lvm下扩展根分区-第二块硬盘

 环境：vmware workstation 8

       centos 6.0

       第一块10G，swap占用2G

       现 / 分区空间不够，再添加了一块10G硬盘

 步骤：

1、格式化第二块硬盘，全部分为一个区，磁盘格式改为8e

Disk /dev/sdb: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x45c5ab54

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1        1305    10482381   8e  Linux LVM
# partprobe  /dev/sdb

2、添加到lvm

[root@ecdata ~]# pvcreate /dev/sdb1
  Physical volume "/dev/sdb1" successfully created

[root@ecdata ~]# vgdisplay
  --- Volume group ---
  VG Name               VolGroup
  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               9.51 GiB
  PE Size               4.00 MiB
  Total PE              2434
  Alloc PE / Size       2434 / 9.51 GiB
  Free  PE / Size       0 / 0
  VG UUID               EHdmVd-d3aD-GLFn-GfYn-tBgm-8JEk-dlUxgW

[root@ecdata ~]# vgextend VolGroup /dev/sdb1
  Volume group "VolGroup" successfully extended

[root@ecdata ~]# vgdisplay
  --- Volume group ---
  VG Name               VolGroup
  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               19.50 GiB
  PE Size               4.00 MiB
  Total PE              4992
  Alloc PE / Size       2434 / 9.51 GiB
  Free  PE / Size       2558 / 9.99 GiB
  VG UUID               EHdmVd-d3aD-GLFn-GfYn-tBgm-8JEk-dlUxgW

[root@ecdata ~]# mount
/dev/mapper/VolGroup-lv_root on / type ext4 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw)
/dev/sda1 on /boot type ext4 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)

[root@ecdata ~]# lvextend -l +2558 /dev/VolGroup/lv_root
  Extending logical volume lv_root to 17.53 GiB
  Logical volume lv_root successfully resized
[root@ecdata ~]# umount /
umount: /: device is busy.
        (In some cases useful info about processes that use
         the device is found by lsof(8) or fuser(1))

[root@ecdata ~]# e2fsck -f /dev/VolGroup/lv_root
e2fsck 1.41.12 (17-May-2010)
/dev/VolGroup/lv_root is mounted.

WARNING!!!  The filesystem is mounted.   If you continue you ***WILL***
cause ***SEVERE*** filesystem damage.

Do you really want to continue (y/n)? yes

/dev/VolGroup/lv_root: recovering journal

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/lv_root: ***** FILE SYSTEM WAS MODIFIED *****
/dev/VolGroup/lv_root: ***** REBOOT LINUX *****
/dev/VolGroup/lv_root: 45265/494832 files (0.1% non-contiguous), 311135/1976320 blocks

[root@ecdata ~]# resize2fs /dev/VolGroup/lv_root
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/VolGroup/lv_root is mounted on /; on-line resizing required
old desc_blocks = 1, new_desc_blocks = 2
Performing an on-line resize of /dev/VolGroup/lv_root to 4595712 (4k) blocks.
The filesystem on /dev/VolGroup/lv_root is now 4595712 blocks long.

[root@ecdata ~]# lvdisplay
  --- Logical volume ---
  LV Name                /dev/VolGroup/lv_root
  VG Name                VolGroup
  LV UUID                1mralq-VrIX-cBmW-YtRh-9JZN-f9s1-S3e22k
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                17.53 GiB
  Current LE             4488
  Segments               2
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

  --- Logical volume ---
  LV Name                /dev/VolGroup/lv_swap
  VG Name                VolGroup
  LV UUID                ibqsE8-6ktx-PBE8-rqIC-VCcq-R2pS-Jlf0zr
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                1.97 GiB
  Current LE             504
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1

[root@ecdata ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
                       18G  1.1G   16G   7% /
tmpfs                 497M     0  497M   0% /dev/shm
/dev/sda1             485M   30M  430M   7% /boot
[root@ecdata ~]#

 针对有失败的朋友，请查看http://tonychiu.blog.51cto.com/656605/1109528