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          2. linux CentOS/redhat 6.5 LVM分区如何使用

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            • 来源:124软件资讯网

                1, 先容

                LVM是逻辑盘卷治理(Logical Volume Manager)的简称  ,它是Linux情况下对磁盘分区举行治理的一种机制 ,LVM是建设在硬盘和分区之上的一个逻辑层  ,来提高磁盘分 LVM

                区治理的天真性  。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  ,来为文件系统屏障下层磁盘分区结构  ,提供一个抽象的盘卷  ,在盘卷上建设文件系统  。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效的装备(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)比力 ,却包罗有与LVM相关的治理参数  。

                2  ,建立

                [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 ,常用检查下令:

                [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 /]#