KVM 虚拟机增加磁盘

54432 · 发表于 2014-6-27 17:29:53

                  背景：
   由于在KVM虚机上做glusterfs测试，发现KVM虚拟存储空间不够。
   思路：创建一个kvm img 文件指定大小200G，然后通过Virtual Machine Manager导入到对应的虚拟机
步骤：
这里以虚拟机vm2为例

创建kvm img
[iyunv@agent-cloudstack34 2]cd /d1/virtual_machine/vm/2  #进入虚机文件目录
[iyunv@agent-cloudstack34 2]# qemu-img create vm2-1.img 200G

Formatting 'vm2-1.img', fmt=raw size=214748364800  #创建成功
[iyunv@agent-cloudstack34 2]# ls
vm2-1.img  vm2.img
使用VMM导入文件
首先关闭vm2
单击finish 完成磁盘添加

IDE Disk2 就是新增的磁盘
启动vm2
新增磁盘格式化分区
[iyunv@localhost ~]# fdisk -l #查看系统磁盘

Disk /dev/sdb: 214.7 GB, 214748364800 bytes ---新增磁盘
255 heads, 63 sectors/track, 26108 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
....

[iyunv@localhost ~]# fdisk /dev/sdb #对新增磁盘分区
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0xc6997a54.
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 #打印当前磁盘信息

Disk /dev/sdb: 214.7 GB, 214748364800 bytes
255 heads, 63 sectors/track, 26108 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: 0xc6997a54

  Device Boot    Start       End    Blocks Id  System

Command (m for help): n #增加分区
Command action
e extended
p primary partition (1-4)
p    #
通常选择主分区，所以这里打一个p

Partition number (1-4): 1 #
因为是第一个分却，所以只选择1

First cylinder (1-26108, default 1): 26100G #填写分区大小 200G
Last cylinder, +cylinders or +size{K,M,G} (26100-26108, default 26108):
Using default value 26108

Command (m for help): w    #将分区写入硬盘
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.
格式化分区

[iyunv@localhost ~]# mkfs.ext4 /dev/sdb
mke2fs 1.41.12 (17-May-2010)
/dev/sdb is entire device, not just one partition!
Proceed anyway? (y,n) y
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
13107200 inodes, 52428800 blocks
2621440 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
1600 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, 1605632, 2654208,
      4096000, 7962624, 11239424, 20480000, 23887872

Writing inode tables: done
Creating journal (32768 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.
创建目录挂载分区
mkdir /d1

[iyunv@localhost ~]# mount /dev/sdb /d1
[iyunv@localhost ~]# df -h
Filesystem          Size  Used Avail Use% Mounted on
/dev/mapper/vg_livedvd-lv_root
                     20G  5.2G 15G  27% /
tmpfs                3.9G    0  3.9G 0% /dev/shm
/dev/sda1          485M 37M  423M 8% /boot
/dev/sdb             197G  188M  187G 1% /d1