lvm收縮邏輯卷空間

[root@cspserver1 /]#  umount /softdata
[root@cspserver1 /]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/RHELVG-ROOT
                       15G   12G  2.6G  82% /
tmpfs                  16G  7.8G  8.0G  50% /dev/shm
/dev/sda1             190M   40M  141M  23% /boot
/dev/mapper/RHELVG-HOME
                       20G   55M   19G   1% /home
/dev/mapper/RHELVG-OPT
                       15G   13G  1.2G  92% /opt
/dev/mapper/RHELVG-TMP
                       15G   44M   14G   1% /tmp
/dev/mapper/RHELVG-USR
                       15G  3.8G   11G  28% /usr
/dev/mapper/RHELVG-VAR
                       15G  261M   14G   2% /var

[root@cspserver1 /]# e2fsck -f /dev/mapper/RHELVG-SOFTDATA
e2fsck 1.41.12 (17-May-2010)
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/mapper/RHELVG-SOFTDATA: 11/2559088 files (0.0% non-contiguous), 205643/10232832 blocks
[root@cspserver1 /]# resize2fs /dev/mapper/RHELVG-SOFTDATA 10240m   （檔案系統縮到10g）
resize2fs 1.41.12 (17-May-2010)
Resizing the filesystem on /dev/mapper/RHELVG-SOFTDATA to 2621440 (4k) blocks.
The filesystem on /dev/mapper/RHELVG-SOFTDATA is now 2621440 blocks long.

is already 2621440 blocks long.  Nothing to do!

[root@cspserver1 /]# lvreduce -L 10240m /dev/mapper/RHELVG-SOFTDATA    （再縮lv）
  WARNING: Reducing active logical volume to 10.00 GiB.
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce RHELVG/SOFTDATA? [y/n]: y
  Size of logical volume RHELVG/SOFTDATA changed from 39.04 GiB (9993 extents) to 10.00 GiB (2560 extents).
  Logical volume SOFTDATA successfully resized.
[root@cspserver1 /]# mount /dev/mapper/RHELVG-SOFTDATA /softdata
[root@cspserver1 /]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/RHELVG-ROOT
                       15G   12G  2.6G  82% /
tmpfs                  16G  7.8G  8.0G  50% /dev/shm
/dev/sda1             190M   40M  141M  23% /boot
/dev/mapper/RHELVG-HOME
                       20G   55M   19G   1% /home
/dev/mapper/RHELVG-OPT
                       15G   13G  1.2G  92% /opt
/dev/mapper/RHELVG-TMP
                       15G   44M   14G   1% /tmp
/dev/mapper/RHELVG-USR
                       15G  3.8G   11G  28% /usr
/dev/mapper/RHELVG-VAR
                       15G  261M   14G   2% /var
/dev/mapper/RHELVG-SOFTDATA
                      9.8G   36M  9.2G   1% /softdata
[root@cspserver1 /]# pvs
  PV         VG     Fmt  Attr PSize   PFree
  /dev/sda2  RHELVG lvm2 a--u 149.80g 29.04g
[root@cspserver1 /]# lvextend -L +20480M /dev/mapper/RHELVG-OPT  (擴充套件邏輯卷)
  Size of logical volume RHELVG/OPT changed from 15.00 GiB (3840 extents) to 35.00 GiB (8960 extents).
  Logical volume OPT successfully resized.
[root@cspserver1 /]# resize2fs /dev/mapper/RHELVG-OPT   （將擴充套件的邏輯卷同步到檔案系統）
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/mapper/RHELVG-OPT is mounted on /opt; on-line resizing required
old desc_blocks = 1, new_desc_blocks = 3
Performing an on-line resize of /dev/mapper/RHELVG-OPT to 9175040 (4k) blocks.
The filesystem on /dev/mapper/RHELVG-OPT is now 9175040 blocks long.

[root@cspserver1 /]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/RHELVG-ROOT
                       15G   12G  2.6G  82% /
tmpfs                  16G  7.8G  8.0G  50% /dev/shm
/dev/sda1             190M   40M  141M  23% /boot
/dev/mapper/RHELVG-HOME
                       20G   55M   19G   1% /home
/dev/mapper/RHELVG-OPT
                       35G   13G   20G  40% /opt
/dev/mapper/RHELVG-TMP
                       15G   44M   14G   1% /tmp
/dev/mapper/RHELVG-USR
                       15G  3.8G   11G  28% /usr
/dev/mapper/RHELVG-VAR
                       15G  261M   14G   2% /var
/dev/mapper/RHELVG-SOFTDATA
                      9.8G   36M  9.2G   1% /softdata
[root@cspserver1 /]#