Using FDISK to expand partition capacity under Linux CentOS

Expand Disk Space

20G of hard disk space, increased disk size using vsphere client, additional 10G space required;
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After the expansion, restart the system, again using Fdisk-l view, you will find that the hard disk space becomes larger;

[[email protected] ~]# fdisk -ldisk /dev/sda: 32.2 gb, 32212254720  bytes255 heads, 63 sectors/track, 3916 cylindersunits = cylinders  of 16065 * 512 = 8225280 bytesSector size  (logical/physical):  512 bytes / 512 bytesI/O size  (Minimum/optimal): 512 bytes  / 512 bytesdisk identifier: 0x0005210c   device boot       Start         End       Blocks   Id  System/dev/sda1   *            1          26       204800   83  linuxpartition 1 does not  end on cylinder boundary./dev/sda2               26        1301    10240000   83   Linux/dev/sda3            1301         1497     1572864   82   Linux swap / Solaris/dev/sda4             1497        2611     8952832    83  Linux[[email protected] ~]# df -hTFilesystem      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

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Re-create partition, adjust partition information

This experiment is mainly to/dev/sda4 this partition extension, if it is a production environment, please save the backup to other partitions in advance, Although the extended partition size does not result in data loss, for security reasons, please do backup in advance;
First, some data is simulated:

[[email protected] data]# mkdir test[[email protected] data]# echo  " We are linuxer " > linuxprobe[[email protected] data]# lltotal 24- Rw-r--r--.  1 root root    15 May 23 21:59  LINUXPROBEDRWX------.  2 root root 16384 may 23 15:07 lost+ founddrwxr-xr-x. 2 root root  4096 may 23 21:51 test[[email  protected] ~]# umount /dev/sda4          # Unmount the disk partition 

If the disk is busy, use Fuser to locate the program that will be using the disk and end it;

Fuser-m-v/datafuser-m-v-i-k/data

[[email protected] ~]# fdisk /dev/sdawarning: 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, 32212254720 bytes255 heads, 63 sectors/track, 3916  cylindersUnits = cylinders of 16065 * 512 = 8225280  bytessector size  (logical/physical):  512 bytes / 512 bytesi/o size   (minimum/optimal):  512 bytes / 512 bytesdisk identifier: 0x0005210c    device boot      start         end       Blocks   Id  System/dev/sda1   *            1           26      204800   83  linuxpartition 1 does  not end on cylinder boundary./dev/sda2               26        1301     10240000   83  Linux/dev/sda3             1301        1497      1572864   82  Linux swap / Solaris/dev/sda4             1497        2611      8952832   83  linuxcommand  (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 has been deleted disk /dev/sda: 32.2 gb, 32212254720  Bytes255 heads, 63 sectors/track, 3916 cylindersunits = cylinders of  16065 * 512 = 8225280 bytesSector size  (logical/physical):  512  bytes / 512 bytesI/O size  (Minimum/optimal): 512 bytes /  512 bytesdisk identifier: 0x0005210c   device boot       start         end      blocks   id   system/dev/sda1   *           1           26      204800    83  LinuxPartition 1 does not end on cylinder  boundary./dev/sda2              26         1301    10240000   83   linux/dev/sda3            1301         1497     1572864   82  linux  swap / SolarisCommand  (m for help):  n      # Create a new partition Command actioN   e   extended   p   primary partition   (1-4) p              #创建为主分区Selected  partition 4First cylinder  (1497-3916, default 1497):            #经对比, exactly the same as the previous disk column, by default using default value 1497last  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, 32212254720  bytes255 heads, 63 sectors/track, 3916 cylindersunits = cylinders  of 16065 * 512 = 8225280 bytessector size  (logical/physical):  512 bytes / 512 bytesi /o size  (Minimum/optimal): 512 bytes / 512 bytesdisk identifier:  0x0005210c   device boot      start          End      Blocks   Id   system/dev/sda1   *           1           26      204800    83  linuxpartition 1 does not end on cylinder boundary./dev /sda2              26         1301    10240000   83  linux/dev/ Sda3            1301         1497     1572864   82  linux swap / solaris/ dev/sda4            1497         3916    19436582   83  LinuxCommand  (m for help): wp        #保存并退出, if the creation is wrong, exit directly do not save 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 atthe next reboot or after you ruN partprobe (8)  or kpartx (8) syncing disks. 

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[[Email protected] ~]# init 6[[email protected] ~]# e2fsck-f/dev/sda4 #检查分区信息 [[email protected] ~]# Resiz E2fs-p/dev/sda4 #调整分区大小

Re-mount, view partition size, data

[[email protected] ~]# mount /dev/sda4 /data[[email protected] ~]# df  -ht[[email protected] ~]# cat /data/linuxprobewe are  linuxer 

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Using FDISK to expand partition capacity under Linux CentOS