step1:创建一个qcow2格式的磁盘镜像
[root@kvm ~]# qemu-img create -f qcow2 /kvm/centos1_1.qcow2 5G
Formatting '/kvm/centos1_1.qcow2', fmt=qcow2 size=5368709120 encryption=off cluster_size=65536
[root@kvm ~]# virsh destroy centos1
Domain centos1 destroyed
step2:编辑/etc/libvirt/qemu/centos1.xml 增加磁盘模块
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[root@kvm ~] # vim /etc/libvirt/qemu/centos1.xml
或者 [root@kvm ~] # virsh edit centos1
<disk type = 'file' device= 'disk' >
<driver name= 'qemu' type = 'qcow2' cache= 'none' />
< source file = '/kvm/centos1_1.qcow2' />
<target dev= 'vdb' bus= 'virtio' />
< /disk >
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开启虚拟机
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[root@kvm ~] # virsh start centos1
[root@kvm ~] # virsh console centos1
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step3:分区
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[root@localhost ~] # fdisk -l
Disk /dev/vda : 16.1 GB, 16106127360 bytes
16 heads, 63 sectors /track , 31207 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes Sector size (logical /physical ): 512 bytes / 512 bytes
I /O size (minimum /optimal ): 512 bytes / 512 bytes
Disk identifier: 0x000e5856 Device Boot Start End Blocks Id System
/dev/vda1 * 3 1018 512000 83 Linux
Partition 1 does not end on cylinder boundary. /dev/vda2 1018 20806 9972736 8e Linux LVM
Partition 2 does not end on cylinder boundary. /dev/vda3 20807 31207 5242104 83 Linux
Disk /dev/vdb : 5368 MB, 5368709120 bytes
16 heads, 63 sectors /track , 10402 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes Sector size (logical /physical ): 512 bytes / 512 bytes
I /O size (minimum /optimal ): 512 bytes / 512 bytes
Disk identifier: 0x00000000 Disk /dev/mapper/VolGroup-lv_root : 14.5 GB, 14533263360 bytes
255 heads, 63 sectors /track , 1766 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/VolGroup-lv_swap : 1040 MB, 1040187392 bytes
255 heads, 63 sectors /track , 126 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 |
分区
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[root@localhost ~] # fdisk /dev/vdb
Command (m for help): p
Command (m for help): n
Command action e extended
p primary partition (1-4)
p Partition number (1-4): Value out of range. Partition number (1-4): 1 First cylinder (1-10402, default 1): Using default value 1 Last cylinder, +cylinders or +size{K,M,G} (1-10402, default 10402): Using default value 10402 Command (m for help): p
Disk /dev/vdb : 5368 MB, 5368709120 bytes
16 heads, 63 sectors /track , 10402 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes Sector size (logical /physical ): 512 bytes / 512 bytes
I /O size (minimum /optimal ): 512 bytes / 512 bytes
Disk identifier: 0x3d00f46a Device Boot Start End Blocks Id System
/dev/vdb1 1 10402 5242576+ 83 Linux
Command (m for help): w
The partition table has been altered! |
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[root@localhost ~] # partx /dev/vdb
# 1: 63- 10485215 ( 10485153 sectors, 5368 MB) # 2: 0- -1 ( 0 sectors, 0 MB) # 3: 0- -1 ( 0 sectors, 0 MB) # 4: 0- -1 ( 0 sectors, 0 MB) [root@localhost ~] # ll /dev/vdb*
brw-rw----. 1 root disk 252, 16 Jan 17 01:22 /dev/vdb
brw-rw----. 1 root disk 252, 17 Jan 17 01:22 /dev/vdb1
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格式化
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[root@localhost ~] # mkfs.ext4 /dev/vdb1
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 327680 inodes, 1310644 blocks 65532 blocks (5.00%) reserved for the super user
First data block=0 Maximum filesystem blocks=1342177280 40 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 Writing inode tables: done Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 27 mounts or 180 days, whichever comes first. Use tune2fs -c or -i to override. |
挂载/自动挂载
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[root@localhost ~] # mkdir /data
[root@localhost ~] # mount /dev/vdb1 /data/
EXT4-fs (vdb1): mounted filesystem with ordered data mode. Opts: |
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[root@localhost ~] # df -Th
Filesystem Type Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root ext4 14G 685M 12G 6% /
tmpfs tmpfs 246M 0 246M 0% /dev/shm
/dev/vda1 ext4 477M 33M 419M 8% /boot
/dev/vdb1 ext4 4.8G 10M 4.6G 1% /data
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[root@localhost ~] # vi /etc/fstab
/dev/vdb1 /data ext4 defaults 0 0
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本文转自 HMLinux 51CTO博客,原文链接:http://blog.51cto.com/7424593/1735600