lvm扩容根分区

[align=left]1、查看系统挂载[/align]
# df -h

Filesystem Size Used Avail Use% Mounted on

/dev/mapper/VolGroup-lv_root 7.9G 938M 6.6G 13% /

tmpfs 497M 0 497M 0% /dev/shm

/dev/sda1 485M 30M 430M 7% /boot

/dev/mapper/VolGroup-LogVol02 4.0G 136M 3.7G 4% /home

/dev/mapper/VolGroup-LogVol03 3.6G 72M 3.3G 3% /opt
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[align=left]2、缩小/home分区，划分1G到根分区[/align]
[align=left]a、[/align]
# e2fsck -f /dev/VolGroup/LogVol02
e2fsck 1.41.12 (17-May-2010)

Pass 1: Checking inodes, blocks, and sizes

Pass 2: Checking directory structure

Pass 3: Checking directory connectivity

Pass 4: Checking reference counts

Pass 5: Checking group summary information

/dev/VolGroup/LogVol02: 11/262144 files (0.0% non-contiguous), 51278/1048576 blocks
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[align=left]b、[/align]
# resize2fs /dev/VolGroup/LogVol02 3092M

resize2fs 1.41.12 (17-May-2010)

Resizing the filesystem on /dev/VolGroup/LogVol02 to 791552 (4k) blocks.

The filesystem on /dev/VolGroup/LogVol02 is now 791552 blocks long.
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[align=left]c、[/align]
# lvresize -L 3092M /dev/VolGroup/LogVol02

WARNING: Reducing active logical volume to 3.02 GiB

THIS MAY DESTROY YOUR DATA (filesystem etc.)

Do you really want to reduce LogVol02? [y/n]: y
Reducing logical volume LogVol02 to 3.02 GiB

Logical volume LogVol02 successfully resized
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[align=left]3、再次查看系统状态[/align]
[align=left]a、[/align]
# df -h

Filesystem Size Used Avail Use% Mounted on

/dev/mapper/VolGroup-lv_root 7.9G 938M 6.6G 13% /

tmpfs 497M 0 497M 0% /dev/shm

/dev/sda1 485M 30M 430M 7% /boot

/dev/mapper/VolGroup-LogVol02 3.0G 134M 2.7G 5% /home

/dev/mapper/VolGroup-LogVol03 3.6G 72M 3.3G 3% /opt
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[align=left]b、[/align]
# vgdisplay

--- Volume group ---

VG Name VolGroup

System ID

Format lvm2

Metadata Areas 1

Metadata Sequence No 6

VG Access read/write

VG Status resizable

MAX LV 0

Cur LV 4

Open LV 4

Max PV 0

Cur PV 1

Act PV 1

VG Size 19.51 GiB

PE Size 4.00 MiB

Total PE 4994

Alloc PE / Size 4743 / 18.53 GiB

Free PE / Size 251 / 1004.00 MiB

VG UUID EV2q3Q-ugwW-GpnF-xcnU-CVz0-To2q-urZt9G
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注：其中的 && Free PE / Size 251 / 1004.00 MiB && 表示卷组中可分配空间
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[align=left]c、把可用空间添加到根分区[/align]
# lvextend -l +251 /dev/VolGroup/lv_root

Extending logical volume lv_root to 8.98 GiB

Logical volume lv_root successfully resized
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3、重启，系统光盘启动到救援模式；不要配置网络，不要让系统根挂载到/mnt/sysimage上，所以最后的界面选择“skip”





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[align=left]4、开始调整根分区文件系统[/align]
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[align=left]a、激活vg[/align]





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[align=left]b、查看激活状态[/align]





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[align=left]c、调整文件系统大小[/align]





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[align=left]d、确认修改[/align]
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# df -h

Filesystem Size Used Avail Use% Mounted on

/dev/mapper/VolGroup-lv_root 8.9G 938M 7.5G 11% /

tmpfs 497M 0 497M 0% /dev/shm

/dev/sda1 485M 30M 430M 7% /boot

/dev/mapper/VolGroup-LogVol02 3.0G 134M 2.7G 5% /home

/dev/mapper/VolGroup-LogVol03 3.6G 72M 3.3G 3% /opt
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# vgdisplay

--- Volume group ---

VG Name VolGroup

System ID

Format lvm2

Metadata Areas 1

Metadata Sequence No 7

VG Access read/write

VG Status resizable

MAX LV 0

Cur LV 4

Open LV 4

Max PV 0

Cur PV 1

Act PV 1

VG Size 19.51 GiB

PE Size 4.00 MiB

Total PE 4994

Alloc PE / Size 4994 / 19.51 GiB

Free PE / Size 0 / 0

VG UUID EV2q3Q-ugwW-GpnF-xcnU-CVz0-To2q-urZt9G
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本文出自 “no brothers,no linux” 博客，请务必保留此出处http://tonychiu.blog.51cto.com/656605/1109528