如何给linux添加磁盘并扩展逻辑卷

2023-10-17 1790阅读

如何给linux添加磁盘并扩展逻辑卷，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。

给linux添加磁盘并扩展逻辑卷

——生产实录

（图片来源网络，侵删）

fdisk -l

Disk /dev/sda: 21.5 GB, 21474836480 bytes

255 heads, 63 sectors/track, 2610 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: 0x000e7336

Device Boot Start End Blocks Id System

/dev/sda1 * 1 64 512000 83 Linux

Partition 1 does not end on cylinder boundary.

/dev/sda2 64 2611 20458496 8e Linux LVM

Disk /dev/sdb: 10.7 GB, 10737418240 bytes

255 heads, 63 sectors/track, 1305 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_minisite-lv_root: 16.7 GB, 16718495744 bytes

255 heads, 63 sectors/track, 2032 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_minisite-lv_swap: 4227 MB, 4227858432 bytes

255 heads, 63 sectors/track, 514 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

[root@minisite ~]# fdisk /dev/sdb

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

Building a new DOS disklabel with disk identifier 0x4cebbd75.

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

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

Warning: invalid flag 0x0000 of pa开发云主机域名rtition table 4 will be corrected by w(rite)

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’).

Command (m for help): p

Disk /dev/sdb: 10.7 GB, 10737418240 bytes

255 heads, 63 sectors/track, 1305 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: 0x4cebbd75

Device Boot Start End Blocks Id System

Command (m for help): n

Command action

e extended

p primary partition (1-4)

p

Partition number (1-4): 1

First cylinder (1-1305, default 1):

Using default value 1

Last cylinder, +cylinders or +size{K,M,G} (1-1305, default 1305):

Using default value 1305

Command (m for help): m

Command action

a toggle a bootable flag

b edit bsd disklabel

c toggle the dos compatibility flag

d delete a partition

l list known partition types

m print this menu

n add a new partition

o create a new empty DOS partition table

p print the partition table

q quit without saving changes

s create a new empty Sun disklabel

t change a partition’s system id

开发云主机域名u change display/entry units

v verify the partition table

w write table to disk and exit

x extra functionality (experts only)

Command (m for help): l

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

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

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

Command (m for help): t

Selected partition 1

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

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

Command (m for help): w

The partition table has been altered!

Calling ioctl() to re-read partition table.

Syncing disks.

[root@minisite ~]# partx -a /dev/sdb

BLKPG: Device or resource busy

error adding partition 1

[root@minisite ~]# lsblk

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT

sr0 11:0 1 1024M 0 rom

sda 8:0 0 20G 0 disk

忖sda1 8:1 0 500M 0 part /boot

忖sda2 8:2 0 19.5G 0 part

忖vg_minisite-lv_root (dm-0) 253:0 0 15.6G 0 lvm /

忖vg_minisite-lv_swap (dm-1) 253:1 0 4G 0 lvm [SWAP]

sdb 8:16 0 10G 0 disk

忖sdb1 8:17 0 10G 0 part

[root@minisite ~]# pvcreate /dev/sdb1

Physical volume “/dev/sdb1” successfully created

[root@minisite ~]# vgdisplay

— Volume group —

VG Name vg_minisite

System ID

Format lvm2

Metadata Areas 1

Metadata Sequence No 3

VG Access read/write

VG Status resizable

MAX LV 0

Cur LV 2

Open LV 2

Max PV 0

Cur PV 1

Act PV 1

VG Size 19.51 GiB

PE Size 4.00 MiB

Total PE 4994

Alloc PE / Size 4994 / 19.51 GiB

Free PE / Size 0 / 0

VG UUID 8ZwMrO-qNqg-Xdsn-l8SG-ecZf-WFbB-R4Si2z

[root@minisite ~]# lvdisplay

— Logical volume —

LV Path /dev/vg_minisite/lv_root

LV Name lv_root

VG Name vg_minisite

LV UUID owBHOh-LSip-wWFx-CTtU-sezw-6tE9-VzVMHz

LV Write Access read/write

LV Creation host, time minisite, 2013-12-27 18:09:52 +0800

LV Status available

# open 1

LV Size 15.57 GiB

Current LE 3986

Segments 1

Allocation inherit

Read ahead sectors auto

– currently set to 256

Block device 253:0

— Logical volume —

LV Path /dev/vg_minisite/lv_swap

LV Name lv_swap

VG Name vg_minisite

LV UUID vCCRq7-CdkY-erXQ-ZFPX-3Bi1-yaxi-efTvul

LV Write Access read/write

LV Creation host, time开发云主机域名 minisite, 2013-12-27 18:09:59 +0800

LV Status available

# open 1

LV Size 3.94 GiB

Current LE 1008

Segments 1

Allocation inherit

Read ahead sectors auto

– currently set to 256

Block device 253:1

[root@minisite ~]# vgextend vg_minisite /dev/sdb1

Volume group “vg_minisite” successfully extended

[root@minisite ~]# vgdisplay

— Volume group —

VG Name vg_minisite

System ID

Format lvm2

Metadata Areas 2

Metadata Sequence No 4

VG Access read/write

VG Status resizable

MAX LV 0

Cur LV 2

Open LV 2

Max PV 0

Cur PV 2

Act PV 2

VG Size 29.50 GiB

PE Size 4.00 MiB

Total PE 7552

Alloc PE / Size 4994 / 19.51 GiB

Free PE / Size 2558 / 9.99 GiB

VG UUID 8ZwMrO-qNqg-Xdsn-l8SG-ecZf-WFbB-R4Si2z

[root@minisite ~]# lvextend -l +2558 /dev/vg_minisite/lv_root #-l是按照pe的方式计算，一个PE是4M。

Extending logical volume lv_root to 25.56 GiB

Logical volume lv_root successfully resized

注释：上面是用PE来计算的空间，即2558（个）*4M；当然也可以直接加空间大小，这样更方便：lvextend -L+2G /dev/vg_minisite/lv_root

[root@minisite ~]# resize2fs /dev/vg_minisite/lv_root #使扩展的逻辑卷生效

resize2fs 1.41.12 (17-May-2010)

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

old desc_blocks = 1, new_desc_blocks = 2

Performing an on-line resize of /dev/vg_minisite/lv_root to 6701056 (4k) blocks.

The filesystem on /dev/vg_minisite/lv_root is now 6701056 blocks long.

[root@minisite ~]# df -h

Filesystem Size Used Avail Use% Mounted on

/dev/mapper/vg_minisite-lv_root

26G 5.2G 19G 22% /

tmpfs 939M 0 939M 0% /dev/shm

/dev/sda1 485M 37M 423M 9% /boot看完上述内容，你们掌握如何给linux添加磁盘并扩展逻辑卷的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注开发云行业资讯频道，感谢各位的阅读！