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502 lines
11 KiB
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502 lines
11 KiB
Plaintext
.TH PVSCAN 8 "LVM TOOLS #VERSION#" "Red Hat, Inc."
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.SH NAME
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pvscan - List all physical volumes
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.
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.SH SYNOPSIS
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\fBpvscan\fP \fIoption_args\fP
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.br
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[ \fIoption_args\fP ]
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.br
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[ \fIposition_args\fP ]
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.br
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.SH DESCRIPTION
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pvscan scans all supported LVM block devices in the system for PVs.
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\fBScanning with lvmetad\fP
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pvscan operates differently when used with the
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.BR lvmetad (8)
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daemon.
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Scanning disks is required to read LVM metadata and identify LVM PVs.
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Once read, lvmetad caches the metadata so that LVM commands can read it
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without repeatedly scanning disks. This is helpful because scanning disks
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is time consuming, and frequent scanning may interfere with the normal
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work of the system and disks.
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When lvmetad is not used, LVM commands revert to scanning disks to read
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metadata. Any LVM command that needs metadata will scan disks for it;
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running the pvscan command is not necessary for the sake of other LVM
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commands.
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When lvmetad is used, LVM commands avoid scanning disks by reading
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metadata from lvmetad. When new disks appear, they must be scanned so
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their metadata can be cached in lvmetad. This is done by the command
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pvscan --cache, which scans disks and passes the metadata to lvmetad.
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The pvscan --cache command is typically run automatically by system
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services when a new device appears. Users do not generally need to run
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this command if the system and lvmetad are running properly.
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Many scripts contain unnecessary pvscan (or vgscan) commands for
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historical reasons. To avoid disrupting the system with extraneous disk
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scanning, an ordinary pvscan (without --cache) will simply read metadata
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from lvmetad like other LVM commands. It does not do anything beyond
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displaying the current state of the cache.
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.IP \[bu] 2
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When given specific device name arguments, pvscan --cache will only
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read the named devices.
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.IP \[bu] 2
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LVM udev rules and systemd services are used to initiate automatic device
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scanning.
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.IP \[bu] 2
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To prevent devices from being scanned by pvscan --cache, add them
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to
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.BR lvm.conf (5)
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.B devices/global_filter.
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The devices/filter setting does not
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apply to system level scanning.
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For more information, see:
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.br
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.B lvmconfig --withcomments devices/global_filter
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.IP \[bu] 2
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If lvmetad is started or restarted after devices are visible, or
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if the global_filter has changed, then all devices must be rescanned
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for metadata with the command pvscan --cache.
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.IP \[bu] 2
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lvmetad does not cache older metadata formats, e.g. lvm1, and will
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be temporarily disabled if they are seen.
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.IP \[bu] 2
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To notify lvmetad about a device that is no longer present, the major and
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minor numbers must be given, not the path.
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.P
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\fBAutomatic activation\fP
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When event-driven system services detect a new LVM device, the first step
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is to automatically scan and cache the metadata from the device. This is
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done by pvscan --cache. A second step is to automatically activate LVs
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that are present on the new device. This auto-activation is done by the
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same pvscan --cache command when the option --activate ay is included.
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Auto-activation of VGs or LVs can be enabled/disabled using:
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.br
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.BR lvm.conf (5)
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.B activation/auto_activation_volume_list
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For more information, see:
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.br
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.B lvmconfig --withcomments activation/auto_activation_volume_list
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When this setting is undefined, all LVs are auto-activated (when lvm is
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fully integrated with the event-driven system services.)
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When a VG or LV is not auto-activated, traditional activation using
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vgchange or lvchange --activate is needed.
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.IP \[bu] 2
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pvscan auto-activation can be only done in combination with --cache.
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.IP \[bu] 2
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Auto-activation is designated by the "a" argument in --activate ay.
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This is meant to distinguish system generated commands from explicit user
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commands, although it can be used in any activation command. Whenever it
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is used, the auto_activation_volume_list is applied.
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.IP \[bu] 2
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Auto-activation is not yet supported for LVs that are part of partial or
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clustered volume groups.
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.SH USAGE
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Display PV information.
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.br
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.P
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\fBpvscan\fP
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.br
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.RS 4
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.ad l
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[ \fB-e\fP|\fB--exported\fP ]
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.ad b
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.br
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.ad l
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[ \fB-n\fP|\fB--novolumegroup\fP ]
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.ad b
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.br
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.ad l
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[ \fB-s\fP|\fB--short\fP ]
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.ad b
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.br
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.ad l
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[ \fB-u\fP|\fB--uuid\fP ]
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.ad b
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.br
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[ COMMON_OPTIONS ]
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.RE
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.br
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Autoactivate a VG when all PVs are online.
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.br
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.P
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\fBpvscan\fP \fB--cache\fP
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.br
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.RS 4
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.ad l
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[ \fB-b\fP|\fB--background\fP ]
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.ad b
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.br
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.ad l
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[ \fB-a\fP|\fB--activate\fP \fBay\fP ]
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.ad b
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.br
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.ad l
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[ \fB-j\fP|\fB--major\fP \fINumber\fP ]
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.ad b
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.br
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.ad l
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[ \fB--minor\fP \fINumber\fP ]
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.ad b
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.br
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[ COMMON_OPTIONS ]
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.RE
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.br
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.RS 4
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[ \fIString\fP|\fIPV\fP ... ]
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.RE
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Common options for command:
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.
