CentOS下LVM 增加、扩容逻辑卷

浏览次数:2686 关键词 （ 逻辑  CentOS  LVM  ）

1.查看硬盘分区情况

#fdisk -l

注：假设新增一个硬盘的设备文件名为/dev/sdb

2.开始分区

#fdisk /dev/sdb

3.查看指令帮助信息

Command (m for help): m

4.查看已有分区表

Command (m for help): p

Disk /dev/sdb: 500.0 GB, 500097376256 bytes
255 heads, 63 sectors/track, 60800 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdb1 * 1 60800 488375968 7 HPFS/NTFS

注：可以看出此硬盘已经有一个分区，且所有的柱面都已分配

5.删除原有分区

Command (m for help): d

6.再次查看分区表

Command (m for help): p

Disk /dev/sdb: 500.0 GB, 500097376256 bytes
255 heads, 63 sectors/track, 60800 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

7.新增分区

Command (m for help): n

Command action
e extended
p primary partition (1-4)

8.选择分区类型（主分区、扩展分区）、第几个分区

p

1

9.设置分区的柱面范围，这里开始与结束都默认，直接回车

10.查看分区表

Command (m for help): p

Disk /dev/sdb: 500.0 GB, 500097376256 bytes
255 heads, 63 sectors/track, 60800 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdb1 1 60800 488375968+ 83 Linux

11.更改分区的类型

Command (m for help): t
Selected partition 1
Hex code (type L to list codes):L

注：如果有多个分区，会出现提示选择分区

10  Empty           1e  Hidden W95 FAT1 80  Old Minix       bf  Solaris      21  FAT12           24  NEC DOS         81  Minix / old Lin c1  DRDOS/sec (FAT-32  XENIX root      39  Plan 9          82  Linux swap / So c4  DRDOS/sec (FAT-43  XENIX usr       3c  PartitionMagic  83  Linux           c6  DRDOS/sec (FAT-54  FAT16 <32M      40  Venix 80286     84  OS/2 hidden C:  c7  Syrinx       65  Extended        41  PPC PReP Boot   85  Linux extended  da  Non-FS data  76  FAT16           42  SFS             86  NTFS volume set db  CP/M / CTOS / .87  HPFS/NTFS       4d  QNX4.x          87  NTFS volume set de  Dell Utility 98  AIX             4e  QNX4.x 2nd part 88  Linux plaintext df  BootIt       109  AIX bootable    4f  QNX4.x 3rd part 8e  Linux LVM       e1  DOS access   11a  OS/2 Boot Manag 50  OnTrack DM      93  Amoeba          e3  DOS R/O      12b  W95 FAT32       51  OnTrack DM6 Aux 94  Amoeba BBT      e4  SpeedStor    13c  W95 FAT32 (LBA) 52  CP/M            9f  BSD/OS          eb  BeOS fs      14e  W95 FAT16 (LBA) 53  OnTrack DM6 Aux a0  IBM Thinkpad hi ee  EFI GPT      15f  W95 Ext'd (LBA) 54  OnTrackDM6      a5  FreeBSD         ef  EFI (FAT-12/16/1610  OPUS            55  EZ-Drive        a6  OpenBSD         f0  Linux/PA-RISC b1711  Hidden FAT12    56  Golden Bow      a7  NeXTSTEP        f1  SpeedStor    1812  Compaq diagnost 5c  Priam Edisk     a8  Darwin UFS      f4  SpeedStor    1914  Hidden FAT16 <3 61  SpeedStor       a9  NetBSD          f2  DOS secondary2016  Hidden FAT16    63  GNU HURD or Sys ab  Darwin boot     fb  VMware VMFS  2117  Hidden HPFS/NTF 64  Novell Netware  b7  BSDI fs         fc  VMware VMKCORE2218  AST SmartSleep  65  Novell Netware  b8  BSDI swap       fd  Linux raid auto231b  Hidden W95 FAT3 70  DiskSecure Mult bb  Boot Wizard hid fe  LANstep      241c  Hidden W95 FAT3 75  PC/IX           be  Solaris boot    ff  BBT      

12.将磁盘格式设置为linux LVM

Hex code (type L to list codes): 8e
Changed system type of partition 1 to 8e (Linux LVM)

13.再次查看分区表

Command (m for help): p

Disk /dev/sdb: 500.0 GB, 500097376256 bytes
255 heads, 63 sectors/track, 60800 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdb1 1 60800 488375968+ 8e Linux LVM

14.保存，退出fdisk

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.

