centos追加扩容整块磁盘容量

1. 原磁盘/dev/vdb有100G，整块直接挂载到了/data目录下
2. 后来追加了200G到/dev/vdb上

   [root@i-QxxV9WFa3-2 ~]# lsblk
   NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
   sr0     11:0    1  386K  0 rom
   vda    253:0    0  100G  0 disk
   └─vda1 253:1    0  100G  0 part /
   vdb    253:16   0  300G  0 disk /data
   [root@i-QxxV9WFa3-2 ~]# df -TH
   Filesystem     Type      Size  Used Avail Use% Mounted on
   devtmpfs       devtmpfs  4.1G     0  4.1G   0% /dev
   tmpfs          tmpfs     4.1G  8.2k  4.1G   1% /dev/shm
   tmpfs          tmpfs     4.1G  413M  3.7G  11% /run
   tmpfs          tmpfs     4.1G     0  4.1G   0% /sys/fs/cgroup
   /dev/vda1      xfs       108G  4.4G  104G   5% /
   tmpfs          tmpfs     818M     0  818M   0% /run/user/0
   /dev/vdb       ext4      106G  105G     0 100% /data
   

3. 扩容步骤

   #先解除挂载
   umount /data
   #检查磁盘
   e2fsck -f /dev/vdb 
   #扩容
   resize2fs /dev/vdb
   #重新挂载
   mount /dev/vdb /data
   

4. 结果

   [root@i-QxxV9WFa3-1 ~]# umount /data
   [root@i-QxxV9WFa3-1 ~]# e2fsck -f /dev/vdb
   e2fsck 1.42.9 (28-Dec-2013)
   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/vdb: 2787/6553600 files (84.4% non-contiguous), 26072290/26214400 blocks
   [root@i-QxxV9WFa3-1 ~]# resize2fs /dev/vdb
   resize2fs 1.42.9 (28-Dec-2013)
   Resizing the filesystem on /dev/vdb to 78643200 (4k) blocks.
   The filesystem on /dev/vdb is now 78643200 blocks long.[root@i-QxxV9WFa3-1 ~]# mount /dev/vdb /data
   [root@i-QxxV9WFa3-1 ~]# df -Th
   Filesystem     Type      Size  Used Avail Use% Mounted on
   devtmpfs       devtmpfs  3.8G     0  3.8G   0% /dev
   tmpfs          tmpfs     3.9G  8.0K  3.9G   1% /dev/shm
   tmpfs          tmpfs     3.9G  394M  3.5G  11% /run
   tmpfs          tmpfs     3.9G     0  3.9G   0% /sys/fs/cgroup
   /dev/vda1      xfs       100G  4.1G   96G   5% /
   tmpfs          tmpfs     780M     0  780M   0% /run/user/0
   /dev/vdb       ext4      296G   98G  183G  35% /data