装好centos 6.5以后发现/home分区过大,想调整下大小。
[root@hn ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 50G 769M 46G 2% / tmpfs 7.8G 0 7.8G 0% /dev/shm /dev/sda1 485M 33M 427M 8% /boot /dev/mapper/VolGroup-lv_home 90G 184M 85G 1% /home
调整VolGroup-lv_home分区到20G,剩余分区加到VolGroup-lv_root这个分区上。
1、先卸载分区
[root@hn ~]# umount /home
2、检查VolGroup-lv_home分区的文件,加-f遇到错误继续
[root@hn ~]# e2fsck -f /dev/mapper/VolGroup-lv_home 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/VolGroup-lv_home: 11/5947392 files (0.0% non-contiguous), 420288/23778304 blocks
3、调整VolGroup-lv_home为20G
[root@hn ~]# resize2fs -p /dev/mapper/VolGroup-lv_home 20G resize2fs 1.41.12 (17-May-2010) Resizing the filesystem on /dev/mapper/VolGroup-lv_home to 5242880 (4k) blocks. Begin pass 2 (max = 32768) Relocating blocks XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Begin pass 3 (max = 726) Scanning inode table XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX The filesystem on /dev/mapper/VolGroup-lv_home is now 5242880 blocks long.
4、重新挂载/home分区,并查看大小
[root@hn ~]# mount /home [root@hn ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 50G 769M 46G 2% / tmpfs 7.8G 0 7.8G 0% /dev/shm /dev/sda1 485M 33M 427M 8% /boot /dev/mapper/VolGroup-lv_home 20G 172M 19G 1% /home
5、使用lvreduce减少逻辑卷占用空间,释放多于部分可以让其他分区使用。此处有确认’y’操作,因为缩减可能会造成数据丢失。
[root@hn ~]# lvreduce -L 20G /dev/mapper/VolGroup-lv_home WARNING: Reducing active and open logical volume to 20.00 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 20.00 GiB Logical volume lv_home successfully resized [root@hn ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 50G 769M 46G 2% / tmpfs 7.8G 0 7.8G 0% /dev/shm /dev/sda1 485M 33M 427M 8% /boot /dev/mapper/VolGroup-lv_home 20G 172M 19G 1% /home
6、此时可以查看剩余vg空间大小,倒数第二个Free PE / Size既是空闲空间大小
[root@hn ~]# 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 148.56 GiB PE Size 4.00 MiB Total PE 38031 Alloc PE / Size 19930 / 77.85 GiB Free PE / Size 18101 / 70.71 GiB VG UUID c1DQk2-G0iD-lpPQ-tcfN-YAAY-RlxF-fQWE1j
7、使用lvextend命令扩展Free PE / Size空闲空间到/dev/mapper/VolGroup-lv_root此/分区
此处是给所有FREE空间加到lv_root下: [root@hn ~]# lvextend -l +100%FREE /dev/VolGroup/lv_root Extending logical volume lv_root to 120.71 GiB Logical volume lv_root successfully resized 或者使用下面命令增加: [root@hn ~]# lvextend -L +70G /dev/mapper/VolGroup-lv_root -l和-L的区别如下: {-l|--extents [+]LogicalExtentsNumber[%{VG|LV|PVS|FREE|ORIGIN}] | -L|--size [+]LogicalVolumeSize[bBsSkKmMgGtTpPeE]} --poolmetadatasize [+]MetadataVolumeSize[bBsSkKmMgG]}
8、执行resize2fs 使增加的空间生效
[root@hn ~]# resize2fs -p /dev/mapper/VolGroup-lv_root resize2fs 1.41.12 (17-May-2010) Filesystem at /dev/mapper/VolGroup-lv_root is mounted on /; on-line resizing required old desc_blocks = 4, new_desc_blocks = 8 Performing an on-line resize of /dev/mapper/VolGroup-lv_root to 31642624 (4k) blocks. The filesystem on /dev/mapper/VolGroup-lv_root is now 31642624 blocks long.
9、查看此时分区情况
[root@hn ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 119G 776M 113G 1% / tmpfs 7.8G 0 7.8G 0% /dev/shm /dev/sda1 485M 33M 427M 8% /boot /dev/mapper/VolGroup-lv_home 20G 172M 19G 1% /home
至此已经缩减和扩容完毕。生产环境不建议缩减,执行lvreduce缩减分区可能会造成数据丢失。