Linux 101 : The "ext4" filesystem
An ext4 is a Linux filesystem can have files that are up to 16TB in size.
Creating an ext4 filesystem:
We could use the below command to create an"ext4" filesystem on our "/dev/sda3" partition:
We could also set the UUID for a device when creating an ext4 filesystem.
A UUID is a fixed identifier that doesn't change, for example, when we add disks to a system.
Partition names could change when adding a new disk to the system, causing errors.
We set the UUID for our partition using the below command:
We could use the below UUID for example:
"4gh67fg4-e0dc-41d9-g78u-23n454l6ldf4".
We could then mount our filesystem using the below command:
Resizing our partition:
We can resize a filesystem to the wanted size, using the below command:
The size could be for example in:
- M : megabytes
- G : gigabytes
For example, we could have "200M".
Remark:
To reduce the size of a filesystem, the device needs to be unmounted.
Backing up our partition:
Backing up our partition:
To back up our partition to a file, we use the "dump" utility as below:
We start by creating a partition using "fdisk" for example, then we create a filesystem on it using the below command:
We relabel our partition, so that it matches the label of the old partition using the below command:
We mount it, and proceed with the restoration process as shown below:
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