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 NameVolGroup00  
  PV Size9.90 GB / not usable 22.76 MB  
  Allocatable  yes (but full)  
  PE Size (KByte) 32768  
  Total PE  316  
  Free PE0  
  Allocated PE 316  
  PV UUIDn5fS6M-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 Size5.00 GB  
  Allocatable  NO  
  PE Size (KByte) 0  
  Total PE  0  
  Free PE0  
  Allocated PE 0  
  PV UUIDTDs3mN-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 NameVolGroup00  
  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 LV2  
  Max PV 0  
  Cur PV 2  
  Act PV 2  
  VG Size14.84 GB  
  PE Size32.00 MB  
  Total PE  475  
  Alloc PE / Size 316 / 9.88 GB  
  Free  PE / Size 159 / 4.97 GB  
  VG UUIDx1uyPD-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-blocksUsed Available Use% Mounted on  
/dev/mapper/VolGroup00-LogVol00 88047362 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-blocksUsed Available Use% Mounted on  
/dev/mapper/VolGroup00-LogVol001078873652867  72% /