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53 lines
3.8 KiB
Plaintext
53 lines
3.8 KiB
Plaintext
Episode: 1540
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Title: HPR1540: The Journaling File System
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Source: https://hub.hackerpublicradio.org/ccdn.php?filename=/eps/hpr1540/hpr1540.mp3
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Transcribed: 2025-10-18 04:47:51
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---
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You
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Okay guys, hey welcome and I hope all are having a great day.
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I am continuing my thing on file systems, different ones that I've used, ones that I've found
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and things that are going on.
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Work we've been having a lot of talk about different file systems and what's going on
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and I do a lot of ERP stuff and so much, much talk about BTFRS and XFS and different things
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and I just thought I'd do a little research and maybe share some of that research with you.
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So we covered XT, the original thing that came in Linux kernel 9.6 and we talked about XT2
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and that you know it had originally two terabytes and then was upgraded to 32 terabytes
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and that it had lots of things and so the way that you fixed most of the errors in here,
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particularly the in node error that XT2 had that was so wrong but that I never had a problem with
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but if you read online that there's lots of people that had lots of problems with it.
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So the way to get rid of that is with something called a journaling file system.
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And journaling file systems provide a new level of safety to the system
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instead of writing directly to the storage device when updating the in node table,
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journaling file systems write file changes to a temporary file called the journal first.
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And after the data is successfully written to the storage device, in node table, the journal entry is deleted.
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If the system should crash or suffer a power added before the data can be written to the storage device,
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the journaling file system just needs to read through the journal file and process any uncommended data leftover.
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There are three different methods of journaling commonly used each with different levels of protection.
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The first is a thing called data mode and in data mode both the in node and the file data are journaled.
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This offers a low risk of losing data but very poor performance.
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And then they have something called the ordered mode.
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Only the in node data is written to the journal but not removed until after the file is successfully written.
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It's a good compromise between performance and safety.
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Then there's something called the write back mode.
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Only in node data is written to the journal.
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The control over when the file data is written.
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It's a higher risk of losing data but is still better than not using journaling.
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The limitation, the data mode journaling method by is by far the safest for protecting data but is also the slowest.
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All of the data written to the storage device must be written twice, once to the journal and then again to the actual storage device.
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This can cause poor performance especially for systems that do a lot of writing.
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Over the years a few different journaling file systems have appeared and we'll talk about a lot of those later.
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Okay, I hope that you've enjoyed this installment of the different file systems.
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If you want to contact me at JWP5 at hotmail.com, thank you very much.
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