6.4. 修​​​​​​​复​​​​​​​物​​​​​​​理​​​​​​​卷​​​​​​​元​​​​​​​数​​​​​​​据​​​​​​​

如​​​​​​​果​​​​​​​不​​​​​​​小​​​​​​​心​​​​​​​覆​​​​​​​盖​​​​​​​或​​​​​​​者​​​​​​​破​​​​​​​坏​​​​​​​了​​​​​​​卷​​​​​​​组​​​​​​​物​​​​​​​理​​​​​​​卷​​​​​​​元​​​​​​​数​​​​​​​据​​​​​​​区​​​​​​​域​​​​​​​，您​​​​​​​会​​​​​​​看​​​​​​​到​​​​​​​出​​​​​​​错​​​​​​​信​​​​​​​息​​​​​​​显​​​​​​​示​​​​​​​元​​​​​​​数​​​​​​​据​​​​​​​区​​​​​​​域​​​​​​​不​​​​​​​正​​​​​​​确​​​​​​​，或​​​​​​​者​​​​​​​系​​​​​​​统​​​​​​​无​​​​​​​法​​​​​​​使​​​​​​​用​​​​​​​特​​​​​​​定​​​​​​​的​​​​​​​ UUID 找​​​​​​​到​​​​​​​物​​​​​​​理​​​​​​​卷​​​​​​​。​​​​​​​您​​​​​​​可​​​​​​​能​​​​​​​需​​​​​​​要​​​​​​​通​​​​​​​过​​​​​​​在​​​​​​​物​​​​​​​理​​​​​​​卷​​​​​​​的​​​​​​​元​​​​​​​数​​​​​​​据​​​​​​​区​​​​​​​域​​​​​​​写​​​​​​​入​​​​​​​新​​​​​​​的​​​​​​​元​​​​​​​数​​​​​​​据​​​​​​​来​​​​​​​修​​​​​​​复​​​​​​​物​​​​​​​理​​​​​​​卷​​​​​​​数​​​​​​​据​​​​​​​，指​​​​​​​定​​​​​​​相​​​​​​​同​​​​​​​的​​​​​​​ UUID 作​​​​​​​为​​​​​​​丢​​​​​​​失​​​​​​​的​​​​​​​元​​​​​​​数​​​​​​​据​​​​​​​。​​​​​​​

下​​​​​​​面​​​​​​​的​​​​​​​例​​​​​​​子​​​​​​​显​​​​​​​示​​​​​​​排​​​​​​​序​​​​​​​的​​​​​​​输​​​​​​​出​​​​​​​解​​​​​​​个​​​​​​​，您​​​​​​​可​​​​​​​以​​​​​​​看​​​​​​​到​​​​​​​您​​​​​​​的​​​​​​​元​​​​​​​数​​​​​​​据​​​​​​​是​​​​​​​丢​​​​​​​了​​​​​​​还​​​​​​​是​​​​​​​被​​​​​​​破​​​​​​​坏​​​​​​​了​​​​​​​。​​​​​​​

[root@link-07 backup]# lvs -a -o +devices
  Couldn't find device with uuid 'FmGRh3-zhok-iVI8-7qTD-S5BI-MAEN-NYM5Sk'.
  Couldn't find all physical volumes for volume group VG.
  Couldn't find device with uuid 'FmGRh3-zhok-iVI8-7qTD-S5BI-MAEN-NYM5Sk'.
  Couldn't find all physical volumes for volume group VG.
  ...

通​​​​​​​过​​​​​​​查​​​​​​​看​​​​​​​ /etc/lvm/archive 目​​​​​​​录​​​​​​​，您​​​​​​​可​​​​​​​能​​​​​​​可​​​​​​​以​​​​​​​找​​​​​​​到​​​​​​​被​​​​​​​覆​​​​​​​盖​​​​​​​的​​​​​​​物​​​​​​​理​​​​​​​卷​​​​​​​ UUID。​​​​​​​在​​​​​​​文​​​​​​​件​​​​​​​ VolumeGroupName_xxxx.vg 中​​​​​​​查​​​​​​​找​​​​​​​该​​​​​​​卷​​​​​​​组​​​​​​​最​​​​​​​后​​​​​​​的​​​​​​​有​​​​​​​效​​​​​​​归​​​​​​​档​​​​​​​ LVM 元​​​​​​​数​​​​​​​据​​​​​​​。​​​​​​​

