当在linux下编辑某个文件时出现file systems full时，可以用df命令查看磁盘空间使用情况

如果挂载点/的已用%占了100%了，那么就表示/目录(根目录)下已经没有空间了，解决方案：

a.可以考虑把一些.tar包之类的或者上传的压缩包删除掉

b.增加一个虚拟硬盘

操作步骤：

首先，把虚拟机关掉

其次，虚拟机-设置-硬盘sisi-点击添加，去增加硬盘空间

最后，用[root@localhost ~]# fdisk -l 去查看PV NAME(物理卷)的名称，用fdisk -l可能会出现多个pv name(如果之前有增加过虚拟硬盘),可以通过PV size，知道是哪个pv name，这里的pv size就是刚才你增加虚拟硬盘的大小

接着就按照下面的方法一步一步操作

1.查看物理卷

[root@localhost ~]# pvdisplay  //Physical Volume

--- Physical volume ---

PV Name               /dev/sda2

VG Name               VolGroup00

PV Size               3.90 GB / not usable 24.72 MB

Allocatable           yes (but full)

PE Size (KByte)       32768

Total PE              124

Free PE               0

Allocated PE          124

PV UUID               jmRsdv-T0Z5-f0r6-A947-voXX-VGu0-iP60L2

2.将新的磁盘加到物理卷组里面

[root@localhost ~]# pvcreate /dev/sdb  //这个就是通过fdisk -l查到的pv name

Physical volume "/dev/sdb" successfully created

[root@localhost ~]# pvdisplay

--- Physical volume ---

PV Name               /dev/sda2

VG Name               VolGroup00

PV Size               3.90 GB / not usable 24.72 MB

Allocatable           yes (but full)

PE Size (KByte)       32768

Total PE              124

Free PE               0

Allocated PE          124

PV UUID               jmRsdv-T0Z5-f0r6-A947-voXX-VGu0-iP60L2

"/dev/sdb" is a new physical volume of "3.00 GB"

--- NEW Physical volume ---

PV Name               /dev/sdb

VG Name

PV Size               3.00 GB

Allocatable           NO

PE Size (KByte)       0

Total PE              0

Free PE               0

Allocated PE          0

PV UUID               W5ps21-bKeY-DIw0-FH1K-rVKV-ChwX-1nVzVB

3.查看逻辑卷组//卷组--------VG(Volumn Group)

[root@localhost ~]# 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               3.88 GB

PE Size               32.00 MB

Total PE              124

Alloc PE / Size       124 / 3.88 GB

Free  PE / Size       0 / 0

VG UUID               7Ar3kU-bSbp-8yrF-3Oo3-vkSE-NDLX-10L0ZI

4.将新增的物理卷 加到卷组里面

[root@localhost ~]# vgextend VolGroup00 /dev/sdb

[root@localhost ~]# vgdisplay

--- Volume group ---

VG Name               VolGroup00

System ID

Format                lvm2

Metadata Areas        2

Metadata Sequence No  4

VG Access             read/write

VG Status             resizable

MAX LV                0

Cur LV                2

Open LV               2

Max PV                0

Cur PV                2

Act PV                2

VG Size               6.84 GB

PE Size               32.00 MB

Total PE              219

Alloc PE / Size       124 / 3.88 GB

Free  PE / Size       95 / 2.97 GB

VG UUID               7Ar3kU-bSbp-8yrF-3Oo3-vkSE-NDLX-10L0ZI

这时候看到 逻辑卷组的VG size 已经变成 6.84G了

5.扩展逻辑卷的大小

先df -h 看看 是哪个逻辑卷需要扩容

[root@localhost ~]# df -h

文件系统              容量  已用 可用 已用% 挂载点

/dev/mapper/VolGroup00-LogVol00

3.3G  3.3G     0 100% /

/dev/sda1              99M   12M   82M  13% /boot

tmpfs                 125M     0  125M   0% /dev/shm

/dev/hdc              3.8G  3.8G     0 100% /media/CentOS_5.4_Final

“/”分区满了，对应的设备是/dev/mapper/VolGroup00-LogVol00

lvdisplay查看对应的逻辑卷名

[root@localhost ~]# lvdisplay //逻辑卷-----LV(Logical Volume)

--- Logical volume ---

LV Name                /dev/VolGroup00/LogVol00

VG Name                VolGroup00

LV UUID                ToqjmS-XzO8-Sas0-Bj5d-QCbX-9T8b-83DTNS

LV Write Access        read/write

LV Status              available

# open                 1

LV Size                3.38 GB

Current LE             108

Segments               1

Allocation             inherit

Read ahead sectors     auto

- currently set to     256

Block device           253:0

--- Logical volume ---

LV Name                /dev/VolGroup00/LogVol01

VG Name                VolGroup00

LV UUID                gC6Qfo-BgM1-7YC0-9qvB-Z7XT-icjZ-vmFAqq

LV Write Access        read/write

LV Status              available

# open                 1

LV Size                512.00 MB

Current LE             16

Segments               1

Allocation             inherit

Read ahead sectors     auto

- currently set to     256

Block device           253:1

需要扩容的逻辑卷是/dev/VolGroup00/LogVol00 增加1G 就是自已另外增加的虚拟硬盘大小

[root@localhost ~]# lvextend -L +1G /dev/VolGroup00/LogVol00

Rounding up size to full physical extent 1.97 GB

Extending logical volume LogVol00 to 5.34 GB

让上面的扩容生效~

[root@localhost ~]# resize2fs /dev/VolGroup00/LogVol00

resize2fs 1.39 (29-May-2006)

Filesystem at /dev/VolGroup00/LogVol00 is mounted on /; on-line resizing required

Performing an on-line resize of /dev/VolGroup00/LogVol00 to 1400832 (4k) blocks.

The filesystem on /dev/VolGroup00/LogVol00 is now 1400832 blocks long.

[root@localhost ~]# df -h

文件系统              容量  已用 可用 已用% 挂载点

/dev/mapper/VolGroup00-LogVol00

5.2G  3.3G  1.7G  66% /

/dev/sda1              99M   12M   82M  13% /boot

tmpfs                 125M     0  125M   0% /dev/shm

现在看到 “/” 大小已经变成5.2G了

========================================================

如何创建新的逻辑卷，并把加入的硬盘划入此卷。

[root@localhost ~]# lvcreate -L 2000 -n LogVoloo102

[root@root-pc /]# mkfs -t ext3 /dev/VolGroup00/LogVoo102[root@root-pc /]# mount /dev/VolGroup00/LogVoo102 /oa_app/[root@root-pc ~]# df -h文件系统              容量  已用 可用 已用% 挂载点/dev/mapper/VolGroup00-LogVol00                       19G  3.0G   15G  17% //dev/sda1              99M   12M   82M  13% /boottmpfs                 252M     0  252M   0% /dev/shm/dev/mapper/VolGroup00-LogVoo102                      2.0G   35M  1.9G   2% /oa_app