《LINUX實戰：使用LVM拓展Linux邏輯卷大小》要點：
本文介紹了LINUX實戰：使用LVM拓展Linux邏輯卷大小，希望對您有用。如果有疑問，可以聯系我們。

操作步調簡述：
1.查看磁盤信息

2.給硬盤/dev/sdc添加分區/dev/sdc1

2.1.fdisk /dev/sdc

m 查看贊助

n 添加新分區

t 改動分區類型為：8e? Linux LVM

p 查看分區

w 寫入分區表并退出

q 不保留分區表并退出

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3.擴展邏輯卷/dev/mapper/vg_RedHat-lv_root的年夜小

3.1進入LVM治理器

3.2將物理卷添加到現有卷組(也可直接將分區添加到現有卷組)

3.3查看所有邏輯卷

3.4擴展邏輯卷年夜小

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實際操作進程：

[root@TEST ~]# df -hl

Filesystem? ? ? ? ? ? ? ? Size? Used Avail Use% Mounted on

/dev/mapper/vg_redhat-lv_root? 45G? 36G? 6.7G? 85% /

tmpfs? ? ? ? ? ? ? ? ? 7.8G? 3.8G? 4.1G? 48% /dev/shm

/dev/sda1? ? ? ? ? ? 485M? 39M? 421M? 9% /boot

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[root@TEST ~]# fdisk -l

Disk /dev/sda: 53.7 GB, 53687091200 bytes

64 heads, 32 sectors/track, 51200 cylinders

Units = cylinders of 2048 * 512 = 1048576 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x000af440

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? Device Boot? ? ? Start? ? ? ? End? ? ? Blocks? Id? System
/dev/sda1? *? ? ? ? ? 2? ? ? ? 501? ? ? 512000? 83? Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2? ? ? ? ? ? 502? ? ? 51200? ? 51915776? 8e? Linux LVM
Partition 2 does not end on cylinder boundary.

?

Disk /dev/sdb: 17.2 GB, 17179869184 bytes

64 heads, 32 sectors/track, 16384 cylinders

Units = cylinders of 2048 * 512 = 1048576 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000

?

?

?

Disk /dev/sdc: 42.9 GB, 42949672960 bytes

64 heads, 32 sectors/track, 40960 cylinders

Units = cylinders of 2048 * 512 = 1048576 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000

?

?

?

Disk /dev/mapper/vg_redhat-lv_root: 49.0 GB, 48997859328 bytes

255 heads, 63 sectors/track, 5956 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000

?

?

?

Disk /dev/mapper/vg_redhat-lv_swap: 4160 MB, 4160749568 bytes

255 heads, 63 sectors/track, 505 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000

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[root@TEST ~]# fdisk /dev/sdc

Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel

Building a new DOS disklabel with disk identifier 0x93ae6d58.

Changes will remain in memory only, until you decide to write them.

After that, of course, the previous content won't be recoverable.

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Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

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WARNING: DOS-compatible mode is deprecated. It's strongly recommended to

? ? ? ? switch off the mode (command 'c') and change display units to

? ? ? ? sectors (command 'u').

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Command (m for help): n

Command action

? e? extended

? p? primary partition (1-4)

p

Partition number (1-4): 1

First cylinder (1-40960, default 1):

Using default value 1

Last cylinder, +cylinders or +size{K,M,G} (1-40960, default 40960): +40G

Value out of range.

Last cylinder, +cylinders or +size{K,M,G} (1-40960, default 40960): +39G

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Command (m for help): t

Selected partition 1

Hex code (type L to list codes): L

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?0? Empty? ? ? ? ? 24? NEC DOS? ? ? ? 81? Minix / old Lin bf? Solaris? ? ? ?

?1? FAT12? ? ? ? ? 39? Plan 9? ? ? ? ? 82? Linux swap / So c1? DRDOS/sec (FAT-

?2? XENIX root? ? ? 3c? PartitionMagic? 83? Linux? ? ? ? ? c4? DRDOS/sec (FAT-

?3? XENIX usr? ? ? 40? Venix 80286? ? 84? OS/2 hidden C:? c6? DRDOS/sec (FAT-

?4? FAT16 <32M? ? ? 41? PPC PReP Boot? 85? Linux extended? c7? Syrinx? ? ? ? ?