另​​​​​​​外​​​​​​​，您​​​​​​​可​​​​​​​以​​​​​​​找​​​​​​​到​​​​​​​失​​​​​​​活​​​​​​​的​​​​​​​卷​​​​​​​并​​​​​​​设​​​​​​​定​​​​​​​ partial （-P）选​​​​​​​项​​​​​​​，这​​​​​​​样​​​​​​​您​​​​​​​就​​​​​​​可​​​​​​​以​​​​​​​找​​​​​​​到​​​​​​​丢​​​​​​​失​​​​​​​的​​​​​​​被​​​​​​​破​​​​​​​坏​​​​​​​的​​​​​​​物​​​​​​​理​​​​​​​卷​​​​​​​的​​​​​​​ UUID。​​​​​​​

[root@link-07 backup]# vgchange -an --partial
  Partial mode. Incomplete volume groups will be activated read-only.
  Couldn't find device with uuid 'FmGRh3-zhok-iVI8-7qTD-S5BI-MAEN-NYM5Sk'.
  Couldn't find device with uuid 'FmGRh3-zhok-iVI8-7qTD-S5BI-MAEN-NYM5Sk'.
  ...

使​​​​​​​用​​​​​​​ pvcreate 的​​​​​​​ --uuid 和​​​​​​​ --restorefile 选​​​​​​​项​​​​​​​恢​​​​​​​复​​​​​​​物​​​​​​​理​​​​​​​卷​​​​​​​。​​​​​​​下​​​​​​​面​​​​​​​的​​​​​​​例​​​​​​​子​​​​​​​使​​​​​​​用​​​​​​​上​​​​​​​述​​​​​​​ UUID FmGRh3-zhok-iVI8-7qTD-S5BI-MAEN-NYM5Sk 将​​​​​​​ /dev/sdh1 设​​​​​​​备​​​​​​​标​​​​​​​记​​​​​​​为​​​​​​​物​​​​​​​理​​​​​​​卷​​​​​​​。​​​​​​​这​​​​​​​个​​​​​​​命​​​​​​​令​​​​​​​使​​​​​​​用​​​​​​​ VG_00050.vg 中​​​​​​​的​​​​​​​元​​​​​​​数​​​​​​​据​​​​​​​信​​​​​​​息​​​​​​​，即​​​​​​​卷​​​​​​​组​​​​​​​ 最​​​​​​​新​​​​​​​的​​​​​​​归​​​​​​​档​​​​​​​元​​​​​​​数​​​​​​​据​​​​​​​恢​​​​​​​复​​​​​​​了​​​​​​​物​​​​​​​理​​​​​​​卷​​​​​​​标​​​​​​​签​​​​​​​。​​​​​​​restorefile 参​​​​​​​数​​​​​​​让​​​​​​​ pvcreate 生​​​​​​​成​​​​​​​一​​​​​​​个​​​​​​​与​​​​​​​卷​​​​​​​组​​​​​​​中​​​​​​​久​​​​​​​的​​​​​​​物​​​​​​​理​​​​​​​卷​​​​​​​兼​​​​​​​容​​​​​​​的​​​​​​​新​​​​​​​物​​​​​​​理​​​​​​​卷​​​​​​​，确​​​​​​​保​​​​​​​新​​​​​​​的​​​​​​​元​​​​​​​数​​​​​​​据​​​​​​​不​​​​​​​会​​​​​​​被​​​​​​​放​​​​​​​在​​​​​​​久​​​​​​​的​​​​​​​物​​​​​​​理​​​​​​​卷​​​​​​​所​​​​​​​做​​​​​​​的​​​​​​​数​​​​​​​据​​​​​​​区​​​​​​​域​​​​​​​（这​​​​​​​有​​​​​​​可​​​​​​​能​​​​​​​发​​​​​​​生​​​​​​​。​​​​​​​例​​​​​​​如​​​​​​​：如​​​​​​​果​​​​​​​原​​​​​​​来​​​​​​​的​​​​​​​ pvcreate 命​​​​​​​令​​​​​​​使​​​​​​​用​​​​​​​了​​​​​​​控​​​​​​​制​​​​​​​元​​​​​​​数​​​​​​​据​​​​​​​放​​​​​​​置​​​​​​​位​​​​​​​置​​​​​​​的​​​​​​​参​​​​​​​数​​​​​​​，或​​​​​​​者​​​​​​​使​​​​​​​用​​​​​​​了​​​​​​​应​​​​​​​用​​​​​​​不​​​​​​​同​​​​​​​默​​​​​​​认​​​​​​​选​​​​​​​项​​​​​​​的​​​​​​​软​​​​​​​件​​​​​​​版​​​​​​​本​​​​​​​创​​​​​​​建​​​​​​​物​​​​​​​理​​​​​​​卷​​​​​​​时​​​​​​​，就​​​​​​​会​​​​​​​发​​​​​​​生​​​​​​​这​​​​​​​种​​​​​​​情​​​​​​​况​​​​​​​）。​​​​​​​pvcreate 命​​​​​​​令​​​​​​​仅​​​​​​​覆​​​​​​​盖​​​​​​​ LVM 元​​​​​​​数​​​​​​​据​​​​​​​区​​​​​​​域​​​​​​​，不​​​​​​​会​​​​​​​影​​​​​​​响​​​​​​​现​​​​​​​有​​​​​​​的​​​​​​​数​​​​​​​据​​​​​​​区​​​​​​​域​​​​​​​。​​​​​​​

