zoukankan      html  css  js  c++  java
  • 无损扩容,调整Centos服务器分区大小,简明扼要

    **因为开始装的服务器用的自动lvm,后来发现home下分区太大了,/分区太小。zabbix报警空间已用80%,所以必须要压缩home分区给/目录 **

    感觉乱乱的,整理一下使用的命令按顺序和思路,能完成的后面就不用看了:

    1.umount /home               ###如果发现busy不能卸载就fuser -m /home查看一下是什么进程在占用,然后kill -9 杀掉
    2.resize2fs -p /dev/mapper/VolGroup-lv_home 20G              ###先设置一下home的大小,做这部的时候会提醒让先运行下面的命令进行检查
    3.e2fsck -f /dev/mapper/VolGroup-lv_home                           ###强制检查一下磁盘并修复错误
    4.resize2fs -p /dev/mapper/VolGroup-lv_home 20G              ###再次运行这个命令把home大小设置为20G
    5.lvreduce -L 20G /dev/mapper/VolGroup-lv_home               ###收缩逻辑卷空间为20G
    6.mount /home                                                                       ###并du -f 查看一下home 大小分配是否成功                                                                             
    7.lvextend -l +100%FREE /dev/mapper/VolGroup-lv_root     ###把剩余的所有空间都分配给/目录
    8.resize2fs -p /dev/mapper/VolGroup-lv_root                         ###执行调整根目录的空间大小,并耐心等待,不要操作
    9.#等待一段时间后就成功了 df -h看看吧
    
    • 首先:以防万一先备份好/home下的文件,然后umount /home分区
      如果发现umount /home分区的时候提示busy说明有进程在占用home分区
      建议用 fuser -m /home命令进行查看一下,然后kill -9 杀掉进程。
    • 然后,
    umount /home
    [root@localhost ~]# umount /home
    [root@localhost ~]# df -h
    Filesystem                    Size  Used Avail Use% Mounted on
    /dev/mapper/VolGroup-lv_root   50G   40G  7.4G  85% /
    tmpfs                          16G     0   16G   0% /dev/shm
    /dev/sda1                     485M   39M  421M   9% /boot
    [root@localhost ~]# resize2fs -p /dev/mapper/ 
    control           VolGroup-lv_home  VolGroup-lv_root  VolGroup-lv_swap  
    [root@localhost ~]# resize2fs -p /dev/mapper/VolGroup-lv_home 20G
    resize2fs 1.41.12 (17-May-2010)
    请先运行 'e2fsck -f /dev/mapper/VolGroup-lv_home'.
    
    [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: 124/13942784 files (8.1% non-contiguous), 966453/55744512 blocks
    [root@localhost ~]# 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 = 32873)
    正在重定位块            XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
    Begin pass 3 (max = 1702)
    正在扫描inode表          XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
    Begin pass 4 (max = 22)
    正在更新inode引用       XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
    The filesystem on /dev/mapper/VolGroup-lv_home is now 5242880 blocks long.
    
    [root@localhost ~]# mount /home
    [root@localhost ~]# df -h
    Filesystem                    Size  Used Avail Use% Mounted on
    /dev/mapper/VolGroup-lv_root   50G   40G  7.4G  85% /
    tmpfs                          16G     0   16G   0% /dev/shm
    /dev/sda1                     485M   39M  421M   9% /boot
    /dev/mapper/VolGroup-lv_home   20G  342M   19G   2% /home
    

    这样就成功把/home分区成功调整到20G大小了,接下来我们进行操作,把剩下的空间分给根目录

     [root@localhost ~]# lvextend -l +100%FREE /dev/mapper/VolGroup-lv_rootlvreduce -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@localhost ~]# lvextend -l +100%FREE /dev/mapper/VolGroup-lv_root
      Extending logical volume lv_root to 242.65 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 = 16
    Performing an on-line resize of /dev/mapper/VolGroup-lv_root to 63608832 (4k) blocks.
    然后就是漫长的等待
    [root@localhost ~]# df -h
    Filesystem                    Size  Used Avail Use% Mounted on
    /dev/mapper/VolGroup-lv_root  114G   40G   69G  37% /
    tmpfs                          16G     0   16G   0% /dev/shm
    /dev/sda1                     485M   39M  421M   9% /boot
    /dev/mapper/VolGroup-lv_home   20G  342M   19G   2% /home
    [root@localhost ~]# df -h
    Filesystem                    Size  Used Avail Use% Mounted on
    /dev/mapper/VolGroup-lv_root  117G   40G   71G  36% /
    tmpfs                          16G     0   16G   0% /dev/shm
    /dev/sda1                     485M   39M  421M   9% /boot
    /dev/mapper/VolGroup-lv_home   20G  342M   19G   2% /home
    [root@localhost ~]# df -h
    Filesystem                    Size  Used Avail Use% Mounted on
    /dev/mapper/VolGroup-lv_root  118G   40G   73G  36% /
    tmpfs                          16G     0   16G   0% /dev/shm
    /dev/sda1                     485M   39M  421M   9% /boot
    /dev/mapper/VolGroup-lv_home   20G  342M   19G   2% /home
    

    可以看到正在扩容,完事

  • 相关阅读:
    jsp mysql 配置线程池
    服务端 模拟 检测 攻击。。乱写
    硕思闪客精灵 7.2 破解版
    unity UnityAwe 插件
    smartfoxserver 2x 解决 Math NAN
    unity 断点下载
    java 监听文件目录修改
    wind7 64 setup appjs
    sfs2x 修改jvm 内存
    unity ngui 解决图层问题
  • 原文地址:https://www.cnblogs.com/lixuebin/p/8352304.html
Copyright © 2011-2022 走看看