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这篇文章给大家介绍 Xen 虚拟机怎样扩展磁盘，内容非常详细，感兴趣的小伙伴们可以参考借鉴，希望对大家能有所帮助。
扩展之前磁盘空间大小
[root@localhost ~]# df -THP
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root ext4 8.9G 642M 7.8G 8% /
tmpfs tmpfs 257M 0 257M 0% /dev/shm
/dev/xvda1 ext4 500M 27M 448M 6% /boot创建磁盘不用关闭虚拟机有点生猛
dd if=/dev/zero bs=1024M count=4 /data/centos6.6.img # 直接追加到磁盘 查看
[root@localhost ~]# df -TH
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
ext4 8.9G 642M 7.8G 8% /
tmpfs tmpfs 257M 0 257M 0% /dev/shm
/dev/xvda1 ext4 500M 27M 448M 6% /boot
上面查看好像没变其实添加到磁盘了没分
[root@localhost ~]# fdisk -l
Disk /dev/xvda: 15.0 GB, 15032390656 bytes # 总大小已经变了
255 heads, 63 sectors/track, 1827 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: 0x000398a4
Device Boot Start End Blocks Id System
/dev/xvda1 * 1 64 512000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/xvda2 64 1306 9972736 8e Linux LVM
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扩展
fdisk /dev/xvda 分区分成 lvm 。。省略
[root@localhost ~]# partprobe
[root@localhost ~]# cat /proc/partitions
major minor #blocks name
202 0 14680069 xvda
202 1 512000 xvda1
202 2 9972736 xvda2
202 3 4189617 xvda3
253 0 8953856 dm-0
253 1 1015808 dm-1
[root@localhost ~]# pvcreate /dev/xvda3
Physical volume /dev/xvda3 successfully created
[root@localhost ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/xvda2 VolGroup lvm2 a-- 9.51g 0
/dev/xvda3 lvm2 --- 4.00g 4.00g
[root@localhost ~]# vgextend VolGroup /dev/xvda3
Volume group VolGroup successfully extended
[root@localhost ~]# lvextend -l +100%FREE /dev/VolGroup/lv_root
Size of logical volume VolGroup/lv_root changed from 8.54 GiB (2186 extents) to 12.53 GiB (3208 extents).
Logical volume lv_root successfully resized
[root@localhost ~]# resize2fs -P /dev/VolGroup/lv_root
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/VolGroup/lv_root is mounted on /; on-line resizing required
old desc_blocks = 1, new_desc_blocks = 1
Performing an on-line resize of /dev/VolGroup/lv_root to 3284992 (4k) blocks.
The filesystem on /dev/VolGroup/lv_root is now 3284992 blocks long.
[root@localhost ~]# df -TH
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
ext4 14G 722M 12G 6% /
tmpfs tmpfs 257M 0 257M 0% /dev/shm
/dev/xvda1 ext4 500M 27M 448M 6% /boot关于 Xen 虚拟机怎样扩展磁盘就分享到这里了，希望以上内容可以对大家有一定的帮助，可以学到更多知识。如果觉得文章不错，可以把它分享出去让更多的人看到。
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