扩容主/备物理数据盘：
[root@MySQL02 ~]# drbdadm down data
[root@MySQL02 ~]# mount /dev/sdb1 /mnt/
[root@MySQL02 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 7.2G 1.9G 5.0G 28% /
tmpfs 242M 0 242M 0% /dev/shm
/dev/sda1 194M 57M 128M 31% /boot
/dev/sdb1 380M 11M 350M 3% /mnt # 可以看到备节点磁盘利用率只有380M
[root@MySQL02 ~]# parted /dev/sdb p
Model: Msft Virtual Disk (scsi)
Disk /dev/sdb: 2147MB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End Size Type File system Flags
1 32.3kB 814MB 814MB primary ext4 # 然而备节点真实大小为814M
2 814MB 979MB 165MB primary
[root@MySQL02 ~]# umount /mnt/
[root@MySQL02 ~]# e2fsck -f /dev/sdb1 # 查看分区大小
e2fsck 1.41.12 (17-May-2010)
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: 38/100744 files (0.0% non-contiguous), 22971/401409 blocks
[root@MySQL02 ~]# resize2fs /dev/sdb1 # 重新分配分区（扩容）
resize2fs 1.41.12 (17-May-2010)
Resizing the filesystem on /dev/sdb1 to 795184 (1k) blocks.
The filesystem on /dev/sdb1 is now 795184 blocks long.
[root@MySQL02 ~]# mount /dev/sdb1 /mnt/
[root@MySQL02 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 7.2G 1.9G 5.0G 28% /
tmpfs 242M 0 242M 0% /dev/shm
/dev/sda1 194M 57M 128M 31% /boot
/dev/sdb1 752M 11M 703M 2% /mnt # 备节点磁盘空间已增加至最大
[root@MySQL02 ~]# ls /mnt/
本文出自 “奋斗吧” 博客，请务必保留此出处http://lvnian.blog.51cto.com/7155281/1709384
原文：http://lvnian.blog.51cto.com/7155281/1709384