KVM增加硬盘

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创建磁盘： qemu-img create -f raw  /data/kvm/test03_2.img 5G （原kvm为test03.img，增加一个硬盘test03_2.img）
关闭虚拟机： virsh destroy test03
编辑配置文件： virsh edit test03  增加如下：

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<disk type='file' device='disk'>        <driver name='qemu' type='raw' cache='none'/>         <source file='/data/kvm/test03_2.img'/>         <target dev='vdb' bus='virtio'/>       </disk>

开启虚拟机：virsh start test03
进入虚拟机：virsh console test03
分区： fdisk /dev/vdb

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Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel Building a new DOS disklabel with disk identifier 0x137d4ff1. 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): 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: 0x137d4ff1    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 (1-10402, 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: 0x137d4ff1    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! Calling ioctl() to re-read partition table. vdb: vdb1 Syncing disks.

格式化：mkfs.ext4 /dev/vdb1
挂载： mount /dev/vdb1 /mnt

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[iyunv@localhost ~]# df -h Filesystem            Size  Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root                        28G  762M   26G   3% / tmpfs                 250M     0  250M   0% /dev/shm /dev/vda1             477M   31M  421M   7% /boot /dev/vdb1             4.8G   10M  4.6G   1% /mnt