grow lvm file system and shrink lvm file system

[1]Shrink LVM File System
[2]Grow LVM File System

<h4>收缩分区空间</h4>

初始时候磁盘分区情况，/var/lib/nova/instances分区挂载在lv上,查看磁盘分区和lv信息。

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root@glos-manager:~# df -h
Filesystem                                   Size  Used Avail Use% Mounted on
/dev/mapper/cinder--volumes-system--root     3.7G  990M  2.6G  28% /
udev                                         993M  4.0K  993M   1% /dev
tmpfs                                        401M  352K  401M   1% /run
none                                         5.0M     0  5.0M   0% /run/lock
none                                        1002M     0 1002M   0% /run/shm
/dev/sda1                                    184M   31M  145M  18% /boot
/dev/sda3                                    939M   18M  875M   2% /home
/dev/sda2                                    939M  524M  368M  59% /usr
/dev/mapper/cinder--volumes-nova--instances  2.2G   68M  2.1G   4% /var/lib/nova/instances

root@glos-manager:~# lvdisplay
  --- Logical volume ---
  LV Name                /dev/cinder-volumes/nova-instances
  VG Name                cinder-volumes
  LV UUID                IQCf3L-Zebu-CfrD-H5ct-qlg6-DnTI-SaQWef
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                2.22 GiB
  Current LE             568
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:0

  --- Logical volume ---
  LV Name                /dev/cinder-volumes/system-root
  VG Name                cinder-volumes
  LV UUID                XVAGEN-Orq2-OnRI-FXvY-G3yd-dRiE-JdDlmw
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                3.73 GiB
  Current LE             954
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:1

缩小lv的空间。

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umount /var/lib/nova/instances
e2fsck -f /dev/mapper/cinder--volumes-nova--instances
resize2fs /dev/mapper/cinder--volumes-nova--instances 1500M
lvresize -L 1.5G /dev/cinder-volumes/nova-instances
mount /dev/mapper/cinder--volumes-nova--instances /var/lib/nova/instances

查看缩小后的lv信息和磁盘分区情况。

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root@glos-manager:/# lvdisplay
  --- Logical volume ---
  LV Name                /dev/cinder-volumes/nova-instances
  VG Name                cinder-volumes
  LV UUID                IQCf3L-Zebu-CfrD-H5ct-qlg6-DnTI-SaQWef
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                1.50 GiB
  Current LE             384
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:0

  --- Logical volume ---
  LV Name                /dev/cinder-volumes/system-root
  VG Name                cinder-volumes
  LV UUID                XVAGEN-Orq2-OnRI-FXvY-G3yd-dRiE-JdDlmw
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                3.73 GiB
  Current LE             954
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:1

root@glos-manager:/# mount /dev/mapper/cinder--volumes-nova--instances /var/lib/nova/instances
root@glos-manager:/# df -h
Filesystem                                   Size  Used Avail Use% Mounted on
/dev/mapper/cinder--volumes-system--root     3.7G  990M  2.6G  28% /
udev                                         993M  4.0K  993M   1% /dev
tmpfs                                        401M  352K  401M   1% /run
none                                         5.0M     0  5.0M   0% /run/lock
none                                        1002M     0 1002M   0% /run/shm
/dev/sda1                                    184M   31M  145M  18% /boot
/dev/sda3                                    939M   18M  875M   2% /home
/dev/sda2                                    939M  524M  368M  59% /usr
/dev/mapper/cinder--volumes-nova--instances  1.5G   68M  1.4G   5% /var/lib/nova/instances

<h4>扩展分区空间</h4>

查看磁盘分区情况和lv信息。

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root@glos-manager:/# lvdisplay
  --- Logical volume ---
  LV Name                /dev/cinder-volumes/nova-instances
  VG Name                cinder-volumes
  LV UUID                IQCf3L-Zebu-CfrD-H5ct-qlg6-DnTI-SaQWef
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                1.50 GiB
  Current LE             384
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:0

