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60 lines
1.8 KiB
Plaintext
60 lines
1.8 KiB
Plaintext
When called without the --cache option, pvscan lists PVs on the system,
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like
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.BR pvs (8)
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or
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.BR pvdisplay (8).
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.P
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When the --cache and -aay options are used, pvscan records which PVs are
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available on the system, and activates LVs in completed VGs. A VG is
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complete when pvscan sees that the final PV in the VG has appeared. This
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is used by event-based system startup (systemd, udev) to activate LVs.
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.P
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The four main variations of this are:
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.P
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.B pvscan --cache
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.I device
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.P
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If device is present, lvm adds a record that the PV on device is online.
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If device is not present, lvm removes the online record for the PV.
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In most cases, the pvscan will only read the named devices.
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.P
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.B pvscan --cache -aay
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.IR device ...
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.P
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This begins by performing the same steps as above. Afterward, if the VG
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for the specified PV is complete, then pvscan will activate LVs in the VG
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(the same as vgchange -aay vgname would do.)
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.P
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.B pvscan --cache
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.P
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This first clears all existing PV online records, then scans all devices
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on the system, adding PV online records for any PVs that are found.
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.P
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.B pvscan --cache -aay
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.P
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This begins by performing the same steps as pvscan --cache. Afterward, it
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activates LVs in any complete VGs.
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.P
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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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For more information, see:
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.br
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.B lvmconfig --withcomments devices/global_filter
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.P
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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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.P
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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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.P
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To disable auto-activation, explicitly set this list to an empty list,
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i.e. auto_activation_volume_list = [ ].
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.P
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When this setting is undefined (e.g. commented), then all LVs are
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auto-activated.
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