Linux Filesystems, Part 4 – Ext4 vs. Ext3 and why Delayed Allocation is Bad

It covers the main differences between ext3 and ext4 with a focus on filesystem consistency. This article was the initial motivation of this blog series, because many engineers are unaware that the standard option of ext4 (delalloc) is dangerous for their data!

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Howto: Linux Filesystems

This blog series aims to be a reference guideline by collecting useful knowledge and tutorials about Linux filesystems, mainly about ext3 and ext4.

Because, as systems engineers/administrators, when we need to manually perform disk maintenance on a server, we know that a tiny mistake may have large consequences.

“Trial-and-Error” is sometimes a good way to learn, and sometimes not. For sensitive topics like internet security or filesystem operations, it is often better to understand the theory based on reliable sources before trying; in this way we can avoid putting the data integrity at unnecessary risk.

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