centos根目录扩容

准备工作

添加一块新硬盘/dev/sdb

$ fdisk -l

Disk /dev/sdb: 1099.5 GB, 1099511627776 bytes
255 heads, 63 sectors/track, 133674 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: 0x00000000

查看当前更分区大小

$ df -h

Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
                       50G  3.6G   44G   8% /
tmpfs                 1.9G     0  1.9G   0% /dev/shm
/dev/sda1             477M   33M  419M   8% /boot
/dev/mapper/VolGroup-lv_home
                      5.5G   12M  5.2G   1% /home

格式化新硬盘

$ fdisk /dev/sdb 

Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0x070d6722.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
         switch off the mode (command 'c') and change display units to
         sectors (command 'u').

Command (m for help): n //创建新分区
Command action
   e   extended
   p   primary partition (1-4)
p  //创建为主分区
Partition number (1-4): 1 //分区号
First cylinder (1-133674, default 1): 
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-133674, default 133674): 
Using default value 133674

Command (m for help): t //设置分区为lvm, 因为根分区为lvm
Selected partition 1
Hex code (type L to list codes): 8e //lvm类型
Changed system type of partition 1 to 8e (Linux LVM)

Command (m for help): w //保存退出
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.

创建物理卷

$ pvcreate /dev/sdb1 

  Physical volume "/dev/sdb1" successfully created

查看当前卷组vgdisplay

$ vgdisplay 

  --- Volume group ---
  VG Name               VolGroup
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  4
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                3
  Open LV               3
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               59.51 GiB
  PE Size               4.00 MiB
  Total PE              15234
  Alloc PE / Size       15234 / 59.51 GiB
  Free  PE / Size       0 / 0   
  VG UUID               dUUORQ-j5l9-Jd4N-EFNl-N6Qc-rGWq-12QmMA

扩展卷组

$ lvextend -L +1023G /dev/VolGroup/lv_root 

  Size of logical volume VolGroup/lv_root changed from 50.00 GiB (12800 extents) to 1.05 TiB (274688 extents).
  Logical volume lv_root successfully resized

重置根分区容量

$ 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 = 4, new_desc_blocks = 68
Performing an on-line resize of /dev/VolGroup/lv_root to 281280512 (4k) blocks.

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