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lvm.conf: update scan_lvs description

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to better reflect the devices file existence, and
to mention layered autoactivation in lvm udev rules.
This commit is contained in:
David Teigland 2024-02-21 11:08:02 -06:00
parent e53703b88a
commit d1aacae0f7
1 changed files with 6 additions and 11 deletions
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17
lib/config/config_settings.h
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@ -394,17 +394,12 @@ cfg(devices_sysfs_scan_CFG, "sysfs_scan", devices_CFG_SECTION, CFG_DEFAULT_COMME
"present on the system. sysfs must be part of the kernel and mounted.)\n")
cfg(devices_scan_lvs_CFG, "scan_lvs", devices_CFG_SECTION, CFG_DEFAULT_COMMENTED, CFG_TYPE_BOOL, DEFAULT_SCAN_LVS, vsn(2, 2, 182), NULL, 0, NULL,
"Scan LVM LVs for layered PVs, allowing LVs to be used as PVs.\n"
"When 1, LVM will detect PVs layered on LVs, and caution must be\n"
"taken to avoid a host accessing a layered VG that may not belong\n"
"to it, e.g. from a guest image. This generally requires excluding\n"
"the LVs with device filters. Also, when this setting is enabled,\n"
"every LVM command will scan every active LV on the system (unless\n"
"filtered), which can cause performance problems on systems with\n"
"many active LVs. When this setting is 0, LVM will not detect or\n"
"use PVs that exist on LVs, and will not allow a PV to be created on\n"
"an LV. The LVs are ignored using a built in device filter that\n"
"identifies and excludes LVs.\n")
"Allow LVM LVs to be used as PVs. When enabled, LVM commands will\n"
"scan active LVs to look for other PVs. Caution is required to\n"
"avoid using PVs that belong to guest images stored on LVs.\n"
"When enabled, the LVs scanned should be restricted using the\n"
"devices file or the filter. This option does not enable autoactivation\n"
"of layered VGs, which requires editing LVM udev rules (see LVM_PVSCAN_ON_LVS.)\n")
cfg(devices_multipath_component_detection_CFG, "multipath_component_detection", devices_CFG_SECTION, CFG_DEFAULT_COMMENTED, CFG_TYPE_BOOL, DEFAULT_MULTIPATH_COMPONENT_DETECTION, vsn(2, 2, 89), NULL, 0, NULL,
"Ignore devices that are components of DM multipath devices.\n")