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CentOS环境下下调整home和根分区大小
项目建设方给提供了3台CentOS的服务器，连接进去之后发现磁盘空间很大，但是都放在了home目录下，所以需要调整一下。
1、查看磁盘使用情况
[root@CentOS ~]# df -hFilesystem Size Used Avail Use% Mounted on/dev/mapper/vg_centos-lv_root 50G 9.9G 37G 22% /tmpfs 3.9G 72K 3.9G 1% /dev/shm/dev/sda1 485M 40M 421M 9% /boot/dev/mapper/vg_centos-lv_home 439G 200M 417G 1% /home
2、卸载/home
[root@CentOS ~]# umount /home[root@CentOS ~]# [root@CentOS ~]# df -hFilesystem Size Used Avail Use% Mounted on/dev/mapper/vg_centos-lv_root 50G 11G 37G 22% /tmpfs 3.9G 72K 3.9G 1% /dev/shm/dev/sda1 485M 40M 421M 9% /boot
3、调整分区大小
[root@CentOS ~]# resize2fs -p /dev/mapper/vg_centos-lv_home 40Gresize2fs 1.41.12 (17-May-2010)请先运行 ‘e2fsck -f /dev/mapper/vg_centos-lv_home‘.
[root@CentOS ~]# e2fsck -f /dev/mapper/vg_centos-lv_homee2fsck 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/vg_centos-lv_home: 163/29212672 files (0.0% non-contiguous), 1884450/116819968 blocks
再次执行
[root@CentOS ~]# resize2fs -p /dev/mapper/vg_centos-lv_home 40Gresize2fs 1.41.12 (17-May-2010)Resizing the filesystem on /dev/mapper/vg_centos-lv_home to 10485760 (4k) blocks.Begin pass 2 (max = 32975)正在重定位块 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXBegin pass 3 (max = 3566)正在扫描inode表 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXBegin pass 4 (max = 84)正在更新inode引用 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXThe filesystem on /dev/mapper/vg_centos-lv_home is now 10485760 blocks long.
4、挂载/home
[root@CentOS ~]# mount /home查看磁盘使用情况：
[root@CentOS ~]# df -hFilesystem Size Used Avail Use% Mounted on/dev/mapper/vg_centos-lv_root 50G 11G 37G 22% /tmpfs 3.9G 72K 3.9G 1% /dev/shm/dev/sda1 485M 40M 421M 9% /boot/dev/mapper/vg_centos-lv_home 40G 178M 38G 1% /home
5、设置空闲空间
[root@CentOS ~]# lvreduce -L 40G /dev/mapper/vg_centos-lv_home WARNING: Reducing active and open logical volume to 40.00 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 40.00 GiB Logical volume lv_home successfully resized
使用lvreduce指令用于减少LVM逻辑卷占用的空间大小。可能会删除逻辑卷上已有的数据，所以在操作前必须进行确认。记得输入 “y”
[root@localhost ~]# lvreduce -L 20G /dev/mapper/VolGroup-lv_home
注：lvreduce -L 20G的意思为设置当前文件系统为20G，如果lvreduce -l 20G是指从当前文件系统上减少20G
使用lvreduce减小逻辑卷的大小。注意：减小后的大小不能小于文件的大小，否则会丢失数据。
可以使用vgdisplay命令等查看一下可以操作的大小。也可以是用fdisk -l命令查看详细信息。
[root@localhost ~]# vgdisplay
注：vgdisplay为显示LVM卷组的元数据信息。
6、将空闲空间挂载到根目录下
[root@CentOS ~]# vgdisplay --- Volume group --- VG Name vg_centos 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 499.51 GiB PE Size 4.00 MiB Total PE 127874 Alloc PE / Size 24032 / 93.88 GiB Free PE / Size 103842 / 405.63 GiB VG UUID ASX7Lb-Y0p6-YCGH-hNYp-ewdK-iFse-fq7uWw [root@CentOS ~]# [root@CentOS ~]# [root@CentOS ~]# lvextend -L +400G /dev/mapper/vg_centos-lv_root Extending logical volume lv_root to 450.00 GiB Logical volume lv_root successfully resized[root@CentOS ~]# [root@CentOS ~]# [root@CentOS ~]# vgdisplay --- Volume group --- VG Name vg_centos System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 6 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 499.51 GiB PE Size 4.00 MiB Total PE 127874 Alloc PE / Size 126432 / 493.88 GiB Free PE / Size 1442 / 5.63 GiB VG UUID ASX7Lb-Y0p6-YCGH-hNYp-ewdK-iFse-fq7uWw [root@CentOS ~]# df -hFilesystem Size Used Avail Use% Mounted on/dev/mapper/vg_centos-lv_root 50G 11G 37G 22% /tmpfs 3.9G 72K 3.9G 1% /dev/shm/dev/sda1 485M 40M 421M 9% /boot/dev/mapper/vg_centos-lv_home 40G 178M 38G 1% /home[root@CentOS ~]# [root@CentOS ~]# [root@CentOS ~]# resize2fs -p /dev/mapper/vg_centos-lv_rootresize2fs 1.41.12 (17-May-2010)Filesystem at /dev/mapper/vg_centos-lv_root is mounted on /; on-line resizing requiredold desc_blocks = 4, new_desc_blocks = 29Performing an on-line resize of /dev/mapper/vg_centos-lv_root to 117964800 (4k) blocks.The filesystem on /dev/mapper/vg_centos-lv_root is now 117964800 blocks long.[root@CentOS ~]# df -hFilesystem Size Used Avail Use% Mounted on/dev/mapper/vg_centos-lv_root 443G 11G 411G 3% /tmpfs 3.9G 72K 3.9G 1% /dev/shm/dev/sda1 485M 40M 421M 9% /boot/dev/mapper/vg_centos-lv_home 40G 178M 38G 1% /home
CentOS环境下下调整home和根分区大小
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