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Linux LVM学习总结——放大LV容量

2015-09-01 16:31 453 查看

本篇介绍LVM管理中的命令lvresize，我们先创建一个卷组VGVolGroup02，它建立在磁盘/dev/sdc（大小为8G）上。创建逻辑卷LV时，我们故意只使用了一小部分。具体情况如下所示

[root@localhost~]#vgdisplay

---Volumegroup---

VGNameVolGroup02

SystemID

Formatlvm2

MetadataAreas1

MetadataSequenceNo1

VGAccessread/write

VGStatusresizable

MAXLV0

CurLV0

OpenLV0

MaxPV0

CurPV1

ActPV1

VGSize7.97GiB

PESize32.00MiB

TotalPE255

AllocPE/Size0/0

FreePE/Size255/7.97GiB

VGUUIDSETgjx-dobd-Uayt-AWgN-HKID-hsYe-tEotIS

[root@localhost~]#lvcreate-L7.97-nLogVol00VolGroup02

Roundingupsizetofullphysicalextent32.00MiB

Logicalvolume"LogVol00"created

[root@localhost~]#mkfs-text4/dev/VolGroup02/LogVol00

mke2fs1.41.12(17-May-2010)

Filesystemlabel=

OStype:Linux

Blocksize=1024(log=0)

Fragmentsize=1024(log=0)

Stride=0blocks,Stripewidth=0blocks

8192inodes,32768blocks

1638blocks(5.00%)reservedforthesuperuser

Firstdatablock=1

Maximumfilesystemblocks=33554432

4blockgroups

8192blockspergroup,8192fragmentspergroup

2048inodespergroup

Superblockbackupsstoredonblocks:

8193,24577

Writinginodetables:done

Creatingjournal(4096blocks):done

Writingsuperblocksandfilesystemaccountinginformation:done

Thisfilesystemwillbeautomaticallycheckedevery23mountsor

180days,whichevercomesfirst.Usetune2fs-cor-itooverride.

[root@localhost~]#cd/

[root@localhost/]#mkdir/u01

[root@localhost/]#mount/dev/VolGroup02/LogVol00/u01

[root@localhost/]#vi/etc/fstab

#/etc/fstab

#CreatedbyanacondaonMonAug1715:08:212015

#Accessiblefilesystems,byreference,aremaintainedunder'/dev/disk'

#Seemanpagesfstab(5),findfs(8),mount(8)and/orblkid(8)formoreinfo

UUID=3440ad55-6486-45ed-876f-e942b08013bf/ext4defaults11

UUID=d3abb655-db70-4c42-967d-57c421abfda0/bootext4defaults12

UUID=660624ff-335d-42ca-b779-f130a80d9da8/homeext4defaults12

UUID=6f534bf0-e486-4937-84ae-ed1221cf34f1swapswapdefaults00

/dev/VolGroup02/LogVol00/u01ext4defaults11

tmpfs/dev/shmtmpfsdefaults00

devpts/dev/ptsdevptsgid=5,mode=62000

sysfs/syssysfsdefaults00

proc/procprocdefaults00

此时，我们要放大文件系统/u01的大小，那么就需要使用到lvresize放大LV容量

[root@localhost~]#lvscan

ACTIVE'/dev/VolGroup02/LogVol00'[32.00MiB]inherit

[root@localhost~]#lvdisplay/dev/VolGroup02/LogVol00

---Logicalvolume---

LVPath/dev/VolGroup02/LogVol00

LVNameLogVol00

VGNameVolGroup02

LVUUIDOCHwx1-EL9P-6C5J-RNuz-2Xu5-4215-H3xt5s

LVWriteAccessread/write

LVCreationhost,timelocalhost.localdomain,2015-09-0110:50:10+0800

LVStatusavailable

#open1

LVSize32.00MiB

CurrentLE1

Segments1

Allocationinherit

Readaheadsectorsauto

-currentlysetto256

Blockdevice253:0

[root@localhost~]#lvresize-L+7.89G/dev/VolGroup02/LogVol00

Roundingsizetoboundarybetweenphysicalextents:7.91GiB

SizeoflogicalvolumeVolGroup02/LogVol00changedfrom32.00MiB(1extents)to7.94GiB(254extents).

LogicalvolumeLogVol00successfullyresized

[root@localhost~]#resize2fs-p/dev/VolGroup02/LogVol00

resize2fs1.41.12(17-May-2010)

Filesystemat/dev/VolGroup02/LogVol00ismountedon/u01;on-lineresizingrequired

olddesc_blocks=1,new_desc_blocks=32

Performinganon-lineresizeof/dev/VolGroup02/LogVol00to8323072(1k)blocks.

Thefilesystemon/dev/VolGroup02/LogVol00isnow8323072blockslong.

[root@localhost~]#df-h

FilesystemSizeUsedAvailUse%Mountedon

/dev/sda227G6.0G20G24%/

tmpfs5.9G05.9G0%/dev/shm

/dev/sda1477M32M420M8%/boot

/dev/sdb199G60M94G1%/home

/dev/mapper/VolGroup02-LogVol00

7.7G2.7M7.3G1%/u01

如果我们此时在虚拟机上将磁盘从8G扩展为10G，那么要如何利用扩展的磁盘空间呢？

[root@localhostu01]#fdisk-l

Disk/dev/sda:42.9GB,42949672960bytes

64heads,32sectors/track,40960cylinders

Units=cylindersof2048*512=1048576bytes

Sectorsize(logical/physical):512bytes/512bytes

I/Osize(minimum/optimal):512bytes/512bytes

Diskidentifier:0x000462cf

DeviceBootStartEndBlocksIdSystem

/dev/sda1*250151200083Linux

Partition1doesnotendoncylinderboundary.

