linux动态增加LV空间的方法

--这个是新添加的硬盘  
[root@localhost ~]# fdisk -l /dev/sdb  
Disk /dev/sdb: 5368 MB, 5368709120 bytes  
255 heads, 63 sectors/track, 652 cylinders  
Units = cylinders of 16065 * 512 = 8225280 bytes  
Disk /dev/sdb doesn't contain a valid partition table

--命令很简单  
[root@localhost ~]# pvcreate /dev/sdb  
Physical volume "/dev/sdb" successfully created  

--可以看到新的PV了  
[root@localhost ~]# pvdisplay  
/dev/hdc: open failed: No medium found  
--- Physical volume ---  
PV Name               /dev/sda2  
VG Name               VolGroup00  
PV Size               9.90 GB / not usable 22.76 MB  
Allocatable           yes (but full)  
PE Size (KByte)       32768  
Total PE              316  
Free PE               0  
Allocated PE          316  
PV UUID               n5fS6M-jBiH-n9vU-pBTd-iOCv-BbTe-BUeNZo  

"/dev/sdb" is a new physical volume of "5.00 GB"  
--- NEW Physical volume ---  
PV Name               /dev/sdb  
VG Name                 
PV Size               5.00 GB  
Allocatable           NO  
PE Size (KByte)       0  
Total PE              0  
Free PE               0  
Allocated PE          0  
PV UUID               TDs3mN-3ON3-eHbl-cohr-7Hr3-8608-jiLlXG  

--指定对应的VG和PV  
[root@localhost ~]# vgextend VolGroup00 /dev/sdb  
Volume group "VolGroup00" successfully extended  

--看到新的5G添加到VG里面了，状态是没有分配  
[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               14.84 GB  
PE Size               32.00 MB  
Total PE              475  
Alloc PE / Size       316 / 9.88 GB  
Free  PE / Size       159 / 4.97 GB  
VG UUID               x1uyPD-qBgE-2yQV-T1Cb-IGIz-e4LB-fghf1W  

--先添加2G练手  
[root@localhost ~]# lvextend -L +2G /dev/VolGroup00/LogVol00  
Extending logical volume LogVol00 to 10.88 GB  
Logical volume LogVol00 successfully resized  
--成功后还未看到新的空间  
[root@localhost ~]# df -m  
Filesystem           1M-blocks      Used Available Use% Mounted on  
/dev/mapper/VolGroup00-LogVol00  
8804      7362       988  89% /  
--需要手动刷新  
[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 2850816 (4k) blocks.  
The filesystem on /dev/VolGroup00/LogVol00 is now 2850816 blocks long.  

--现在就完成了  
[root@localhost ~]# df -m  
Filesystem           1M-blocks      Used Available Use% Mounted on  
/dev/mapper/VolGroup00-LogVol00  
10788      7365      2867  72% /