?5? Extended? ? ? ? 42? SFS? ? ? ? ? ? 86? NTFS volume set da? Non-FS data? ?

?6? FAT16? ? ? ? ? 4d? QNX4.x? ? ? ? ? 87? NTFS volume set db? CP/M / CTOS / .

?7? HPFS/NTFS? ? ? 4e? QNX4.x 2nd part 88? Linux plaintext de? Dell Utility? ?

?8? AIX? ? ? ? ? ? 4f? QNX4.x 3rd part 8e? Linux LVM? ? ? df? BootIt? ? ? ? ?

?9? AIX bootable? ? 50? OnTrack DM? ? ? 93? Amoeba? ? ? ? ? e1? DOS access? ? ?

?a? OS/2 Boot Manag 51? OnTrack DM6 Aux 94? Amoeba BBT? ? ? e3? DOS R/O? ? ? ?

?b? W95 FAT32? ? ? 52? CP/M? ? ? ? ? ? 9f? BSD/OS? ? ? ? ? e4? SpeedStor? ? ?

?c? W95 FAT32 (LBA) 53? OnTrack DM6 Aux a0? IBM Thinkpad hi eb? BeOS fs? ? ? ?

?e? W95 FAT16 (LBA) 54? OnTrackDM6? ? ? a5? FreeBSD? ? ? ? ee? GPT? ? ? ? ? ?

?f? W95 Ext'd (LBA) 55? EZ-Drive? ? ? ? a6? OpenBSD? ? ? ? ef? EFI (FAT-12/16/

10? OPUS? ? ? ? ? ? 56? Golden Bow? ? ? a7? NeXTSTEP? ? ? ? f0? Linux/PA-RISC b

11? Hidden FAT12? ? 5c? Priam Edisk? ? a8? Darwin UFS? ? ? f1? SpeedStor? ? ?

12? Compaq diagnost 61? SpeedStor? ? ? a9? NetBSD? ? ? ? ? f4? SpeedStor? ? ?

14? Hidden FAT16 <3 63? GNU HURD or Sys ab? Darwin boot? ? f2? DOS secondary?

16? Hidden FAT16? ? 64? Novell Netware? af? HFS / HFS+? ? ? fb? VMware VMFS? ?

17? Hidden HPFS/NTF 65? Novell Netware? b7? BSDI fs? ? ? ? fc? VMware VMKCORE

18? AST SmartSleep? 70? DiskSecure Mult b8? BSDI swap? ? ? fd? Linux raid auto

1b? Hidden W95 FAT3 75? PC/IX? ? ? ? ? bb? Boot Wizard hid fe? LANstep? ? ? ?

1c? Hidden W95 FAT3 80? Old Minix? ? ? be? Solaris boot? ? ff? BBT? ? ? ? ? ?

1e? Hidden W95 FAT1

Hex code (type L to list codes): 8e

Changed system type of partition 1 to 8e (Linux LVM)

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Command (m for help): p

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Disk /dev/sdc: 42.9 GB, 42949672960 bytes

64 heads, 32 sectors/track, 40960 cylinders

Units = cylinders of 2048 * 512 = 1048576 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x93ae6d58

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? Device Boot? ? ? Start? ? ? ? End? ? ? Blocks? Id? System

/dev/sdc1? ? ? ? ? ? ? 1? ? ? 39937? ? 40895472? 8e? Linux LVM

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Command (m for help): w

The partition table has been altered!

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Calling ioctl() to re-read partition table.

Syncing disks.

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[root@TEST ~]# fdisk -l

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Disk /dev/sda: 53.7 GB, 53687091200 bytes

64 heads, 32 sectors/track, 51200 cylinders

Units = cylinders of 2048 * 512 = 1048576 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x000af440

?

? Device Boot? ? ? Start? ? ? ? End? ? ? Blocks? Id? System

/dev/sda1? *? ? ? ? ? 2? ? ? ? 501? ? ? 512000? 83? Linux

Partition 1 does not end on cylinder boundary.

/dev/sda2? ? ? ? ? ? 502? ? ? 51200? ? 51915776? 8e? Linux LVM

Partition 2 does not end on cylinder boundary.

?