  --- Logical volume ---
  LV Name                /dev/cinder-volumes/system-root
  VG Name                cinder-volumes
  LV UUID                XVAGEN-Orq2-OnRI-FXvY-G3yd-dRiE-JdDlmw
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                3.73 GiB
  Current LE             954
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:1

root@glos-manager:/# df -kh
Filesystem                                   Size  Used Avail Use% Mounted on
/dev/mapper/cinder--volumes-system--root     3.7G  990M  2.6G  28% /
udev                                         993M  4.0K  993M   1% /dev
tmpfs                                        401M  352K  401M   1% /run
none                                         5.0M     0  5.0M   0% /run/lock
none                                        1002M     0 1002M   0% /run/shm
/dev/sda1                                    184M   31M  145M  18% /boot
/dev/sda3                                    939M   18M  875M   2% /home
/dev/sda2                                    939M  524M  368M  59% /usr
/dev/mapper/cinder--volumes-nova--instances  1.5G   68M  1.4G   5% /var/lib/nova/instances

查看volume group的空间使用情况。

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root@glos-manager:/# vgdisplay cinder-volumes
  --- Volume group ---
  VG Name               cinder-volumes
  System ID
  Format                lvm2
  Metadata Areas        1
  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                1
  Act PV                1
  VG Size               5.95 GiB
  PE Size               4.00 MiB
  Total PE              1522
  Alloc PE / Size       1338 / 5.23 GiB
  Free  PE / Size       184 / 736.00 MiB
  VG UUID               EIKfKf-mIvG-Sabt-JlV4-19Ot-XqSK-3dEXE0

还有700+MB可用，分配500MB到/var/lib/nova/instances空间。

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root@glos-manager:/# lvresize -L +500MB /dev/cinder-volumes/nova-instances
  Extending logical volume nova-instances to 1.99 GiB
  Logical volume nova-instances successfully resized

查看LV信息。

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root@glos-manager:/# lvdisplay
  --- Logical volume ---
  LV Name                /dev/cinder-volumes/nova-instances
  VG Name                cinder-volumes
  LV UUID                IQCf3L-Zebu-CfrD-H5ct-qlg6-DnTI-SaQWef
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                1.99 GiB
  Current LE             509
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:0

  --- Logical volume ---
  LV Name                /dev/cinder-volumes/system-root
  VG Name                cinder-volumes
  LV UUID                XVAGEN-Orq2-OnRI-FXvY-G3yd-dRiE-JdDlmw
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                3.73 GiB
  Current LE             954
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:1

查看磁盘分区情况。

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root@glos-manager:/# df -h
Filesystem                                   Size  Used Avail Use% Mounted on
/dev/mapper/cinder--volumes-system--root     3.7G  990M  2.6G  28% /
udev                                         993M  4.0K  993M   1% /dev
tmpfs                                        401M  352K  401M   1% /run
none                                         5.0M     0  5.0M   0% /run/lock
none                                        1002M     0 1002M   0% /run/shm
/dev/sda1                                    184M   31M  145M  18% /boot
/dev/sda3                                    939M   18M  875M   2% /home
/dev/sda2                                    939M  524M  368M  59% /usr
/dev/mapper/cinder--volumes-nova--instances  1.5G   68M  1.4G   5% /var/lib/nova/instances

instances分区依然保留原来1.5G分区，还需要对instances做扩展。

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root@glos-manager:/# resize2fs -p /dev/mapper/cinder--volumes-nova--instances
resize2fs 1.42 (29-Nov-2011)
Filesystem at /dev/mapper/cinder--volumes-nova--instances is mounted on /var/lib/nova/instances; on-line resizing required
old_desc_blocks = 1, new_desc_blocks = 1
Performing an on-line resize of /dev/mapper/cinder--volumes-nova--instances to 521216 (4k) blocks.
The filesystem on /dev/mapper/cinder--volumes-nova--instances is now 521216 blocks long.

查看扩展后的效果。

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root@glos-manager:/# df -h
Filesystem                                   Size  Used Avail Use% Mounted on
/dev/mapper/cinder--volumes-system--root     3.7G  990M  2.6G  28% /
udev                                         993M  4.0K  993M   1% /dev
tmpfs                                        401M  352K  401M   1% /run
none                                         5.0M     0  5.0M   0% /run/lock
none                                        1002M     0 1002M   0% /run/shm
/dev/sda1                                    184M   31M  145M  18% /boot
/dev/sda3                                    939M   18M  875M   2% /home
/dev/sda2                                    939M  524M  368M  59% /usr
/dev/mapper/cinder--volumes-nova--instances  2.0G   68M  1.8G   4% /var/lib/nova/instances

参考资料：
[LVM Resizing Guide ]

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