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config: improve scan_lvs description

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David Teigland 2019-03-06 13:33:07 -06:00
parent 98b7a3a42d
commit 9b2b0fef9c
1 changed files with 11 additions and 1 deletions
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lib/config/config_settings.h
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@ -352,7 +352,17 @@ cfg(devices_sysfs_scan_CFG, "sysfs_scan", devices_CFG_SECTION, 0, CFG_TYPE_BOOL,
"present on the system. sysfs must be part of the kernel and mounted.)\n")
cfg(devices_scan_lvs_CFG, "scan_lvs", devices_CFG_SECTION, 0, CFG_TYPE_BOOL, DEFAULT_SCAN_LVS, vsn(2, 2, 182), NULL, 0, NULL,
"Scan LVM LVs for layered PVs.\n")
"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")
cfg(devices_multipath_component_detection_CFG, "multipath_component_detection", devices_CFG_SECTION, 0, CFG_TYPE_BOOL, DEFAULT_MULTIPATH_COMPONENT_DETECTION, vsn(2, 2, 89), NULL, 0, NULL,
"Ignore devices that are components of DM multipath devices.\n")