系統環境：RedHat 5.5 64bit

系統情況：採用作業系統預設分割槽（LV）

事件原由：擴充根分割槽大小

操作記錄：

[[email protected] ~]# fdisk /dev/sdb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.

The number of cylinders for this disk is set to 6527.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
   (e.g., DOS FDISK, OS/2 FDISK)
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-6527, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-6527, default 6527):
Using default value 6527

Command (m for help): p

Disk /dev/sdb: 53.6 GB, 53687091200 bytes
255 heads, 63 sectors/track, 6527 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1        6527    52428096   83  Linux

Command (m for help): t
Selected partition 1
Hex code (type L to list codes): 8e
Changed system type of partition 1 to 8e (Linux LVM)

Command (m for help): p

Disk /dev/sdb: 53.6 GB, 53687091200 bytes
255 heads, 63 sectors/track, 6527 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1        6527    52428096   8e  Linux LVM

Command (m for help): wq
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.
[[email protected] ~]#
[[email protected] ~]# pvcreate /dev/sdb1
  Physical volume "/dev/sdb1" successfully created
[[email protected] ~]# partprobe
[[email protected] ~]# vgdisplay
  /dev/hdc: open failed: No medium found
  --- Volume group ---
  VG Name               VolGroup00
  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               29.88 GB
  PE Size               32.00 MB
  Total PE              956
  Alloc PE / Size       956 / 29.88 GB
  Free  PE / Size       0 / 0  
  VG UUID               0W89dj-GEjI-ltiZ-k4Cp-LEYh-FUdc-5fTyde
  
[[email protected] ~]# vgextend VolGroup00 /dev/sdb1
  /dev/hdc: open failed: No medium found
  Volume group "VolGroup00" successfully extended
[[email protected] ~]# vgdisplay
  /dev/hdc: open failed: No medium found
  --- 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               79.84 GB
  PE Size               32.00 MB
  Total PE              2555
  Alloc PE / Size       956 / 29.88 GB
  Free  PE / Size       1599 / 49.97 GB
  VG UUID               0W89dj-GEjI-ltiZ-k4Cp-LEYh-FUdc-5fTyde
  
[[email protected] ~]# lvdisplay
  /dev/hdc: open failed: No medium found
  --- Logical volume ---
  LV Name                /dev/VolGroup00/LogVol00
  VG Name                VolGroup00
  LV UUID                t58TE3-DbHI-QUUs-Tlle-9gSK-gn9U-YZAJFL
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                20.12 GB
  Current LE             644
  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                4C8Tp1-rlhc-0P1E-oCEj-2V1b-Okan-weS2fm
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                9.75 GB
  Current LE             312
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1
  
[[email protected] ~]# lvresize -l +1599 /dev/VolGroup00/LogVol00
  /dev/hdc: open failed: No medium found
  Extending logical volume LogVol00 to 70.09 GB
  Logical volume LogVol00 successfully resized
[[email protected] ~]# 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 18374656 (4k) blocks.
The filesystem on /dev/VolGroup00/LogVol00 is now 18374656 blocks long.

[[email protected] ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
                       68G   14G   51G  22% /
/dev/sda1              99M   16M   78M  17% /boot
tmpfs                 3.9G  176M  3.8G   5% /dev/shm
[[email protected] ~]#