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Troubleshoot - by Hostrare

Update On: 23 Jul 2021Linux ext2, ext3 and ext4 file systems

When you organize CentOS, cPanel supports applying an ext filesystem ext2, ext3, or ext4. If you are using CentOS 5.x with the ext4 filesystem, you will want to download and install the package defined in the Red Hat documentation.
When you install Red Hat Enterprise Linux (RHEL), cPanel suggests that you use an ext filesystem (ext2, ext3, or ext4). If you use Red Hat 5.x with the ext4 filesystem, you will want to download and fix the package specified in the Red Hat documentation

Ext2 File System

Ext2 stands for the second long file operation.
It was added in 1993. Developed by Rémy Card.
This was produced to overcome the restriction of the original ext file system.
Ext2 does not have a journaling feature.
On flash drives, USB drives, ext2 is maintained, as it doesn’t require to do the overhead of journaling.
Maximum single file size can be from 16 GB to 2 TB
Overall ext2 file method area can be from 2 TB to 32 TB

Ext3 File System

Ext3 stands for a third lengthened file method.
It was organized in 2001. Produced by Stephen Tweedie.
Beginning from Linux Kernel 2.4.15 ext3 was ready.
The main profit of ext3 is that it supports journaling.
Journaling has a dedicated area in the file method, where all the changes are followed. This permits it to be more robust in stopping file exploitation, especially when write methods are interrupted suddenly.
Maximum unique file capacity can be from 16 GB to 2 TB
Overall ext3 file system size can be from 2 TB to 32 TB

The ext3 filesystem gives three choices.
These areas regards:
writeback – the greater speed at the cost of limited data sincerity. Allows old data to show up in files after the noise and relies on kernel’s official writebacks to flush barriers.
ordered – that the data is consistent with the file system; recently-written files will never show up with trash contents after a crash at the cost of some activity.
journal – Journals all data ordering greater journal space and reduced production. The most secure data recollection system.

Ext4 File System

Ext4 stands for the fourth extended file method.
It was organized in 2008.
Starting from Linux Kernel 2.6.19 ext4 was available.
Supports huge specific file size and overall file method size.
Maximum individual file size can be from 16 GB to 16 TB
Overall maximum ext4 file system size is 1 EB (exabyte). 1 EB = 1024 PB (petabyte). 1 PB = 1024 TB (terabyte).
The directory can receive a maximum of 64,000 subdirectories (as opposed to 32,000 in ext3)
You can also mount an actual ext3 fs as ext4 fs (without becoming to update it).
Several other new highlights are offered in ext4: multiblock allocation delayed allocation, review checksum. fast fsck, etc. All you need to understand is that these new points have developed the performance and security of the filesystem when matched to ext3.
In ext4, you also have the choice of remaking the journaling point “off”.
Please apply this link to convert file systems from ext2 to ext3 or ext4.
http://www.thegeekstuff.com/2011/05/ext2-ext3-ext4/