Linux LVM学习总结——删除物理卷

本篇介绍LVM管理中的命令vgreduce,pvremove。其实前面几篇中以及有所涉及。vgreduce：通过删除LVM卷组中的物理卷来减少卷组容量。注意：不能删除LVM卷组中剩余的最后一个物理卷pvremove:用于删除一个存在的物理卷。使用pvremove指令删除物理卷时，它将LVM分区上的物理卷信息删除，使其不再被视为一个物理卷。在删除物理卷PV之前，必须将服务器的分区信息、卷组信息、物理卷信息、逻辑卷信息都掌握清楚，避免出现失误或误操作。

[root@localhost~]#fdisk-l

Disk/dev/sda:128.8GB,128849018880bytes

255heads,63sectors/track,15665cylinders

Units=cylindersof16065*512=8225280bytes

DeviceBootStartEndBlocksIdSystem

/dev/sda1*11310439183Linux

/dev/sda21410443837789758eLinuxLVM

/dev/sda310444156654194571583Linux

[root@localhost~]#vgscan

Readingallphysicalvolumes.Thismaytakeawhile...

Foundvolumegroup"VolGroup00"usingmetadatatypelvm2

[root@localhost~]#pvscan

PV/dev/sda2VGVolGroup00lvm2[79.88GB/0free]

PV/dev/sda3VGVolGroup00lvm2[40.00GB/40.00GBfree]

Total:2[119.88GB]/inuse:2[119.88GB]/innoVG:0[0]

[root@localhost~]#pvdisplay

---Physicalvolume---

PVName/dev/sda2

VGNameVolGroup00

PVSize79.90GB/notusable23.41MB

Allocatableyes(butfull)

PESize(KByte)32768

TotalPE2556

FreePE0

AllocatedPE2556

PVUUIDYGtB2J-ZKJr-mV62-NluQ-2DGy-vuUT-cCc1lo

---Physicalvolume---

PVName/dev/sda3

VGNameVolGroup00

PVSize40.00GB/notusable2.61MB

Allocatableyes

PESize(KByte)32768

TotalPE1280

FreePE1280

AllocatedPE0

PVUUIDwsnv13-7j1H-SH8q-hl6k-HpNc-x4WU-gM7LzW

[root@localhost~]#lvscan

ACTIVE'/dev/VolGroup00/LogVol00'[77.91GB]inherit

ACTIVE'/dev/VolGroup00/LogVol01'[1.97GB]inherit

[root@localhost~]#lvs

LVVGAttrLSizeOriginSnap%MoveLogCopy%Convert

LogVol00VolGroup00-wi-ao77.91G

LogVol01VolGroup00-wi-ao1.97G

vgreduce参数：


-a：如果命令行中没有指定要删除的物理卷，则删除所有的空物理卷；
--removemissing：删除卷组中丢失的物理卷，使卷组恢复正常状态。

[root@localhost~]#vgreduceVolGroup00/dev/sda3

Removed"/dev/sda3"fromvolumegroup"VolGroup00"

[root@localhost~]#

[root@localhost~]#pvscan

PV/dev/sda2VGVolGroup00lvm2[79.88GB/0free]

PV/dev/sda3lvm2[40.00GB]

Total:2[119.88GB]/inuse:1[79.88GB]/innoVG:1[40.00GB]

[root@localhost~]#pvs

PVVGFmtAttrPSizePFree

/dev/sda2VolGroup00lvm2a-79.88G0

/dev/sda3lvm2a-40.00G40.00G

[root@localhost~]#pvremove/dev/sda3

Labelsonphysicalvolume"/dev/sda3"successfullywiped

[root@localhost~]#pvscan

PV/dev/sda2VGVolGroup00lvm2[79.88GB/0free]

Total:1[79.88GB]/inuse:1[79.88GB]/innoVG:0[0]