virtualbox中redhat5扩展根分区

在虚拟机中，linux总是遇到使用过程中根分区空间不够的情况，可以按照下面的步骤扩展根分区。
关闭虚拟机，扩展磁盘到20g

D:\VirtualBox>VBoxManage.exe modifyhd "D:\VirtualBox VMs\rac1\rac1.vdi" --resize 215040%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%

开启虚拟机

[root@rac1 ~]# fdisk -lDisk /dev/sda: 22.5 GB, 22548578304 bytes255 heads, 63 sectors/track, 2741 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytes   Device Boot      Start         End      Blocks   Id  System/dev/sda1   *           1          13      104391   83  Linux/dev/sda2              14        2088    16667437+  8e  Linux LVM

看到新添加的磁盘空间已经加进来了，但是还没有被使用，

fdisk /dev/sda创建新的分区[root@rac1 ~]# fdisk -l /dev/sdaDisk /dev/sda: 22.5 GB, 22548578304 bytes255 heads, 63 sectors/track, 2741 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytes   Device Boot      Start         End      Blocks   Id  System/dev/sda1   *           1          13      104391   83  Linux/dev/sda2              14        2088    16667437+  8e  Linux LVM/dev/sda4            2089        2741     5245222+  83  Linux

执行[root@rac1 ~]# partprobe 重新加载分区的信息，否则找不到新建的分区
mkfs.ext3 /dev/sda4
pvcreate /dev/sda4 创建物理卷
查看当前vg的信息
[root@rac1 ~]# vgdisplay
— Volume group —
VG Name VolGroup00
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 3
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 1
Act PV 1
VG Size 15.88 GB
PE Size 32.00 MB
Total PE 508
Alloc PE / Size 508 / 15.88 GB
Free PE / Size 0 / 0
VG UUID 5FmdTQ-PCtp-YLrH-thfM-hWRV-NhkD-gyIIei

扩展vg

root@rac1 ~]# vgextend VolGroup00 /dev/sda4  /dev/hdc: open failed: Read-only file system  /dev/cdrom: open failed: Read-only file system  Attempt to close device '/dev/cdrom' which is not open.  Volume group "VolGroup00" successfully extended

lvextend -L +4GB /dev/VolGroup00/LogVol00
resize2fs /dev/VolGroup00/LogVol00
df -h查看已经添加进来了