新手学LVM扩容-----给虚拟机添加空间

本来有台上面配置好CACTI的监控服务的虚拟机，一直是用来监控现在的服务器，这天连接上去，才发现这台机器当时是自己在本机上玩的，没想到会用在真实工作环境下，现在空间快不够了，需要给这台虚拟机扩下容量了，可是在线扩容我还真没高过，没办法，在弄台虚拟机来玩玩。[root@localhost ~]# df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
                       6983168   2253172   4369548 35% /
/dev/sda1               101086     12056     83811 13% /boot
tmpfs                   257668         0    257668   0% /dev/shm
[root@localhost ~]# fdisk -lDisk /dev/sda: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes   Device Boot      Start         End      Blocks   Id System
/dev/sda1   *           1          13      104391   83 Linux
/dev/sda2              14        1044     8281507+ 8e Linux LVMDisk /dev/sdb: 1073 MB, 1073741824 bytes
255 heads, 63 sectors/track, 130 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytesDisk /dev/sdb doesn"t contain a valid partition table
上面是本机现在的清况，下面开始创建物理卷[root@localhost ~]# pvcreate /dev/sdb
Physical volume "/dev/sdb" successfully created
[root@localhost ~]# pvdisplay                    ##可以用“pvdisplay”命令查看物理卷情况
--- Physical volume ---
PV Name               /dev/sda2
VG Name               VolGroup00
PV Size               7.90 GB / not usable 23.41 MB
Allocatable           yes （but full）
PE Size （KByte）       32768
Total PE              252
Free PE               0
Allocated PE          252
PV UUID               Up0jiK-5I0E-d5J5-wZSu-WIhX-aKRA-OR9Pjm

"/dev/sdb" is a new physical volume of "1.00 GB"               ###新建的物理卷
--- NEW Physical volume ---
PV Name               /dev/sdb
VG Name
PV Size               1.00 GB
Allocatable           NO
PE Size （KByte）       0
Total PE              0
Free PE               0
Allocated PE          0
PV UUID               zkullQ-PgoI-fHH4-xL3K-VLGm-JgMr-T7R1oA
下面就是将新添的物理卷加入到已有的逻辑卷组中[root@localhost ~]# vgextend /dev/VolGroup00 /dev/sdb
/dev/cdrom: 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 [root@localhost ~]# vgdisplay                ##查看卷组的空间
--- 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               8.84 GB
PE Size               32.00 MB
Total PE              283
Alloc PE / Size       252 / 7.88 GB                      ###原有的
Free PE / Size       31 / 992.00 MB                    ##新加的扩容进去的空间
VG UUID               0q4Uy2-coR3-bLwU-izpJ-kLOC-PxO3-9Efm8H
   ###############################################################[root@localhost ~]# lvdisplay                                               查看下分区
--- Logical volume ---
LV Name                /dev/VolGroup00/LogVol00
VG Name                VolGroup00
LV UUID                DDmERv-LIlu-cwXR-oM9t-33wj-l2ko-zw715W
LV Write Access        read/write
LV Status              available
# open                 1
LV Size                6.88 GB
Current LE             220
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                e0uO3o-HHrl-LFD1-iy3j-GSQc-U5mM-Q0GU4F
LV Write Access        read/write
LV Status              available
# open                 1
LV Size                1.00 GB
Current LE             32
Segments               1
Allocation             inherit
Read ahead sectors     auto
- currently set to     256
Block device           253:1

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