扩展LV

LVM最大的特性就是可以弹性调整磁盘容量
下面扩展一个已经存在的LV
[root@ol6-121-rac1 mnt]# lvdisplay 
  --- Logical volume ---
  LV Path                /dev/vg_ol6121rac1/lv_root
  LV Name                lv_root
  VG Name                vg_ol6121rac1
  LV UUID                dahhMU-zPic-pKVq-3fan-YPCb-PlA6-JeWqe2
  LV Write Access        read/write
  LV Creation host, time ol6-121-rac1.localdomain, 2014-03-17 12:00:59 +0800
  LV Status              available
  # open                 1
  LV Size                9.54 GiB
  Current LE             2442
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:0
   
  --- Logical volume ---
  LV Path                /dev/vg_ol6121rac1/lv_swap
  LV Name                lv_swap
  VG Name                vg_ol6121rac1
  LV UUID                W3DHZp-o2wE-e49m-VJy0-4CYh-ZcMn-CRrtPf
  LV Write Access        read/write
  LV Creation host, time ol6-121-rac1.localdomain, 2014-03-17 12:01:01 +0800
  LV Status              available
  # open                 2
  LV Size                1.97 GiB
  Current LE             504
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:1
[root@ol6-121-rac1 mnt]# 
扩展VG
[root@ol6-121-rac1 mnt]# vgextend vg_ol6121rac1 /dev/sdb{1,2}     

  Volume group "vg_ol6121rac1" successfully extended
[root@ol6-121-rac1 mnt]# vgdisplay 
  --- Volume group ---
  VG Name               vg_ol6121rac1
  System ID             
  Format                lvm2
  Metadata Areas        3
  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                3
  Act PV                3
  VG Size               21.50 GiB
  PE Size               4.00 MiB
  Total PE              5504
  Alloc PE / Size       2946 / 11.51 GiB
  Free  PE / Size       2558 / 9.99 GiB
  VG UUID               5S3HpA-qT3U-ZSt7-AUZf-DUVs-oTAf-xByhje
   
[root@ol6-121-rac1 mnt]# pvdisplay 
  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               vg_ol6121rac1
  PV Size               11.51 GiB / not usable 3.00 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              2946
  Free PE               0
  Allocated PE          2946
  PV UUID               YEG40A-wEWW-9F8Z-bgcL-PWvA-7sef-FP12my
   
  --- Physical volume ---
  PV Name               /dev/sdb1
  VG Name               vg_ol6121rac1
  PV Size               5.01 GiB / not usable 2.10 MiB
  Allocatable           yes 
  PE Size               4.00 MiB
  Total PE              1282
  Free PE               1282
  Allocated PE          0
  PV UUID               p2nXS7-MmpX-Pawj-ThU3-k1NQ-t5Rc-hqKtb4
   
  --- Physical volume ---
  PV Name               /dev/sdb2
  VG Name               vg_ol6121rac1
  PV Size               4.99 GiB / not usable 2.60 MiB
  Allocatable           yes 
  PE Size               4.00 MiB
  Total PE              1276
  Free PE               1276
  Allocated PE          0
  PV UUID               M31k1o-JGJx-3OrN-DmNf-W8uJ-SXBB-JdSviW
   
[root@ol6-121-rac1 mnt]# 
扩展LV
[root@ol6-121-rac1 mnt]# lvresize -L +9.99G /dev/
Display all 183 possibilities? (y or n)
[root@ol6-121-rac1 mnt]# lvresize -L +9.99G /dev/vg
vga_arbiter    vg_ol6121rac1/ 
[root@ol6-121-rac1 mnt]# lvresize -L +9.99G /dev/vg_ol6121rac1/lv_root 
  Rounding size to boundary between physical extents: 9.99 GiB
  Extending logical volume lv_root to 19.53 GiB
  Logical volume lv_root successfully resized
[root@ol6-121-rac1 mnt]# 
[root@ol6-121-rac1 mnt]# 
[root@ol6-121-rac1 mnt]# 
[root@ol6-121-rac1 mnt]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_ol6121rac1-lv_root
                      9.4G  3.9G  5.1G  44% /
tmpfs                 499M  100K  499M   1% /dev/shm
/dev/sda1             485M   55M  405M  12% /boot
/dev/sr0              3.5G  3.5G     0 100% /media/OL6.4 x86_64 Disc 1 20130225
[root@ol6-121-rac1 mnt]# lvdisplay 
  --- Logical volume ---
  LV Path                /dev/vg_ol6121rac1/lv_root
  LV Name                lv_root
  VG Name                vg_ol6121rac1
  LV UUID                dahhMU-zPic-pKVq-3fan-YPCb-PlA6-JeWqe2
  LV Write Access        read/write
  LV Creation host, time ol6-121-rac1.localdomain, 2014-03-17 12:00:59 +0800
  LV Status              available
  # open                 1
  LV Size                19.53 GiB
  Current LE             5000
  Segments               3
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:0
   
  --- Logical volume ---
  LV Path                /dev/vg_ol6121rac1/lv_swap
  LV Name                lv_swap
  VG Name                vg_ol6121rac1
  LV UUID                W3DHZp-o2wE-e49m-VJy0-4CYh-ZcMn-CRrtPf
  LV Write Access        read/write
  LV Creation host, time ol6-121-rac1.localdomain, 2014-03-17 12:01:01 +0800
  LV Status              available
  # open                 2
  LV Size                1.97 GiB
  Current LE             504
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:1
   
完整的讲LV扩充到整个文件系统
[root@ol6-121-rac1 mnt]# resize2fs /dev/vg_ol6121rac1/lv_root 
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/vg_ol6121rac1/lv_root is mounted on /; on-line resizing required
old desc_blocks = 1, new_desc_blocks = 2
Performing an on-line resize of /dev/vg_ol6121rac1/lv_root to 5120000 (4k) blocks.
The filesystem on /dev/vg_ol6121rac1/lv_root is now 5120000 blocks long.

[root@ol6-121-rac1 mnt]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_ol6121rac1-lv_root
                       20G  3.9G   15G  22% /
tmpfs                 499M  100K  499M   1% /dev/shm
/dev/sda1             485M   55M  405M  12% /boot
/dev/sr0              3.5G  3.5G     0 100% /media/OL6.4 x86_64 Disc 1 20130225