KVM中Linux虚拟机的硬盘添加方法
# df -hTFilesystem Type SizeUsed Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
ext4 8.3G937M7.0G12% /
tmpfs tmpfs119M 0119M 0% /dev/shm
/dev/vda1 ext4 477M 33M419M 8% /boot
#
生成一块新的硬盘
# qemu-img create -f raw o5cache.add.disk.raw 2G
Formatting '05cache.add.disk.raw', fmt=raw size=2147483648
<disk type='file' device='disk'>
<driver name='qemu' type='raw' cache='none'/>
<source file='/home/virhost/05cache.add.disk.raw'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
</disk>
# virsh start 05cache
Domain 05cache started
# virsh attach-disk 05cache /home/virhost/05cache.add.disk.raw vdb --cache none
Disk attached successfully
virsh edit 05cache---------------->
<disk type='file' device='disk'>
<driver name='qemu' type='raw' cache='none'/>
<source file='/home/virhost/05cache.img'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
</disk>
<disk type='block' device='cdrom'>
<driver name='qemu' type='raw'/>
<target dev='hdc' bus='ide'/>
<readonly/>
<address type='drive' controller='0' bus='1' target='0' unit='0'/>
</disk>
# fdisk -l
Disk /dev/vda: 10.7 GB, 10737418240 bytes
16 heads, 63 sectors/track, 20805 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: 0x000c1fb8
Device Boot Start End Blocks IdSystem
/dev/vda1 * 3 1018 512000 83Linux
Partition 1 does not end on cylinder boundary.
/dev/vda2 1018 20806 9972736 8eLinux LVM
Partition 2 does not end on cylinder boundary.
Disk /dev/vdb: 2147 MB, 2147483648 bytes #挂上的新的硬盘
16 heads, 63 sectors/track, 4161 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: 9168 MB, 9168748544 bytes
255 heads, 63 sectors/track, 1114 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
在虚拟机中对硬盘进行格式化
# mkfs.ext4 /dev/vdb
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
131072 inodes, 524288 blocks
26214 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=536870912
16 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912
Writing inode tables: done
Creating journal (16384 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 34 mounts or
180 days, whichever comes first.Use tune2fs -c or -i to override.
接下来建一个目录来挂载新的硬盘：
# mkdir /nd
# mkdir /nd
# mount /dev/vdb /nd/
＃获取硬盘的UUID
# blkid /dev/vdb
/dev/vdb: UUID="a35e0890-3aa6-47a7-921c-c2cb9dd431e6" TYPE="ext4"
将挂载添加到开机启动中：
# cat /etc/fstab
#
# /etc/fstab
# Created by anaconda on Tue Jun 28 08:57:38 2016
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/VolGroup-lv_root / ext4 defaults 1 1
UUID=04e8e77f-2604-4683-833b-a06a7300c7a3 /boot ext4 defaults 1 2
/dev/mapper/VolGroup-lv_swap swap swap defaults 0 0
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devptsgid=5,mode=6200 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
UUID=a35e0890-3aa6-47a7-921c-c2cb9dd431e6 /ndext4 defaults 1 2
# df -h
Filesystem SizeUsed Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
8.3G644M7.3G 9% /
tmpfs 119M 0119M 0% /dev/shm
/dev/vda1 477M 33M419M 8% /boot
/dev/vdb 2.0G3.0M1.9G 1% /nd
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