Disk /dev/sdb: 17.2 GB, 17179869184 bytes

64 heads, 32 sectors/track, 16384 cylinders

Units = cylinders of 2048 * 512 = 1048576 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000

?

?

?

Disk /dev/sdc: 42.9 GB, 42949672960 bytes

64 heads, 32 sectors/track, 40960 cylinders

Units = cylinders of 2048 * 512 = 1048576 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x93ae6d58

?

? Device Boot? ? ? Start? ? ? ? End? ? ? Blocks? Id? System

/dev/sdc1? ? ? ? ? ? ? 1? ? ? 39937? ? 40895472? 8e? Linux LVM

?

Disk /dev/mapper/vg_redhat-lv_root: 49.0 GB, 48997859328 bytes

255 heads, 63 sectors/track, 5956 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000

?

?

?

Disk /dev/mapper/vg_redhat-lv_swap: 4160 MB, 4160749568 bytes

255 heads, 63 sectors/track, 505 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000

?

?

?

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[root@TEST ~]# lvm

lvm> pvcreate /dev/sdc1

? Physical volume "/dev/sdc1" successfully created

lvm> pvremove /dev/sdc1

? Labels on physical volume "/dev/sdc1" successfully wiped

lvm> vgextend vg_redhat /dev/sdc1? ? 【不知道vg名字可以在root下執行vgdisplay查看】

? No physical volume label read from /dev/sdc1

? Physical volume /dev/sdc1 not found

? Physical volume "/dev/sdc1" successfully created

? Volume group "vg_redhat" successfully extended

lvm> lvextend -L +39G /dev/mapper/vg_redhat-lv_root

? Extending logical volume lv_root to 84.63 GiB

? Insufficient free space: 9984 extents needed, but only 9983 available

lvm> lvextend -L +38.99G /dev/mapper/vg_redhat-lv_root

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? Rounding size to boundary between physical extents: 38.99 GiB

? Extending logical volume lv_root to 84.62 GiB

? Logical volume lv_root successfully resized

lvm> pvdisplay

? --- Physical volume ---

? PV Name? ? ? ? ? ? ? /dev/sda2

? VG Name? ? ? ? ? ? ? vg_redhat

? PV Size? ? ? ? ? ? ? 49.51 GiB / not usable 3.00 MiB

? Allocatable? ? ? ? ? yes (but full)

? PE Size? ? ? ? ? ? ? 4.00 MiB

? Total PE? ? ? ? ? ? ? 12674

? Free PE? ? ? ? ? ? ? 0

? Allocated PE? ? ? ? ? 12674

? PV UUID? ? ? ? ? ? ? ILOutm-u1Gf-chRB-rhn4-RGVg-hcEb-mN02Fm

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? --- Physical volume ---

? PV Name? ? ? ? ? ? ? /dev/sdc1

? VG Name? ? ? ? ? ? ? vg_redhat

? PV Size? ? ? ? ? ? ? 39.00 GiB / not usable 4.98 MiB

? Allocatable? ? ? ? ? yes

? PE Size? ? ? ? ? ? ? 4.00 MiB

? Total PE? ? ? ? ? ? ? 9983

? Free PE? ? ? ? ? ? ? 9983

? Allocated PE? ? ? ? ? 0

? PV UUID? ? ? ? ? ? ? nrqQ7M-PCVI-cDAy-ufew-WYYv-8HPF-dRyraa

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lvm> quit

? Exiting.

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[root@TEST ~]# resize2fs /dev/mapper/vg_redhat-lv_root

resize2fs 1.41.12 (17-May-2010)

Filesystem at /dev/mapper/vg_redhat-lv_root is mounted on /; on-line resizing required

old desc_blocks = 3, new_desc_blocks = 6

Performing an on-line resize of /dev/mapper/vg_redhat-lv_root to 22183936 (4k) blocks.

The filesystem on /dev/mapper/vg_redhat-lv_root is now 22183936 blocks long.

這時,可以手工計算一下多了多少空間.
現在的年夜小為22183936 blocks,即22183936*4*1024bytes,拓展之前年夜小可以在fdisk -l命令下看到,為48997859328 bytes,由此可以計算增加的年夜小為：
(22183936*4*1024-48997859328)/1024^3=38.99G

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