[root@mysql1 ~]# mount
/dev/sda2 on / type ext3 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/mapper/mysql-maindb on /data2 type ext3 (rw,noatime)
/dev/sda1 on /boot type ext3 (rw)
tmpfs on /dev/shm type tmpfs (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
[root@mysql1 ~]# sha1sum /data2/
file1.img   lost+found/
[root@mysql1 ~]# sha1sum /data2/file1.img
4a7e96ad0c40e34f8b372490f4ebb6e19b47f83e  /data2/file1.img
[root@mysql1 ~]# umount /data2/
[root@mysql1 ~]# lvdisplay
  /dev/cdrom: open failed: No medium found
  --- Logical volume ---
  LV Name                /dev/mysql/maindb
  VG Name                mysql
  LV UUID                jT88H5-RRNr-pXFF-zRDF-ykmE-x2YK-0lpgTR
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                33.00 GB
  Current LE             8448
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

[root@mysql1 ~]# pvdisplay
  /dev/cdrom: open failed: No medium found
  --- Physical volume ---
  PV Name               /dev/sda5
  VG Name               mysql
  PV Size               68.13 GB / not usable 2.62 MB
  Allocatable           yes
  PE Size (KByte)       4096
  Total PE              17441
  Free PE               8993
  Allocated PE          8448
  PV UUID               M8wdtD-Ky6Y-m5IF-CIWe-YANi-vrSa-yQsaU0

[root@mysql1 ~]# vgdisplay
  /dev/cdrom: open failed: No medium found
  --- Volume group ---
  VG Name               mysql
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  2
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               0
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               68.13 GB
  PE Size               4.00 MB
  Total PE              17441
  Alloc PE / Size       8448 / 33.00 GB
  Free  PE / Size       8993 / 35.13 GB
  VG UUID               qfnBeg-fzTi-zIhh-DGq4-RlgV-YYhz-4JwjbB

[root@mysql1 ~]# mount
/dev/sda2 on / type ext3 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/sda1 on /boot type ext3 (rw)
tmpfs on /dev/shm type tmpfs (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
[root@mysql1 ~]# fsck -f /dev/mysql/maindb
fsck 1.39 (29-May-2006)
e2fsck 1.39 (29-May-2006)
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/mysql/maindb: 12/4325376 files (8.3% non-contiguous), 180805/8650752 blocks
[root@mysql1 ~]# lvextend -L+30G /dev/mysql/maindb
  /dev/cdrom: open failed: No medium found
  Extending logical volume maindb to 63.00 GB
  Logical volume maindb successfully resized
[root@mysql1 ~]# resize2fs /dev/mysql/maindb
resize2fs 1.39 (29-May-2006)
Resizing the filesystem on /dev/mysql/maindb to 16515072 (4k) blocks.
The filesystem on /dev/mysql/maindb is now 16515072 blocks long.

[root@mysql1 ~]# mount /dev/mysql/maindb
[root@mysql1 ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda2             9.5G  1.7G  7.4G  19% /
/dev/sda1              99M   18M   76M  20% /boot
tmpfs                1006M     0 1006M   0% /dev/shm
/dev/mapper/mysql-maindb
                       63G  180M   60G   1% /data2
[root@mysql1 ~]# lvdisplay
  /dev/cdrom: open failed: No medium found
  --- Logical volume ---
  LV Name                /dev/mysql/maindb
  VG Name                mysql
  LV UUID                jT88H5-RRNr-pXFF-zRDF-ykmE-x2YK-0lpgTR
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                63.00 GB
  Current LE             16128
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

[root@mysql1 ~]# vgdisplay
  /dev/cdrom: open failed: No medium found
  --- Volume group ---
  VG Name               mysql
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  3
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               1
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               68.13 GB
  PE Size               4.00 MB
  Total PE              17441
  Alloc PE / Size       16128 / 63.00 GB
  Free  PE / Size       1313 / 5.13 GB
  VG UUID               qfnBeg-fzTi-zIhh-DGq4-RlgV-YYhz-4JwjbB