EXT4 | How does it work?

[@ivanmaglica264]

2 billion subdirectories, how much time would "ls" take? God forbid you do it on HDD

[@Maple-Circuit]

Not longer than any 3 level htree that's the magic!

[@Maple-Circuit]

Mega lol misread that, yes about a year or 2 lol

[@revenevan11]

Amazing schematics/diagrams, thank you very much for making them available!

[@Maple-Circuit]

Happy you like them!

[@urielsalis]

Would be really cool to have a similar video to this/btrfs on how ZFS works!

[@2daeeun]

I always look forward to your video series. Thank you so much for the informative videos. 🙇‍♂

[@Dr-Zed]

Awesome video as always!

[@Maple-Circuit]

Thanks!

[@XENOSITE-d5i]

Nice video! love it❤

[@Maple-Circuit]

Thanks!

[@__Brandon__]

Will there be a btrfs video too

[@Maple-Circuit]

I have already made one, but it will be remade one days so... yes, but not soon (,

[@TavishMcEwen]

he has one! :3 Weird, i thought i reloaded the page to make sure there wasn't a response

[@flow1194]

i love my ext4 file system 🥰

[@Maple-Circuit]

🥰

[@MmC-l6o]

Amazing video man, you contents amazing such low views pls keep grinding

[@Maple-Circuit]

Don't worry, IM ON THAT GRIND!

[@diggajupadhyay]

Thank you for the video!

[@Maple-Circuit]

Thank you for your comment (;

[@spacewolfjr]

You're the best mon ami!!!

[@Maple-Circuit]

Love you my friend!

[@magovermelhoffv4729]

Thanks, man, great video! I'm looking forward to the kernel 6.13 video. But no pressure, 6.13 doesn't need to be as detailed as 6.12

[@Sound_.-Safari]

Ext4 is bae

[@Microchaosmac]

Thank you for the Video :3

[@Maple-Circuit]

:3

[@whtiequillBj]

@24:10, what are your thoughts on if Extended Attributes should become like NTFS Alternate Data Streams or ZFS Extended Attributes and not have the 64KiB limitation? The extended attribute names are up to 255 bytes. I have another question @26:45, are barriers "necessary", in scare quotes, as in if Linux was a propriety system like Windows would the hard drive manufacturer have provided a way to work around this? tl;dr is this a hardware limitation or a software incompatibility?

[@Maple-Circuit]

I know literally nothing about NTFS and ZFS so I couldn't comment (; I hope I understood your question correctly. it seems that the issue is an hardware one, the disk does not care what data gets written first thus will attempt to make an order that suits it. I didn't research it but if we check any FS with journal on Windows or BSD, we should see the same fix applied. The reason why we can apply barriers is because we have some control over when things gets written to the drive even when the disk tries to do its own order. That would mean that there probably is 2 type of write command that a disk can do, write-now and write-when_you_want... But that's what I got out of reading a couple of papers talking about EXT4, I could be completely wrong (;

[@JonBrase]

Barriers (or something like them) are necessary when you have a system that can rearrange steps of a process to improve performance, or when you have two systems operating on the same data. If you have some part of your process that absolutely requires that a sequence of steps be executed in order, then you *must* have some way of enforcing that order in case the system tries to rearrange it. It's a logical requirement to be able to make certain kinds of performance optimizations without introducing bugs, and shows up in both hardware and software in many areas of computing.

[@marekjakimowicz]

Is 512PB big number for today or near future storage for servers?

[@Maple-Circuit]

512PB is still very big. It is probably only a problem for giants like Google (;

[@kreuner11]

@@Maple-Circuit but at that point, youre probably not using ext4, but an RAID-native file system like ZFS

[@Maple-Circuit]

@kreuner11 exactly! Ext4 was never meant for such a large-scale use and isn't the FS for the job.

[@fgbreel]

Coolio! 😁

[@Wraient]

bro came

[@hampus23]

👍👍👍👍

[@Maple-Circuit]

👍

[@nabibunbillah1839]

How many years of knowledge is in your head?? 🧐😮

[@Maple-Circuit]

More than my own lifetime XD

[@stylisttaps]

Just landed a new job recently and in part of my first job interview / meeting I talked about the differences between ext3 and 4 and how they affected my work maintaining new and legacy lab systems at a previous employer. The interviewer empathized heavily having gone through the transition years before me. Fun little connection point that definitely didn’t hurt. Great video! Love your work!