很多朋友买到国人运营的VPS、或者独立服务器，多数系统采用自动化分区方案：比如一共100G磁盘，自动化分区会分50GB到系统盘，另外50G被划分到home目录，home目录看起...
很多朋友买到国人运营的VPS、或者独立服务器，多数系统采用自动化分区方案：比如一共100G磁盘，自动化分区会分50GB到系统盘，另外50G被划分到home目录，home目录看起来是数据盘，其实它还在同一块磁盘上，以下就是需要将home目录的磁盘容量调整到系统盘中。
昨天接到客户机器系统盘磁盘满，本想将数据迁移到home目录，但是系统盘数据大小和home磁盘容量基本相同，于是打算做迁移，考虑将home容量划分到系统盘下，以下是操作教程。
[root@localhost ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 50G 47G 16M 100% / //lv_root满了 tmpfs 1.9G 72K 1.9G 1% /dev/shm /dev/sda1 485M 40M 420M 9% /boot /dev/mapper/VolGroup-lv_home 406G 19G 366G 5% /home //lv_home空间很多 [root@localhost ~]# resize2fs -p /dev/mapper/VolGroup-lv_home 100G resize2fs 1.41.12 (17-May-2010) Filesystem at /dev/mapper/VolGroup-lv_home is mounted on /home; on-line resizing required On-line shrinking from 107865088 to 65536000 not supported. //先umount才能resize2fs [root@localhost ~]# umount /home //umount home目录 [root@localhost ~]# resize2fs -p /dev/mapper/VolGroup-lv_home 100G resize2fs 1.41.12 (17-May-2010) 请先运行 'e2fsck -f /dev/mapper/VolGroup-lv_home'. //提示要先进行磁盘检测 [root@localhost ~]# e2fsck -f /dev/mapper/VolGroup-lv_home e2fsck 1.41.12 (17-May-2010) 第一步: 检查inode,块,和大小 第二步: 检查目录结构 第3步: 检查目录连接性 Pass 4: Checking reference counts 第5步: 检查簇概要信息 /dev/mapper/VolGroup-lv_home: 1459/16384000 files (4.0% non-contiguous), 5914204/65536000 blocks [root@localhost ~]# resize2fs -p /dev/mapper/VolGroup-lv_home 100G //重定大小 resize2fs 1.41.12 (17-May-2010) Resizing the filesystem on /dev/mapper/VolGroup-lv_home to 26214400 (4k) blocks. Begin pass 2 (max = 32768) 正在重定位块 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Begin pass 3 (max = 2000) 正在扫描inode表 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX The filesystem on /dev/mapper/VolGroup-lv_home is now 26214400 blocks long. [root@localhost ~]# mount /home/ [root@localhost ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 50G 47G 16M 100% / tmpfs 1.9G 72K 1.9G 1% /dev/shm /dev/sda1 485M 40M 420M 9% /boot /dev/mapper/VolGroup-lv_home 99G 19G 75G 20% /home [root@localhost ~]# lvreduce -L 100G /dev/mapper/VolGroup-lv_home //释放空间 WARNING: Reducing active and open logical volume to 100.00 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 100.00 GiB Logical volume lv_home successfully resized [root@localhost ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 50G 47G 16M 100% / tmpfs 1.9G 72K 1.9G 1% /dev/shm /dev/sda1 485M 40M 420M 9% /boot /dev/mapper/VolGroup-lv_home 99G 19G 75G 20% /home [root@localhost ~]# 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 465.27 GiB PE Size 4.00 MiB Total PE 119109 Alloc PE / Size 39372 / 153.80 GiB Free PE / Size 79737 / 311.47 GiB //空闲空间 VG UUID Vt2V4t-Byxs-tQqk-cY0h-IDE3-pabX-LUfkRS [root@localhost ~]# lvextend -L +311.47G /dev/mapper/VolGroup-lv_root //空闲空间加入到lv_root Rounding size to boundary between physical extents: 311.47 GiB Extending logical volume lv_root to 361.47 GiB Logical volume lv_root successfully resized [root@localhost ~]# 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 = 23 //这儿要耐心等待，扩大越多，时间越长 Performing an on-line resize of /dev/mapper/VolGroup-lv_root to 94757888 (4k) blocks. The filesystem on /dev/mapper/VolGroup-lv_root is now 94757888 blocks long. [root@localhost openfire]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 356G 48G 308G 14% / tmpfs 1.9G 72K 1.9G 1% /dev/shm /dev/sda1 485M 40M 420M 9% /boot /dev/mapper/VolGroup-lv_home 99G 19G 75G 20% /home
