linux中CentOS/redhat6.5LVM分区使用的示例分析
小编给大家分享一下linux中CentOS/redhat 6.5 LVM分区使用的示例分析,相信大部分人都还不怎么了解,因此分享这篇文章给大家参考一下,希望大家阅读完这篇文章后大有收获,下面让我们一起去了解一下吧!
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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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