查看磁盘状态

执行df -Th查看磁盘情况

[root@iotdbtest1 ~]# df -Th
Filesystem     Type      Size  Used Avail Use% Mounted on
devtmpfs       devtmpfs  7.7G     0  7.7G   0% /dev
tmpfs          tmpfs     7.7G     0  7.7G   0% /dev/shm
tmpfs          tmpfs     7.7G  456K  7.7G   1% /run
tmpfs          tmpfs     7.7G     0  7.7G   0% /sys/fs/cgroup
/dev/sda1      ext4       20G  2.4G   17G  13% /
tmpfs          tmpfs     1.6G     0  1.6G   0% /run/user/0

可以看到系统磁盘/dev/sda1只有20G，实际这个磁盘有500G

！！！需要注意本教程不适用于lvm磁盘，系统盘的挂载磁盘只能是类似/dev/sdax 、/dev/vdax、/dev/sdcx这样的形式，不能是lvm磁盘，比如类似/dev/mapper/centos-root这样的挂载磁盘是不能使用本教程的方法扩容的

根目录扩充

如果查看到的系统盘是/dev/sda1，则执行fdisk /dev/sda对磁盘sda进行操作

如果查看到的系统盘是/dev/vda1，则执行fdisk /dev/vda对磁盘vda进行操作

[root@iotdbtest1 ~]# fdisk /dev/sdaWelcome to fdisk (util-linux 2.32.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.# 删除分区
Command (m for help): d
Selected partition 1
Partition 1 has been deleted.
# 新建分区
Command (m for help): n
Partition typep   primary (0 primary, 0 extended, 4 free)e   extended (container for logical partitions)
# 选择分区类型，回车默认主分区
Select (default p): Using default response p.
# 分区编号，回车默认
Partition number (1-4, default 1): 
# 起始位置，回车默认
First sector (2048-1048575999, default 2048): 
# 终止位置，回车默认
Last sector, +sectors or +size{K,M,G,T,P} (2048-1048575999, default 1048575999): Created a new partition 1 of type 'Linux' and of size 500 GiB.
Partition #1 contains a ext4 signature.# 是否移除签名，选择N否
Do you want to remove the signature? [Y]es/[N]o: N# w保存
Command (m for help): wThe partition table has been altered.
Syncing disks.

同步容量

如果系统挂载的磁盘是sda1，则执行下面的命令

resize2fs /dev/sda1

执行结果类似下面：

[root@iotdbtest1 ~]# resize2fs /dev/sda1
resize2fs 1.46.0 (29-Jan-2020)
Filesystem at /dev/sda1 is mounted on /; on-line resizing required
old_desc_blocks = 2, new_desc_blocks = 32
The filesystem on /dev/sda1 is now 131071744 (4k) blocks long.

验证容量

执行df -Th查看磁盘实际分配

[root@iotdbtest1 ~]# df -Th
Filesystem     Type      Size  Used Avail Use% Mounted on
devtmpfs       devtmpfs  7.7G     0  7.7G   0% /dev
tmpfs          tmpfs     7.7G     0  7.7G   0% /dev/shm
tmpfs          tmpfs     7.7G  456K  7.7G   1% /run
tmpfs          tmpfs     7.7G     0  7.7G   0% /sys/fs/cgroup
/dev/sda1      ext4      492G  2.4G  470G   1% /
tmpfs          tmpfs     1.6G     0  1.6G   0% /run/user/0