如果出错，使用partprobe指令重载分区表

15.查看硬盘分区情况

#fdisk -l

Disk /dev/sdb: 500.0 GB, 500097376256 bytes
255 heads, 63 sectors/track, 60800 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdb1 1 60800 488375968+ 8e Linux LVM

16.查看系统中已有的物理卷

#pvdisplay

--- Physical volume ---
PV Name /dev/sda2
VG Name VolGroup00
PV Size 297.99 GB / not usable 20.87 MB
Allocatable yes (but full)
PE Size (KByte) 32768
Total PE 9535
Free PE 0
Allocated PE 9535
PV UUID oa2rNU-Tz2c-N1W0-AKcV-9UnE-ctdp-38dFQd

17.建立物理卷

#pvcreate /dev/sdb1

Writing physical volume data to disk "/dev/sdb1"
Physical volume "/dev/sdb1" successfully created

18.将新物理卷加入到卷组中

#vgextend VolGroup00 /dev/sdb1

Volume group "VolGroup00" successfully extended

19.将新的空间加到原有逻辑卷中去

#lvextend -L+500G /dev/VolGroup00/LogVol00

20.激活扩容的LVM分区

#resize2fs -p /dev/VolGroup00/LogVol00

21.如果不扩容，可以增加逻辑卷

#lvcreate -L 200G -n lvol0 VolGroup00

Logical volume "lvol0" created

22.删除逻辑卷

#lvremove /dev/mapper/VolGroup00-lvol0

23.查看已经存在的逻辑卷

#lvdisplay
--- Logical volume ---
LV Name /dev/VolGroup00/LogVol00
VG Name VolGroup00
LV UUID ipf0Gk-3xXU-vN0I-cXbm-ZKLD-XUju-mDe02Z
LV Write Access read/write
LV Status available
# open 1
LV Size 48.81 GB
Current LE 1562
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0

--- Logical volume ---
LV Name /dev/VolGroup00/LogVol02
VG Name VolGroup00
LV UUID RybA0Q-5B8T-bOwA-SsPK-Prai-qsix-kCeWWI
LV Write Access read/write
LV Status available
# open 1
LV Size 49.91 GB
Current LE 1597
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1

--- Logical volume ---
LV Name /dev/VolGroup00/LogVol03
VG Name VolGroup00
LV UUID czznK0-VsUK-VAtj-Vbam-PDJS-1yZt-A6BPgK
LV Write Access read/write
LV Status available
# open 1
LV Size 195.31 GB
Current LE 6250
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:2

--- Logical volume ---
LV Name /dev/VolGroup00/LogVol01
VG Name VolGroup00
LV UUID zvLpEL-Dj8Y-a0XG-4H7q-ZPaa-XUXY-0ln7qw
LV Write Access read/write
LV Status available
# open 1
LV Size 3.94 GB
Current LE 126
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:3

24.正式新增逻辑卷

#lvcreate -L 500G -n LogVol04 VolGroup00

25.格式化新增逻辑卷

#mkfs.ext3 /dev/mapper/VolGroup00-LogVol04

26.挂载逻辑卷

#mount /dev/mapper/VolGroup00-LogVol04 /data

27.编辑/etc/fstab将新增逻辑卷设置开机挂载，新增下面一行

/dev/VolGroup00/LogVol04 /data ext3 defaults 1 2

28.测试挂载

mount -a

29.查看并删除物理卷

查看挂载情况

#df -h
/dev/mapper/VolGroup00-LogVol04
296G 245M 281G 1% /backup

卸载

#umount /backup

删除逻辑卷

#lvremove /dev/mapper/VolGroup00-LogVol04

查看物理卷

#pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name VolGroup00
PV Size 297.99 GB / not usable 20.87 MB
Allocatable yes (but full)
PE Size (KByte) 32768
Total PE 9535
Free PE 0
Allocated PE 9535
PV UUID oa2rNU-Tz2c-N1W0-AKcV-9UnE-ctdp-38dFQd

--- Physical volume ---
PV Name /dev/sdb1
VG Name VolGroup00
PV Size 465.75 GB / not usable 1.66 MB
Allocatable yes
PE Size (KByte) 32768
Total PE 14904
Free PE 5304
Allocated PE 9600
PV UUID avEKz2-t5Ko-jsn0-Pvuh-h8DJ-GV0o-ZQfBOL

将物理卷从卷组中移除

#vgreduce VolGroup00 /dev/sdb1

删除物理卷

#pvremove /dev/sdb1

这样就可以重新进行格式化磁盘