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CentOS6.5 LVM分区使用详解

时间:2014-06-25 12:18 来源:网络整理 作者:51ou.com 阅读:

1, 介绍

LVM是逻辑盘卷管理(Logical Volume Manager)的简称,它是Linux环境下对磁盘分区进行管理的一种机制,LVM是建立在硬盘和分区之上的一个逻辑层,来提高磁盘分 LVM

区管理的灵活性。前面谈到,LVM是在磁盘分区和文件系统之间添加的一个逻辑层,来为文件系统屏蔽下层磁盘分区布局,提供一个抽象的盘卷,在盘卷上建立文件系统。物理卷(physical volume)物理卷就是指硬盘分区或从逻辑上与磁盘分区具有同样功能的设备(如RAID),是LVM的基本存储逻辑块,但和基本的物理存储介质(如分区、磁盘等)比较,却包含有与LVM相关的管理参数。

2,创建

[root@cn-iss-install-01 mapper]# fdisk -l

[root@cn-iss-install-01 mapper]# 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 0x874c7742.

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 partition 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): 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

   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): p

Disk /dev/sdb: 96.6 GB, 96636764160 bytes

255 heads, 63 sectors/track, 11748 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: 0x874c7742

   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 (1-11748, default 1):

Using default value 1

Last cylinder, +cylinders or +size{K,M,G} (1-11748, default 11748): +80G

Command (m for help): p

Disk /dev/sdb: 96.6 GB, 96636764160 bytes

255 heads, 63 sectors/track, 11748 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: 0x874c7742

   Device Boot      Start         End      Blocks   Id System

/dev/sdb1               1       10444    83891398+   5 Extended

Command (m for help): w

The partition table has been altered!

Calling ioctl() to re-read partition table.

Syncing disks.

[root@cn-iss-install-01 mapper]#reboot or

[root@cn-iss-install-01 Packages]# partprobe

[root@cn-iss-install-01 ~]# fdisk -l

Disk /dev/sda: 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: 0x0005b1c0

   Device Boot      Start         End      Blocks   Id System

/dev/sda1   *           2         251      256000   83 Linux

Partition 1 does not end on cylinder boundary.

/dev/sda2             252       16384    16520192   8e Linux LVM

Partition 2 does not end on cylinder boundary.

Disk /dev/sdb: 96.6 GB, 96636764160 bytes

255 heads, 63 sectors/track, 11748 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: 0x874c7742

   Device Boot      Start         End      Blocks   Id System

/dev/sdb1               1       10444    83891398+   5 Extended

Disk /dev/mapper/VG00-LV_rootfs: 16.4 GB, 16374562816 bytes

255 heads, 63 sectors/track, 1990 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/VG00-LV_swap: 536 MB, 536870912 bytes

255 heads, 63 sectors/track, 65 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@cn-iss-install-01 ~]#

[root@cn-iss-install-01 Packages]# pvcreate /dev/sdb1

 Writing physical volume data to disk "/dev/sdb1"

 Physical volume "/dev/sdb1" successfully created

[root@cn-iss-install-01 Packages]#

[root@cn-iss-install-01 Packages]# vgcreate vg03 /dev/sdb1

 Volume group "vg03" successfully created

[root@cn-iss-install-01 Packages]# lvcreate -L 83G -n vgdata vg03

[root@cn-iss-install-01 Packages]# mke2fs /dev/vg03/vgdata

mke2fs 1.41.12 (17-May-2010)

Filesystem label=

OS type: Linux

Block size=4096 (log=2)

Fragment size=4096 (log=2)

Stride=0 blocks, Stripe width=0 blocks

5439488 inodes, 21757952 blocks

1087897 blocks (5.00%) reserved for the super user

First data block=0

Maximum filesystem blocks=4294967296

664 block groups

32768 blocks per group, 32768 fragments per group

8192 inodes per group

Superblock backups stored on blocks:

        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,

        4096000, 7962624, 11239424, 20480000

Writing inode tables: done

Writing superblocks and filesystem accounting information:

done

This filesystem will be automatically checked every 23 mounts or

180 days, whichever comes first. Use tune2fs -c or -i to override.

[root@cn-iss-install-01 Packages]#

[root@cn-iss-install-01 Packages]#

[root@cn-iss-install-01 Packages]# mkf

mkfifo        mkfs.cramfs   mkfs.ext3     mkfs.ext4dev

mkfs          mkfs.ext2     mkfs.ext4

[root@cn-iss-install-01 Packages]# mkfs.ext4 /dev/vg03/vgdata

mke2fs 1.41.12 (17-May-2010)

Filesystem label=

OS type: Linux

Block size=4096 (log=2)

Fragment size=4096 (log=2)

Stride=0 blocks, Stripe width=0 blocks

5439488 inodes, 21757952 blocks

1087897 blocks (5.00%) reserved for the super user

First data block=0

Maximum filesystem blocks=4294967296

664 block groups

32768 blocks per group, 32768 fragments per group

8192 inodes per group

Superblock backups stored on blocks:

        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,

        4096000, 7962624, 11239424, 20480000

Writing inode tables: done

Creating journal (32768 blocks): done

Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 37 mounts or

180 days, whichever comes first. Use tune2fs -c or -i to override.

[root@cn-iss-install-01 Packages]#

[root@cn-iss-install-01 spool]# mount /dev/vg03/vgdata /var/spool/repo/

[root@cn-iss-install-01 spool]# cd repo/

[root@cn-iss-install-01 repo]# ls

lost+found

[root@cn-iss-install-01 repo]# pwd

/var/spool/repo

[root@cn-iss-install-01 repo]#

3,常用检查命令:

[root@cn-iss-install-01 /]# pvdisplay

[root@cn-iss-install-01 /]# vgdisplay

[root@cn-iss-install-01 /]# lvdisplay

[root@cn-iss-install-01 /]# pvcreate

 Please enter a physical volume path

 Run `pvcreate --help' for more information.

[root@cn-iss-install-01 /]# vgcreate

 Please provide volume group name and physical volumes

 Run `vgcreate --help' for more information.

[root@cn-iss-install-01 /]# lvcreate

 Please provide a volume group name

 Run `lvcreate --help' for more information.

[root@cn-iss-install-01 /]# vgextend

 Please enter volume group name and physical volume(s)

  Run `vgextend --help' for more information.

[root@cn-iss-install-01 /]# lvextend

 Please specify either size or extents but not both.

 Run `lvextend --help' for more information.

[root@cn-iss-install-01 /]#

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