Linux系统数据盘在线扩容

1、卸载数据盘

[root@localhost ~]# umount /dev/sdb1

 

2、使用fdisk /dev/sdb 对数据盘分区操作

[root@localhost ~]# fdisk /dev/sdb

WARNING: The size of this disk is 3.0 TB (3000034656256 bytes).
DOS partition table format can not be used on drives for volumes
larger than (2199023255040 bytes) for 512-byte sectors. Use parted(1) and GUID 
partition table format (GPT).

Welcome to fdisk (util-linux 2.23.2).

Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.


Command (m for help): p

Disk /dev/sdb: 3000.0 GB, 3000034656256 bytes, 5859442688 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000b6f25

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1            2048  1048578047   524288000   83  Linux

Command (m for help): d
Selected partition 1
Partition 1 is deleted

Command (m for help): n
Partition type:
   p   primary (0 primary, 0 extended, 4 free)
   e   extended
Select (default p): 
Using default response p
Partition number (1-4, default 1): 
First sector (2048-4294967295, default 2048): 
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-4294967294, default 4294967294): +1300G
Partition 1 of type Linux and of size 1.3 TiB is set

Command (m for help): p

Disk /dev/sdb: 3000.0 GB, 3000034656256 bytes, 5859442688 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000b6f25

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1            2048  2726299647  1363148800   83  Linux

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.

3、检查文件系统

[root@localhost ~]# e2fsck -f /dev/sdb1
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/sdb1: 13/32768000 files (0.0% non-contiguous), 3714898/131072000 blocks

4、变更文件系统大小

[root@localhost ~]# resize2fs /dev/sdb1
resize2fs 1.42.9 (28-Dec-2013)
Resizing the filesystem on /dev/sdb1 to 340787200 (4k) blocks.
The filesystem on /dev/sdb1 is now 340787200 blocks long.

5、重新挂载

[root@localhost ~]# mount -a
[root@localhost ~]# df -Th
Filesystem     Type      Size  Used Avail Use% Mounted on
/dev/sda2      ext4       99G  3.5G   90G   4% /
devtmpfs       devtmpfs   16G     0   16G   0% /dev
tmpfs          tmpfs      16G     0   16G   0% /dev/shm
tmpfs          tmpfs      16G  9.2M   16G   1% /run
tmpfs          tmpfs      16G     0   16G   0% /sys/fs/cgroup
/dev/sda1      ext4      477M  122M  326M  28% /boot
/dev/sda5      ext4      142G  942M  134G   1% /var
tmpfs          tmpfs     3.2G   16K  3.2G   1% /run/user/0
/dev/loop0     iso9660   4.1G  4.1G     0 100% /mnt
/dev/sdb1      ext4      1.3T  6.2G  1.2T   1% /storage