Centos ext4 non-LVM extended partition

--------------- Statement: partitions are at risk and operations must be cautious ------------------------------------

Application Scenario: hyper-V or esxi. expansion is required if the original space is insufficient.

Step 1 (increase disk space) Add the total disk space on the esxi or hyper-V management interface.

Step 2 (increase partition space ):

My current partition is like this

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We can see that there is no space for/dev/sda3, and we need to extend it.

The following steps are required for expansion:

1. Delete/dev/sda3 Partition

2. Create a new sd3 Partition

3. Online extended hard drive

[Email protected]: fdisk/dev/SDA // view the partition data of the current disk and record the start position of sda3.

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Command (M for help): p

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Command (M for help): d

Partition Number (1-4): 3 // Delete sda3. After deletion, run the p command to check whether sda3 is deleted.

Command (M for help): n

Partition type:

   p   primary (0 primary, 0 extended, 4 free)

   e   extended

Select (default p): p

Partition Number (1-4, default 1): 3 // because I used primary before sd3, re-create the primary partition of sd3




First Sector (334-624287999, default 3334): // you can select the start position of sda3. by default, it should be the same as the 3334 recorded previously.

Using default value 3334

Last sector, + sectors or + size {K, M, g} (3334-624287999, default 524287) // The ending number is larger than before, because the system has automatically added our unlocation space.




Command (M for help): W // write to the partition table. If you find any problem with the previous configuration, do not save it (enter W ), otherwise, the previous operations will be written into the partition table.

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.




[Email protected]: reboot // restart the application's new Partition Table







After restart:




[Email protected]: resize2fs/dev/sda3 // extended partition

[Email protected]: DF-H // view the extension result

This article only extends sda3 and does not extend sda2. If sda2 is extended, it may overwrite sda3 data (speculation )... Therefore, I recommend that you choose LVM as your first partition.

-------------- References --------------------------

Http://codesilence.wordpress.com/2013/03/14/live-resizing-of-an-ext4-filesytem-on-linux/

Centos ext4 non-LVM extended partition