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lvm镜像实验
实验环境
# uname -a
Linux localhost.localdomain 3.10.0-123.el7.x86_64#1 SMP Mon Jun 30 12:09:22 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
cat /etc/redhat-release
CentOS Linux release 7.0.1406 (Core)
添加两块新硬盘做来实验。
操作步骤
创建分区
先分别在两个磁盘上创建六个分区，然后查看分区
# fdisk /dev/sdb
# fdisk /dev/sdc
# fdisk -l
Disk /dev/sda: 42.9 GB, 42949672960 bytes, 83886080 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk label type: dos Disk identifier: 0x000eebc4
Device Boot Start End Blocks Id System /dev/sda1 * 2048 1026047 512000 83 Linux /dev/sda2 1026048 83886079 41430016 8e Linux LVM
Disk /dev/sdb: 32.2 GB, 32212254720 bytes, 62914560 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk label type: dos Disk identifier: 0xadd8c239
Device Boot Start End Blocks Id System /dev/sdb1 2048 2099199 1048576 83 Linux /dev/sdb2 2099200 4196351 1048576 83 Linux
Disk /dev/sdc: 32.2 GB, 32212254720 bytes, 62914560 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk label type: dos Disk identifier: 0xe5fdf0d8
Device Boot Start End Blocks Id System /dev/sdc1 2048 2099199 1048576 83 Linux /dev/sdc2 2099200 4196351 1048576 83 Linux |
建立RAID 卷
开始创建RAID，首现将硬盘，每两个一组做成raid 1级别的raid盘。利用命令mdadm：
# mdadm -C /dev/md1 -a yes -l 1 -n 2 /dev/sdb1/dev/sdc1
mdadm: Note: this array has metadata at the start and may not be suitable as a boot device. If you plan to store ‘/boot‘ on this device please ensure that your boot-loader understands md/v1.x metadata, or use --metadata=http://www.mamicode.com/0.90 Continue creating array? y mdadm: Defaulting to version 1.2 metadata mdadm: array /dev/md1 started.
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再创建RAID 0卷。利用命令mdadm
# mdadm -C /dev/md0 -l 0 -n 2 /dev/sdb2 /dev/sdc2
mdadm: Defaulting to version 1.2 metadata mdadm: array /dev/md0 started. |
然后可以查看一下
# cat /proc/mdstat
Personalities : [raid1] [raid0] md0 : active raid0 sdc2[1] sdb2[0] 2096128 blocks super 1.2 512k chunks
md1 : active raid1 sdc1[1] sdb1[0] 1048000 blocks super 1.2 [2/2] [UU]
unused devices: <none> |
建立lvm
首现创建PV—物理卷
# pvcreate /dev/md0 Physical volume "/dev/md0" successfully created |
创建了物理卷，我们就可以把它加入到卷组中
# vgcreate vg1 /dev/md0 Volume group "vg1" successfully created |
有了vg，我们可以进一步划分，划分我们想要的逻辑卷
# lvcreate -L 1G -n lv1 vg1 Logical volume "lv1" created |
最后我们可以格式化lv1
# mkfs.ext4 /dev/vg1/lv1
mke2fs 1.42.9 (28-Dec-2013) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=128 blocks, Stripe width=256 blocks 65536 inodes, 262144 blocks 13107 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=268435456 8 block groups 32768 blocks per group, 32768 fragments per group 8192 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376
Allocating group tables: done Writing inode tables: done Creating journal (8192 blocks): done Writing superblocks and filesystem accounting information: done |
最后将lv1挂载到我们的目录下就完成了
# mkdir /data
# mount /dev/vg1/lv1 /data
本文出自 “郭坤” 博客，请务必保留此出处http://guo12.blog.51cto.com/9273463/1540298