement in --activate ay. This is meant to distinguish system generated commands from explicit user commands, although it tin can be used in any activation control. Whenever it is used, the auto_activation_volume_list is applied. · Auto-activation is not however supported for LVs that are role of partial or clustered volume groups.
USAGE
Display PV information. pvscan [ -e|--exported ] [ -n|--novolumegroup ] [ -s|--curt ] [ -u|--uuid ] [ COMMON_OPTIONS ] Populate the lvmetad cache past scanning PVs. pvscan --cache [ -b|--groundwork ] [ -a|--activate ay ] [ -j|--major Number ] [ --minor Number ] [ COMMON_OPTIONS ] [ String|PV ... ] Common options for control: [ --ignorelockingfailure ] [ --reportformat basic|json ] Common options for lvm: [ -d|--debug ] [ -h|--aid ] [ -q|--quiet ] [ -t|--exam ] [ -five|--verbose ] [ -y|--yes ] [ --commandprofile String ] [ --config String ] [ --driverloaded y|n ] [ --longhelp ] [ --profile String ] [ --version ]
OPTIONS
-a|--actuate y|due north|ay Auto-activate LVs in a VG when the PVs scanned have completed the VG. (Only ay is applicable.) -b|--groundwork If the operation requires polling, this selection causes the control to return before the performance is complete, and polling is done in the background. --enshroud Scan i or more than devices and transport the metadata to lvmetad. --commandprofile String The command contour to use for control configuration. Run across lvm.conf(5) for more information about profiles. --config String Config settings for the command. These override lvm.conf settings. The String arg uses the same format every bit lvm.conf, or may employ section/field syntax. See lvm.conf(five) for more information virtually config. -d|--debug ... Set debug level. Repeat from 1 to six times to increment the detail of messages sent to the log file and/or syslog (if configured). --driverloaded y|n If set to no, the command will not attempt to employ device-mapper. For testing and debugging. -eastward|--exported Only show PVs belonging to exported VGs. -h|--assistance Display assistance text. --ignorelockingfailure Allows a control to continue with read-but metadata operations later on locking failures. --longhelp Display long help text. -j|--major Number The major number of a device. --small-scale Number The small-scale number of a device. -n|--novolumegroup Only show PVs non belonging to any VG. --contour String An allonym for --commandprofile or --metadataprofile, depending on the command. -q|--quiet ... Suppress output and log messages. Overrides --debug and --verbose. Repeat once to as well suppress any prompts with respond 'no'. --reportformat basic|json Overrides current output format for reports which is divers globally by the report/output_format setting in lvm.conf. basic is the original format with columns and rows. If there is more than one report per control, each study is prefixed with the report proper name for identification. json produces report output in JSON format. See lvmreport(7) for more information. -s|--short Short listing format. -t|--exam Run in test mode. Commands volition not update metadata. This is implemented by disabling all metadata writing only nevertheless returning success to the calling part. This may lead to unusual mistake letters in multi-stage operations if a tool relies on reading dorsum metadata it believes has changed but hasn't. -u|--uuid Show UUIDs in addition to device names. -v|--verbose ... Set verbose level. Echo from i to 4 times to increase the detail of messages sent to stdout and stderr. --version Brandish version information. -y|--yes Do not prompt for confirmation interactively but always assume the answer yes. Use with extreme caution. (For automatic no, see -qq.)
VARIABLES
PV Physical Volume proper noun, a device path under /dev. For commands managing physical extents, a PV positional arg more often than not accepts a suffix indicating a range (or multiple ranges) of physical extents (PEs). When the first PE is omitted, it defaults to the start of the device, and when the last PE is omitted it defaults to end. Start and end range (inclusive): PV[: PE - PE]... Start and length range (counting from 0): PV[: PE + PE]... String See the selection description for information nearly the string content. Size[UNIT] Size is an input number that accepts an optional unit. Input units are always treated every bit base two values, regardless of capitalization, e.yard. 'grand' and 'Thou' both refer to 1024. The default input unit is specified by letter, followed by |Unit of measurement. Unit represents other possible input units: bBsSkKmMgGtTpPeE. b|B is bytes, s|S is sectors of 512 bytes, k|K is kilobytes, thousand|M is megabytes, g|K is gigabytes, t|T is terabytes, p|P is petabytes, e|E is exabytes. (This should not exist confused with the output control --units, where capital letters mean multiple of 1000.)
Surroundings VARIABLES
See lvm(eight) for information well-nigh environment variables used past lvm. For example, LVM_VG_NAME can generally be substituted for a required VG parameter.
Meet Also
lvm(8) lvm.conf(5) lvmconfig(viii) pvchange(8) pvck(viii) pvcreate(8) pvdisplay(8) pvmove(8) pvremove(eight) pvresize(viii) pvs(8) pvscan(8) vgcfgbackup(8) vgcfgrestore(eight) vgchange(eight) vgck(8) vgcreate(8) vgconvert(8) vgdisplay(8) vgexport(8) vgextend(8) vgimport(viii) vgimportclone(viii) vgmerge(8) vgmknodes(eight) vgreduce(eight) vgremove(8) vgrename(8) vgs(8) vgscan(8) vgsplit(eight) lvcreate(viii) lvchange(8) lvconvert(8) lvdisplay(eight) lvextend(viii) lvreduce(8) lvremove(eight) lvrename(8) lvresize(8) lvs(eight) lvscan(8) lvm-fullreport(8) lvm-lvpoll(8) lvm2-activation-generator(8) blkdeactivate(8) lvmdump(8) dmeventd(8) lvmetad(viii) lvmpolld(8) lvmlockd(8) lvmlockctl(eight) clvmd(8) cmirrord(eight) lvmdbusd(8) lvmsystemid(7) lvmreport(seven) lvmraid(7) lvmthin(7) lvmcache(7)
Source: http://manpages.ubuntu.com/manpages/bionic/man8/pvscan.8.html
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