/dev/sda2502286722884710483Linux

Partition2doesnotendoncylinderboundary.

/dev/sda328673409601258291282Linuxswap/Solaris

Partition3doesnotendoncylinderboundary.

Disk/dev/sdc:8589MB,8589934592bytes

64heads,32sectors/track,8192cylinders

Units=cylindersof2048*512=1048576bytes

Sectorsize(logical/physical):512bytes/512bytes

I/Osize(minimum/optimal):512bytes/512bytes

Diskidentifier:0x98c391fe

DeviceBootStartEndBlocksIdSystem

/dev/sdc118192838859283Linux

Disk/dev/sdb:107.4GB,107374182400bytes

255heads,63sectors/track,13054cylinders

Units=cylindersof16065*512=8225280bytes

Sectorsize(logical/physical):512bytes/512bytes

I/Osize(minimum/optimal):512bytes/512bytes

Diskidentifier:0x0002488e

DeviceBootStartEndBlocksIdSystem

/dev/sdb111305510485657683Linux

Disk/dev/mapper/VolGroup02-LogVol00:33MB,33554432bytes

255heads,63sectors/track,4cylinders

Units=cylindersof16065*512=8225280bytes

Sectorsize(logical/physical):512bytes/512bytes

I/Osize(minimum/optimal):512bytes/512bytes

Diskidentifier:0x00000000

重启过后才能看到/dev/sdc的空间变化情况。

新建分区


[code][root@localhost~]#fdisk/dev/sdc

WARNING:DOS-compatiblemodeisdeprecated.It'sstronglyrecommendedto

switchoffthemode(command'c')andchangedisplayunitsto

sectors(command'u').

Command(mforhelp):p

Disk/dev/sdc:10.7GB,10737418240bytes

64heads,32sectors/track,10240cylinders

Units=cylindersof2048*512=1048576bytes

Sectorsize(logical/physical):512bytes/512bytes

I/Osize(minimum/optimal):512bytes/512bytes

Diskidentifier:0x98c391fe

DeviceBootStartEndBlocksIdSystem

/dev/sdc118192838859283Linux

Command(mforhelp):n

Commandaction

eextended

pprimarypartition(1-4)

Partitionnumber(1-4):2

Firstcylinder(8193-10240,default8193):

Usingdefaultvalue8193

Lastcylinder,+cylindersor+size{K,M,G}(8193-10240,default10240):

Usingdefaultvalue10240

Command(mforhelp):p

Disk/dev/sdc:10.7GB,10737418240bytes

64heads,32sectors/track,10240cylinders

Units=cylindersof2048*512=1048576bytes

Sectorsize(logical/physical):512bytes/512bytes

I/Osize(minimum/optimal):512bytes/512bytes

Diskidentifier:0x98c391fe

DeviceBootStartEndBlocksIdSystem

/dev/sdc118192838859283Linux

/dev/sdc2819310240209715283Linux

Command(mforhelp):w

Thepartitiontablehasbeenaltered!

Callingioctl()tore-readpartitiontable.

WARNING:Re-readingthepartitiontablefailedwitherror16:Deviceorresourcebusy.

Thekernelstillusestheoldtable.Thenewtablewillbeusedat

thenextrebootorafteryourunpartprobe(8)orkpartx(8)

Syncingdisks.

新建物理卷PV

[root@localhost~]#pvcreate/dev/sdc2

Physicalvolume"/dev/sdc2"successfullycreated

放大VG容量

[root@localhost~]#vgextend/dev/mapper/VolGroup02/dev/sdc2

Volumegroup"VolGroup02"successfullyextended

放大LV容量

[root@localhost~]#pvscan

PV/dev/sdc1VGVolGroup02lvm2[7.97GiB/32.00MiBfree]

PV/dev/sdc2VGVolGroup02lvm2[1.97GiB/1.97GiBfree]

Total:2[9.94GiB]/inuse:2[9.94GiB]/innoVG:0[0]

[root@localhost~]#pvdisplay/dev/sdc2

---Physicalvolume---

PVName/dev/sdc2

VGNameVolGroup02

PVSize2.00GiB/notusable32.00MiB

Allocatableyes

PESize32.00MiB

TotalPE63

FreePE63

AllocatedPE0

PVUUIDqP1PGl-krr9-vCTY-vWgN-MsKL-rn1x-zAhmmc

[root@localhost~]#lvextend-L+1.97G/dev/VolGroup02/LogVol00

Roundingsizetoboundarybetweenphysicalextents:2.00GiB

SizeoflogicalvolumeVolGroup02/LogVol00changedfrom7.94GiB(254extents)to9.94GiB(318extents).

LogicalvolumeLogVol00successfullyresized

[root@localhost~]#resize2fs/dev/VolGroup02/LogVol00

resize2fs1.41.12(17-May-2010)

Filesystemat/dev/VolGroup02/LogVol00ismountedon/u01;on-lineresizingrequired

olddesc_blocks=32,new_desc_blocks=40

Performinganon-lineresizeof/dev/VolGroup02/LogVol00to10420224(1k)blocks.

Thefilesystemon/dev/VolGroup02/LogVol00isnow10420224blockslong.

[root@localhost~]#df-h

FilesystemSizeUsedAvailUse%Mountedon

/dev/sda227G6.0G20G24%/

tmpfs5.9G05.9G0%/dev/shm

/dev/sda1477M32M420M8%/boot

/dev/sdb199G60M94G1%/home

/dev/mapper/VolGroup02-LogVol00

9.7G2.5M9.2G1%/u01

[root@localhost~]#

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