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.RS 4
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.ad l
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[ \fB--ignorelockingfailure\fP ]
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.ad b
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.br
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.ad l
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[ \fB--reportformat\fP \fBbasic\fP|\fBjson\fP ]
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.ad b
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.RE
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Common options for lvm:
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.
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.RS 4
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.ad l
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[ \fB-d\fP|\fB--debug\fP ]
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.ad b
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.br
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.ad l
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[ \fB-h\fP|\fB--help\fP ]
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.ad b
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.br
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.ad l
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[ \fB-q\fP|\fB--quiet\fP ]
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.ad b
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.br
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.ad l
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[ \fB-t\fP|\fB--test\fP ]
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.ad b
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.br
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.ad l
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[ \fB-v\fP|\fB--verbose\fP ]
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.ad b
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.br
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.ad l
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[ \fB-y\fP|\fB--yes\fP ]
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.ad b
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.br
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.ad l
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[ \fB--commandprofile\fP \fIString\fP ]
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.ad b
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.br
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.ad l
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[ \fB--config\fP \fIString\fP ]
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.ad b
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.br
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.ad l
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[ \fB--driverloaded\fP \fBy\fP|\fBn\fP ]
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.ad b
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.br
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.ad l
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[ \fB--lockopt\fP \fIString\fP ]
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.ad b
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.br
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.ad l
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[ \fB--longhelp\fP ]
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.ad b
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.br
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.ad l
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[ \fB--nolocking\fP ]
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.ad b
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.br
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.ad l
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[ \fB--profile\fP \fIString\fP ]
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.ad b
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.br
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.ad l
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[ \fB--version\fP ]
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.ad b
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.RE
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.SH OPTIONS
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.HP
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.ad l
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\fB-a\fP|\fB--activate\fP \fBy\fP|\fBn\fP|\fBay\fP
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.br
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Auto-activate LVs in a VG when the PVs scanned have completed the VG.
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(Only \fBay\fP is applicable.)
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.ad b
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.HP
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.ad l
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\fB-b\fP|\fB--background\fP.ad b
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.HP
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.ad l
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\fB--cache\fP
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.br
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Scan one or more devices and record that they are online.
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.ad b
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.HP
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.ad l
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\fB--commandprofile\fP \fIString\fP
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.br
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The command profile to use for command configuration.
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See \fBlvm.conf\fP(5) for more information about profiles.
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.ad b
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.HP
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.ad l
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\fB--config\fP \fIString\fP
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.br
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Config settings for the command. These override lvm.conf settings.
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The String arg uses the same format as lvm.conf,
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or may use section/field syntax.
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See \fBlvm.conf\fP(5) for more information about config.
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.ad b
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.HP
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.ad l
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\fB-d\fP|\fB--debug\fP ...
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.br
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Set debug level. Repeat from 1 to 6 times to increase the detail of
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messages sent to the log file and/or syslog (if configured).
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.ad b
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.HP
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.ad l
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\fB--driverloaded\fP \fBy\fP|\fBn\fP
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.br
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If set to no, the command will not attempt to use device-mapper.
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For testing and debugging.
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.ad b
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.HP
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.ad l
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\fB-e\fP|\fB--exported\fP
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.br
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Only show PVs belonging to exported VGs.
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.ad b
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.HP
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.ad l
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\fB-h\fP|\fB--help\fP
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.br
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Display help text.
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.ad b
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.HP
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.ad l
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\fB--ignorelockingfailure\fP
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.br
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Allows a command to continue with read-only metadata
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operations after locking failures.
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.ad b
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.HP
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.ad l
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\fB--lockopt\fP \fIString\fP
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.br
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Used to pass options for special cases to lvmlockd.
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See \fBlvmlockd\fP(8) for more information.
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.ad b
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.HP
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.ad l
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\fB--longhelp\fP
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.br
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Display long help text.
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.ad b
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.HP
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.ad l
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\fB-j\fP|\fB--major\fP \fINumber\fP
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.br
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The major number of a device.
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.ad b
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.HP
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.ad l
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\fB--minor\fP \fINumber\fP
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.br
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The minor number of a device.
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.ad b
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.HP
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.ad l
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\fB--nolocking\fP
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.br
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Disable locking.
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.ad b
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.HP
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.ad l
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\fB-n\fP|\fB--novolumegroup\fP
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.br
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Only show PVs not belonging to any VG.
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.ad b
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.HP
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.ad l
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\fB--profile\fP \fIString\fP
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.br
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An alias for --commandprofile or --metadataprofile, depending
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on the command.
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.ad b
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.HP
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.ad l
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\fB-q\fP|\fB--quiet\fP ...
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.br
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Suppress output and log messages. Overrides --debug and --verbose.
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Repeat once to also suppress any prompts with answer 'no'.
