The new features included in ext4 file system, which were not present in its previous versions

The new features included in ext4 file system, which were not present in its previous versions

1. Extended storage limits and other performance improvements
2. Can support volumes with sizes up to 1 exbibyte (EiB) and files with sizes up to 16 tebibytes (TiB)
3. Traditional block mapping scheme replaced by extents used by ext2/3 filesystems.
4. It is backward compatible with ext3 and ext2.
5. It uses a filesystem performance technique called allocate-on-flush.
6. Limit of subdirectories is increased to 64,000 with “dir_nlink” feature.
7. It uses checksums in the journal, it can safely avoid a disk I/O wait during the journaling process and improving performance slightly.
8. As granularity of second-based timestamps becomes insufficient for modern computers. So ext4 provides timestamps measured in nanoseconds.
9. Ext4 also adds support for date-created timestamps