KVM虚拟机怎么扩展磁盘空间

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KVM支持在线扩展磁盘空间，支持RHEL系列6以上的版本

列出在线虚拟机磁盘

[root@e3 images]# virsh list --all Id    名称                         状态---------------------------------------------------- 29    centos6.6                      running 41    centos6.5                      running -     kvm001                         关闭 -     kvm002                         关闭 -     kvm003                         关闭 -     template                       关闭[root@e3 images]# virsh domblklist centos6.5  #列出在线虚拟机磁盘情况目标     源------------------------------------------------vda        /data/kvm/images/centos6.5.qcow2[root@e3 images]#

创建一块qcow2磁盘并在线添加

[root@e3 images]# qemu-img create -f qcow2 centos6.5-add.qcow2 5G #创建一块5G大小的硬盘Formatting 'centos6.5-add.qcow2', fmt=qcow2 size=5368709120 encryption=off cluster_size=65536 lazy_refcounts=off [root@e3 images]# ll centos6.5-add.qcow2 -rw-r--r--. 1 root root 197120 1月  21 18:31 centos6.5-add.qcow2#在线添加磁盘[root@e3 images]# virsh attach-disk centos6.5 /data/kvm/images/centos6.5-add.qcow2 vdb --cache=none --subdriver=qcow2   ##成功附加磁盘

查看

[root@e3 images]# virsh domblklist centos6.5  目标     源------------------------------------------------vda        /data/kvm/images/centos6.5.qcow2vdb        /data/kvm/images/centos6.5-add.qcow2  #添加成功#切换虚拟机里查看[root@kvm003 ~]# fdisk -lDisk /dev/vda: 32.2 GB, 32212254720 bytes16 heads, 63 sectors/track, 62415 cylindersUnits = cylinders of 1008 * 512 = 516096 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x000903e2   Device Boot      Start         End      Blocks   Id  System/dev/vda1   *           3        1018      512000   83  LinuxPartition 1 does not end on cylinder boundary./dev/vda2            1018       41611    20458496   8e  Linux LVMPartition 2 does not end on cylinder boundary.Disk /dev/mapper/VolGroup-lv_root: 19.9 GB, 19906166784 bytes255 heads, 63 sectors/track, 2420 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x00000000Disk /dev/mapper/VolGroup-lv_swap: 1040 MB, 1040187392 bytes255 heads, 63 sectors/track, 126 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x00000000Disk /dev/vdb: 5368 MB, 5368709120 bytes   #添加的16 heads, 63 sectors/track, 10402 cylindersUnits = cylinders of 1008 * 512 = 516096 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x00000000

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