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The LVM devices file lists devices that lvm can use. The default file is /etc/lvm/devices/system.devices, and the lvmdevices(8) command is used to add or remove device entries. If the file does not exist, or if lvm.conf includes use_devicesfile=0, then lvm will not use a devices file. The command option --devicesfile <filename> allows lvm to be used with a different set of devices. This allows different applications to use lvm on different sets of devices, e.g. system devices do not need to be exposed to an application using lvm on its own devices, and application devices do not need to be exposed to the system devices. Setting --devicesfile "" causes lvm to not use a devices file. An existing but empty devices file will cause lvm to see no devices. When the devices file is used, the regex filter is not used, and the filter settings in lvm.conf or the command line are ignored. LVM records devices in the devices file using hardware-specific IDs, such as the WWID, and attempts to use subsystem-specific IDs for virtual device types (which should ideally be as unique and stable a hardware-based ID.) These IDs are also stored in the VG metadata. When neither kind of ID is available, lvm falls back use the unstable device name as the device ID. When devnames are used, lvm needs to take extra steps to find devices if their devname changes, e.g. after reboot. When proper device IDs are used, an lvm command will not look at devices outside the devices file, but when devnames must be used as a fallback, lvm will scan devices outside the devices file to locate PVs on renamed devices. A config setting search_for_devnames can be used to control the scanning for renamed devname entries. Related to the devices file, the new command option --devices <devnames> allows a specific list of devices to be exposed to the lvm command, overriding the devices file. The listed devices act as a sort of devices file in terms of limiting which devices lvm will use. |
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| lvmdbusd | ||
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| Makefile.in | ||