Centos 6.5 64-bit, adjust the partition size

Adjust hard disk partition size

To increase the root space and reduce the home space.

1. View hard disk usage.

[[email protected] ~]# df -hFilesystem                    Size  Used Avail Use% Mounted on/dev/mapper/VolGroup-lv_root   48G   45G   17M 100% /tmpfs                         246M     0  246M   0% /dev/shm/dev/sda1                     485M   33M  427M   8% /boot/dev/mapper/VolGroup-lv_home   50G  180M   47G   1% /home

2. Adjust the size of the home Partition

[[Email protected] ~] # Umount/home [[email protected] ~] # E2fsck-F/dev/mapper/VolGroup-lv_homee2fsck 1.41.12 (17-may-2010) Step 1: Check inode, block, and size Step 2: Check the directory structure Step 2: check directory connectivity pass 4: Checking reference counts step 5th: Check cluster profile information/dev/mapper/VolGroup-lv_home: 11/3303104 files (0.0% non-contiguous ), 253351/13207552 blocks [[email protected] ~] # Resize2fs-P/dev/mapper/VolGroup-lv_home 2gresize2fs 1.41.12 (17-may-2010) resizing the filesystem on/dev/mapper/VolGroup-lv_home to 524288 (4 K) blocks. begin pass 2 (max = 32768) is repositioning the block too pass 3 (max = 404) is scanning inode table xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxthe filesystem on/dev/mapper/VolGroup-lv_home is now 524288 blocks long. [[email protected] ~] # Mount/home [[email protected] ~] # DF-hfilesystem size used avail use % mounted on/dev/mapper/VolGroup-lv_root 48G 45g 17 m 100%/tmpfs 246 M 0 246 m 0%/dev/SHM/dev/sda1 485 m 33 m 427 m 8%/boot/dev/mapper/VolGroup-lv_home 2.0g 152 M 1.8g 8%/home

3. Release Space

[[email protected] ~]# lvreduce -L 2G /dev/mapper/VolGroup-lv_home  WARNING: Reducing active and open logical volume to 2.00 GiB  THIS MAY DESTROY YOUR DATA (filesystem etc.)Do you really want to reduce lv_home? [y/n]: y  Reducing logical volume lv_home to 2.00 GiB  Logical volume lv_home successfully resized[[email protected] ~]# df -hFilesystem                    Size  Used Avail Use% Mounted on/dev/mapper/VolGroup-lv_root   48G   45G   16M 100% /tmpfs                         246M     0  246M   0% /dev/shm/dev/sda1                     485M   33M  427M   8% /boot/dev/mapper/VolGroup-lv_home  2.0G  152M  1.8G   8% /home[[email protected] ~]# vgdisplay  --- Volume group ---  VG Name               VolGroup  System ID  Format                lvm2  Metadata Areas        1  Metadata Sequence No  5  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               99.51 GiB  PE Size               4.00 MiB  Total PE              25474  Alloc PE / Size       13088 / 51.12 GiB  Free  PE / Size       12386 / 48.38 GiB  VG UUID               ILLwIo-pQ0o-2Ayw-fYcP-QhcW-A1id-Sozp1f

4. Add free space to root

[[email protected] ~]#  lvextend -L +48.38G /dev/mapper/VolGroup-lv_root  Rounding size to boundary between physical extents: 48.38 GiB  Extending logical volume lv_root to 96.54 GiB  Logical volume lv_root successfully resized[[email protected] ~]# resize2fs -p /dev/mapper/VolGroup-lv_rootresize2fs 1.41.12 (17-May-2010)Filesystem at /dev/mapper/VolGroup-lv_root is mounted on /; on-line resizing requiredold desc_blocks = 4, new_desc_blocks = 7Performing an on-line resize of /dev/mapper/VolGroup-lv_root to 25307136 (4k) blocks.The filesystem on /dev/mapper/VolGroup-lv_root is now 25307136 blocks long.[[email protected] ~]# df -hFilesystem                    Size  Used Avail Use% Mounted on/dev/mapper/VolGroup-lv_root   96G   45G   46G  50% /tmpfs                         246M     0  246M   0% /dev/shm/dev/sda1                     485M   33M  427M   8% /boot/dev/mapper/VolGroup-lv_home  2.0G  152M  1.8G   8% /home