Anatomy of ext4 (developerWorks)

developerWorks has posted a detailed look at the ext4 filesystem. "One of the first visible differences in ext4 is the increased support for file system volumes, file sizes, and subdirectory limits. Ext4 supports file systems of up to 1 exabyte in size (1000 petabytes). Although that seems huge by today's standards, storage consumption continues to grow, so ext4 was definitely developed with the future in mind. Files within ext4 may be up to 16TB in size (assuming 4KB blocks), which is eight times the limit in ext3."

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