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Linux how to use fdisk combined with partprobe command not to restart the system to add a new disk partition, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain in detail for you, people with this need can come to learn, I hope you can gain something.

The built-in hard disk of the host exceeds the 300GB. Currently, only 3 primary partitions are used, less than 70GB, as shown below:

[root@db2] # df-h

Filesystem Size Used Avail Use% Mounted on

/ dev/sda1 29G 3.7G 24G 14% /

/ dev/sda2 29G 22G 5.2G 81% / oracle

Tmpfs 2.0G 0 2.0G 0% / dev/shm

[root@db2 ~] # cat / proc/partitions

Major minor # blocks name

8 0 311427072 sda

Sda1

8 2 30716280 sda2

8 3 8193150 sda3

8 16 976896 sdb

8 32 976896 sdc

Now we need to add a 100GB space to the system to store the data files without affecting the operation of the business on the existing system.

Use fdisk with the partprobe command to add a new disk partition without rebooting the system. The steps are as follows:

Step 1, add a new disk partition

[root@db2 ~] # fdisk / dev/sda

The number of cylinders for this disk is set to 38770.

There is nothing wrong with that, but this is larger than 1024

And could in certain setups cause problems with:

1) software that runs at boot time (e.g.old versions of LILO)

2) booting and partitioning software from other OSs

(e.g., DOS FDISK, OS/2 FDISK)

Command (m for help): P

Disk / dev/sda: 318.9 GB, 318901321728 bytes

255 heads, 63 sectors/track, 38770 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

/ dev/sda1 * 1 3824 30716248 + 83 Linux

/ dev/sda2 3825 7648 30716280 83 Linux

/ dev/sda3 7649 8668 8193150 82 Linux swap / Solaris

Command (m for help): n

Command action

E extended

P primary partition (1-4)

P

Selected partition 4

First cylinder (8669-38770, default 8669):

Using default value 8669

Last cylinder or + size or + sizeM or + sizeK (8669-38770, default 38770): + 100G

Command (m for help): W

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.

Syncing disks.

[root@db2 ~] #

Step 2, use the tool partprobe to have kernel read the partition information

[root@db2 ~] # partprobe

Using the fdisk tool only writes partition information to disk, and restarts the system if you need mkfs disk partitions

Using partprobe allows kernel to reread the partition information, thus avoiding restarting the system.

Step 3, format the file system

[root@db2 ~] # mkfs.ext3 / dev/sda4

Mke2fs 1.39 (29-May-2006)

Filesystem label=

OS type: Linux

Block size=4096 (log=2)

Fragment size=4096 (log=2)

12222464 inodes, 24416791 blocks

1220839 blocks (5.00%) reserved for the super user

First data block=0

Maximum filesystem blocks=4294967296

746 block groups

32768 blocks per group, 32768 fragments per group

16384 inodes per group

Superblock backups stored on blocks:

32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632

2654208, 4096000, 7962624, 11239424, 20480000, 23887872

Writing inode tables: done

Creating journal (32768 blocks): done

Writing superblocks and filesystem accounting information:

Done

This filesystem will be automatically checked every 26 mounts or

180 days, whichever comes first. Use tune2fs-c or-i to override.

[root@db2 ~] #

Step 4, mount new partition / dev/sda4

[root@db2 ~] # e2label / dev/sda4 / data

[root@db2 ~] # mkdir / data

[root@db2 ~] # mount / dev/sda4 / data

[root@db2 ~] # df

Filesystem 1K-blocks Used Available Use% Mounted on

/ dev/sda1 29753556 3810844 24406900 14% /

/ dev/sda2 29753588 11304616 16913160 41% / oracle

Tmpfs 2023936 0 2023936 / dev/shm

/ dev/sda4 96132968 192312 91057300 1% / data

[root@db2 ~] #

Summary: with partprobe, you can create new partitions with the fdisk tool without rebooting the system.

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