Linux下使用fdisk扩展分区容量

硬盘空间为20G，使用vSphere Client增加磁盘大小，需要再增加10G空间;

扩展完后，重启系统，再次使用fdisk -l查看，会发现硬盘空间变大了；

[root@linuxprobe ~]# fdisk -l Disk /dev/sda: 32.2 GB,  bytes 255 heads, 63 sectors/track, 3916 cylinders Units = cylinders of 16065 * 512 =  bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0005210c Device Boot Start End Blocks Id System /dev/sda1 * 1 26  83 Linux Partition 1 does not end on cylinder boundary. /dev/sda2 26 1301  83 Linux /dev/sda3 1301 1497  82 Linux swap / Solaris /dev/sda4 1497 2611  83 Linux [root@linuxprobe ~]# df -hT Filesystem Type Size Used Avail Use% Mounted on /dev/sda2 ext4 9.7G 1.5G 7.7G 16% / tmpfs tmpfs 939M 0 939M 0% /dev/shm /dev/sda1 ext4 194M 34M 151M 19% /boot /dev/sda4 ext4 8.5G 148M 7.9G 2% /data 

本次实验主要对/dev/sda4这个分区扩展，如果是生产环境，请提前做好备份保存到其他分区，虽然扩展分区大小不会导致数据丢失，安全起见，请提前做好备份；
首先模拟出一些数据：

[root@linuxprobe data]# mkdir test [root@linuxprobe data]# echo "we are Linuxer" > linuxprobe [root@linuxprobe data]# ll total 24 -rw-r--r--. 1 root root 15 May 23 21:59 linuxprobe drwx------. 2 root root 16384 May 23 15:07 lost+found drwxr-xr-x. 2 root root 4096 May 23 21:51 test [root@linuxprobe ~]# umount /dev/sda4 #卸载磁盘分区 

若提示磁盘忙，使用fuser找出将正在使用磁盘的程序并结束掉；

fuser -m -v /data fuser -m -v -i -k /data

使用fdisk工具先删除/dev/sda4分区，然后创建新分区，注意开始的磁柱号要和原来的一致（是保证数据不丢失的关键步骤），结束的磁柱号默认回车使用全部磁盘。

[root@linuxprobe ~]# fdisk /dev/sda WARNING: DOS-compatible mode is deprecated. It's strongly recommended to switch off the mode (command 'c') and change display units to sectors (command 'u'). Command (m for help): p #查看分区表信息 Disk /dev/sda: 32.2 GB,  bytes 255 heads, 63 sectors/track, 3916 cylinders Units = cylinders of 16065 * 512 =  bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0005210c Device Boot Start End Blocks Id System /dev/sda1 * 1 26  83 Linux Partition 1 does not end on cylinder boundary. /dev/sda2 26 1301  83 Linux /dev/sda3 1301 1497  82 Linux swap / Solaris /dev/sda4 1497 2611  83 Linux Command (m for help): d #删除分区 Partition number (1-4): 4  #删除第四个 Command (m for help): p #再次查看分区信息，/dev/sda4已被删除 Disk /dev/sda: 32.2 GB,  bytes 255 heads, 63 sectors/track, 3916 cylinders Units = cylinders of 16065 * 512 =  bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0005210c Device Boot Start End Blocks Id System /dev/sda1 * 1 26  83 Linux Partition 1 does not end on cylinder boundary. /dev/sda2 26 1301  83 Linux /dev/sda3 1301 1497  82 Linux swap / Solaris Command (m for help): n #创建新的分区 Command action e extended p primary partition (1-4) p #创建为主分区 Selected partition 4 First cylinder (1497-3916, default 1497):  #经对比，正好和上一个磁盘柱一致，默认即可 Using default value 1497 Last cylinder, +cylinders or +size{K,M,G} (1497-3916, default 3916): Using default value 3916  #直接默认就可以 Command (m for help): p  #查看分区表信息 Disk /dev/sda: 32.2 GB,  bytes 255 heads, 63 sectors/track, 3916 cylinders Units = cylinders of 16065 * 512 =  bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0005210c Device Boot Start End Blocks Id System /dev/sda1 * 1 26  83 Linux Partition 1 does not end on cylinder boundary. /dev/sda2 26 1301  83 Linux /dev/sda3 1301 1497  82 Linux swap / Solaris /dev/sda4 1497 3916  83 Linux Command (m for help): wp #保存并退出，如果创建有误，直接退出不要保存即可 The partition table has been altered! Calling ioctl() to re-read partition table. WARNING: Re-reading the partition table failed with error 16: Device or resource busy. The kernel still uses the old table. The new table will be used at the next reboot or after you run partprobe(8) or kpartx(8) Syncing disks. 

重新创建分区后，需要重启一下；

[root@linuxprobe ~]# init 6 [root@linuxprobe ~]# e2fsck -f /dev/sda4 #检查分区信息 [root@linuxprobe ~]# resize2fs -p /dev/sda4 #调整分区大小 

[root@linuxprobe ~]# mount /dev/sda4 /data [root@linuxprobe ~]# df -hT [root@linuxprobe ~]# cat /data/linuxprobe we are Linuxer

本文转载自：http://www.linuxprobe.com/linux-fdisk-size.html

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