[root@link-07 backup]# pvcreate --uuid "FmGRh3-zhok-iVI8-7qTD-S5BI-MAEN-NYM5Sk" --restorefile /etc/lvm/archive/VG_00050.vg /dev/sdh1
  Physical volume "/dev/sdh1" successfully created

You can then use the vgcfgrestore command to restore the volume group's metadata.

[root@link-07 backup]# vgcfgrestore VG
  Restored volume group VG

现​​​​​​​在​​​​​​​您​​​​​​​可​​​​​​​以​​​​​​​显​​​​​​​示​​​​​​​逻​​​​​​​辑​​​​​​​卷​​​​​​​。​​​​​​​

[root@link-07 backup]# lvs -a -o +devices
  LV     VG   Attr   LSize   Origin Snap%  Move Log Copy%  Devices
  stripe VG   -wi--- 300.00G                               /dev/sdh1 (0),/dev/sda1(0)
  stripe VG   -wi--- 300.00G                               /dev/sdh1 (34728),/dev/sdb1(0)

下​​​​​​​面​​​​​​​的​​​​​​​命​​​​​​​令​​​​​​​激​​​​​​​活​​​​​​​卷​​​​​​​并​​​​​​​显​​​​​​​示​​​​​​​激​​​​​​​活​​​​​​​的​​​​​​​卷​​​​​​​。​​​​​​​

[root@link-07 backup]# lvchange -ay /dev/VG/stripe
[root@link-07 backup]# lvs -a -o +devices
  LV     VG   Attr   LSize   Origin Snap%  Move Log Copy%  Devices
  stripe VG   -wi-a- 300.00G                               /dev/sdh1 (0),/dev/sda1(0)
  stripe VG   -wi-a- 300.00G                               /dev/sdh1 (34728),/dev/sdb1(0)

如​​​​​​​果​​​​​​​磁​​​​​​​盘​​​​​​​中​​​​​​​的​​​​​​​ LVM 元​​​​​​​数​​​​​​​据​​​​​​​使​​​​​​​用​​​​​​​至​​​​​​​少​​​​​​​覆​​​​​​​盖​​​​​​​了​​​​​​​它​​​​​​​的​​​​​​​数​​​​​​​据​​​​​​​的​​​​​​​空​​​​​​​间​​​​​​​大​​​​​​​小​​​​​​​，这​​​​​​​个​​​​​​​命​​​​​​​令​​​​​​​可​​​​​​​以​​​​​​​恢​​​​​​​复​​​​​​​物​​​​​​​理​​​​​​​卷​​​​​​​。​​​​​​​如​​​​​​​果​​​​​​​覆​​​​​​​盖​​​​​​​元​​​​​​​数​​​​​​​据​​​​​​​的​​​​​​​数​​​​​​​据​​​​​​​超​​​​​​​过​​​​​​​了​​​​​​​元​​​​​​​数​​​​​​​据​​​​​​​区​​​​​​​域​​​​​​​，那​​​​​​​么​​​​​​​就​​​​​​​有​​​​​​​可​​​​​​​能​​​​​​​损​​​​​​​害​​​​​​​到​​​​​​​卷​​​​​​​中​​​​​​​的​​​​​​​数​​​​​​​据​​​​​​​。​​​​​​​您​​​​​​​可​​​​​​​能​​​​​​​可​​​​​​​以​​​​​​​使​​​​​​​用​​​​​​​ fsck 命​​​​​​​令​​​​​​​修​​​​​​​复​​​​​​​那​​​​​​​些​​​​​​​数​​​​​​​据​​​​​​​。​​​​​​​