7.2. 在失败的设备中显示信息。

You can use the -P argument of the lvs or vgs command to display information about a failed volume that would otherwise not appear in the output. This argument permits some operations even though the metadata is not completely consistent internally. For example, if one of the devices that made up the volume group vg failed, the vgs command might show the following output.

vgs -o +devices

# vgs -o +devices
  Volume group "vg" not found

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如果您为 vgs 指定了 -P 选项，那么该卷组虽仍然不可用，但您可能看到更多有关失败设备的信息。

vgs -P -o +devices

# vgs -P -o +devices
  Partial mode. Incomplete volume groups will be activated read-only.
  VG   #PV #LV #SN Attr   VSize VFree Devices
  vg     9   2   0 rz-pn- 2.11T 2.07T unknown device(0)
  vg     9   2   0 rz-pn- 2.11T 2.07T unknown device(5120),/dev/sda1(0)

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在这个示例中，失败的设备导致卷组中的线性和条状逻辑卷都失败。不带 -P 选项的 lvs 命令会显示以下输出结果。

lvs -a -o +devices

# lvs -a -o +devices
  Volume group "vg" not found

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使用 -P 选项显示失败的逻辑卷。

lvs -P -a -o +devices

# lvs -P -a -o +devices
  Partial mode. Incomplete volume groups will be activated read-only.
  LV     VG   Attr   LSize  Origin Snap%  Move Log Copy%  Devices
  linear vg   -wi-a- 20.00G                               unknown device(0)
  stripe vg   -wi-a- 20.00G                               unknown device(5120),/dev/sda1(0)

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下面的例子显示在镜像逻辑卷的一支出错时，带 -P 选项的 pvs 和 lvs 命令的输出结果。

 vgs -a -o +devices -P

#  vgs -a -o +devices -P
  Partial mode. Incomplete volume groups will be activated read-only.
  VG    #PV #LV #SN Attr   VSize VFree Devices
  corey   4   4   0 rz-pnc 1.58T 1.34T my_mirror_mimage_0(0),my_mirror_mimage_1(0)
  corey   4   4   0 rz-pnc 1.58T 1.34T /dev/sdd1(0)
  corey   4   4   0 rz-pnc 1.58T 1.34T unknown device(0)
  corey   4   4   0 rz-pnc 1.58T 1.34T /dev/sdb1(0)

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lvs -a -o +devices -P

# lvs -a -o +devices -P
  Partial mode. Incomplete volume groups will be activated read-only.
  LV                   VG    Attr   LSize   Origin Snap%  Move Log            Copy%  Devices
  my_mirror            corey mwi-a- 120.00G                    my_mirror_mlog   1.95 my_mirror_mimage_0(0),my_mirror_mimage_1(0)
  [my_mirror_mimage_0] corey iwi-ao 120.00G                                          unknown device(0)
  [my_mirror_mimage_1] corey iwi-ao 120.00G                                          /dev/sdb1(0)
  [my_mirror_mlog]     corey lwi-ao   4.00M                                          /dev/sdd1(0)

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7.2. 在失败的设备中显示信息。

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