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.ad b
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.HP
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.ad l
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\fB--reportformat\fP \fBbasic\fP|\fBjson\fP
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.br
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Overrides current output format for reports which is defined globally by
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the report/output_format setting in lvm.conf.
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\fBbasic\fP is the original format with columns and rows.
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If there is more than one report per command, each report is prefixed
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with the report name for identification. \fBjson\fP produces report
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output in JSON format. See \fBlvmreport\fP(7) for more information.
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.ad b
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.HP
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.ad l
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\fB-s\fP|\fB--short\fP
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.br
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Short listing format.
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.ad b
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.HP
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.ad l
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\fB-t\fP|\fB--test\fP
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.br
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Run in test mode. Commands will not update metadata.
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This is implemented by disabling all metadata writing but nevertheless
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returning success to the calling function. This may lead to unusual
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error messages in multi-stage operations if a tool relies on reading
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back metadata it believes has changed but hasn't.
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.ad b
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.HP
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.ad l
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\fB-u\fP|\fB--uuid\fP
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.br
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Show UUIDs in addition to device names.
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.ad b
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.HP
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.ad l
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\fB-v\fP|\fB--verbose\fP ...
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.br
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Set verbose level. Repeat from 1 to 4 times to increase the detail
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of messages sent to stdout and stderr.
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.ad b
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.HP
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.ad l
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\fB--version\fP
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.br
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Display version information.
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.ad b
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.HP
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.ad l
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\fB-y\fP|\fB--yes\fP
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.br
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Do not prompt for confirmation interactively but always assume the
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answer yes. Use with extreme caution.
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(For automatic no, see -qq.)
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.ad b
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.SH VARIABLES
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.HP
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\fIPV\fP
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.br
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Physical Volume name, a device path under /dev.
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For commands managing physical extents, a PV positional arg
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generally accepts a suffix indicating a range (or multiple ranges)
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of physical extents (PEs). When the first PE is omitted, it defaults
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to the start of the device, and when the last PE is omitted it defaults to end.
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Start and end range (inclusive): \fIPV\fP[\fB:\fP\fIPE\fP\fB-\fP\fIPE\fP]...
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Start and length range (counting from 0): \fIPV\fP[\fB:\fP\fIPE\fP\fB+\fP\fIPE\fP]...
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.HP
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\fIString\fP
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.br
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See the option description for information about the string content.
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.HP
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\fISize\fP[UNIT]
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.br
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Size is an input number that accepts an optional unit.
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Input units are always treated as base two values, regardless of
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capitalization, e.g. 'k' and 'K' both refer to 1024.
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The default input unit is specified by letter, followed by |UNIT.
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UNIT represents other possible input units: \fBbBsSkKmMgGtTpPeE\fP.
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b|B is bytes, s|S is sectors of 512 bytes, k|K is kilobytes,
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m|M is megabytes, g|G is gigabytes, t|T is terabytes,
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p|P is petabytes, e|E is exabytes.
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(This should not be confused with the output control --units, where
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capital letters mean multiple of 1000.)
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.SH ENVIRONMENT VARIABLES
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See \fBlvm\fP(8) for information about environment variables used by lvm.
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For example, LVM_VG_NAME can generally be substituted for a required VG parameter.
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.SH SEE ALSO
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.BR lvm (8)
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.BR lvm.conf (5)
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.BR lvmconfig (8)
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.BR pvchange (8)
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.BR pvck (8)
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.BR pvcreate (8)
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.BR pvdisplay (8)
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.BR pvmove (8)
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.BR pvremove (8)
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.BR pvresize (8)
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.BR pvs (8)
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.BR pvscan (8)
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.BR vgcfgbackup (8)
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.BR vgcfgrestore (8)
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.BR vgchange (8)
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.BR vgck (8)
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.BR vgcreate (8)
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.BR vgconvert (8)
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.BR vgdisplay (8)
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.BR vgexport (8)
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.BR vgextend (8)
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.BR vgimport (8)
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.BR vgimportclone (8)
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.BR vgmerge (8)
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.BR vgmknodes (8)
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.BR vgreduce (8)
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.BR vgremove (8)
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.BR vgrename (8)
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.BR vgs (8)
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.BR vgscan (8)
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.BR vgsplit (8)
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.BR lvcreate (8)
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.BR lvchange (8)
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.BR lvconvert (8)
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.BR lvdisplay (8)
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.BR lvextend (8)
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.BR lvreduce (8)
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.BR lvremove (8)
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.BR lvrename (8)
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.BR lvresize (8)
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.BR lvs (8)
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.BR lvscan (8)
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.BR lvm-fullreport (8)
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.BR lvm-lvpoll (8)
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.BR lvm2-activation-generator (8)
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.BR blkdeactivate (8)
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.BR lvmdump (8)
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.BR dmeventd (8)
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.BR lvmetad (8)
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.BR lvmpolld (8)
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.BR lvmlockd (8)
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.BR lvmlockctl (8)
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.BR clvmd (8)
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.BR cmirrord (8)
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.BR lvmdbusd (8)
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.BR lvmsystemid (7)
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.BR lvmreport (7)
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.BR lvmraid (7)
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.BR lvmthin (7)
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.BR lvmcache (7)
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