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71 lines
4.6 KiB
Plaintext
71 lines
4.6 KiB
Plaintext
Episode: 4194
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Title: HPR4194: Get more user space on your Linux filesystem with tune2fs
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Source: https://hub.hackerpublicradio.org/ccdn.php?filename=/eps/hpr4194/hpr4194.mp3
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Transcribed: 2025-10-25 21:06:23
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---
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This is Hacker Public Radio Episode 4194 for Thursday the 29th of August 2024.
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Today's show is entitled, Get More User Space on Your Linux File System with 2-2FS.
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It is hosted by Delta-ray and is about 5 minutes long.
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It carries a clean flag.
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The summary is, how to use the 2-2FS program to reduce the reserve block percentage value.
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You are listening to a show from the reserve queue.
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We are airing it now because we had free slots that were not filled.
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This is a community project that needs listeners to contribute shows in order to survive.
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Please consider recording a show for Hacker Public Radio.
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If you're a Linux user and you've ever run the DF program on your root file system or
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some file system, you've noticed a discrepancy between the size of the file system versus the
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amount used in the available space.
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They don't all add up.
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You've wondered, why is this what they talk about when they talk about space loss to
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formatting or to the difference between two powers of two and powers of ten and stuff
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like that?
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Well, no.
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There's actually another element in play here that is maybe not as well known and it's
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called the reserved bytes percentage and so when a reserve blocks percentage, when
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a EXT3 and EXT4 and EXT2 file system get created, it actually, since forever, it reserves
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5% of the file system so that only the root user can use it.
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I guess the logic here has always been that if you run out of space on your drive, you
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need to probably give the root user some space to work with to recover things or maybe compress
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some files in case like a non-root user filled up the drive with stuff.
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This is why if you add the used and available up, it's only about 95% of the way there
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to the total size and this is because by default, 5% of the file system is reserved for root.
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If you want to change that because when it comes down to it on a one terabyte drive, 5%
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is 50GB, that's quite a bit of space that you could be using for something.
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These days when I install Linux on a system, I'm usually, depending on the total file system
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size, but I'm usually reducing that reserved block percentage to about 1%, and you do
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that with a program called Tune2FS, TUNE2FS, and it has an option called dash M and you
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just give it a percentage amount, so you'd say dash M, space 1, I wouldn't set to 0 just
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in case you really do need that reserved blocks for root if you happen to run out of space,
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so you still have some room to work with.
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But I would at least set to probably 2 or 1 because these days, file systems are so
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big that it's quite a bit of space that's being used there.
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So you say TUNE2FS, space dash M, and then 1, and then space in the file system device,
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so slash dev, slash SDA1 or whatever it is, it's going to be whatever is in the output
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of DF, and so yeah, that can give you some space right there to play with and give you
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a little bit of extra space if you're already running out of space, but if you're already
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running out of space, you might want to look into getting a bigger drive, of course, or
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finding places where you could actually recover some space, and for stuff like that you can
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use programs like NCDU and DU to figure out where you're using up quite a bit of your
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space and so on, or a program like Find, space slash, space, dash size, and then you can
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say plus 100 capital M to find stuff that's more than 100 megabytes, that might quickly
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give you some files that are very large, maybe you've forgotten about like old ISO images
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or large log files that need to be compressed or something, you know, that will help you
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find stuff quickly.
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All right, so if you're hearing this, it probably means that Hacker Public Radio is running
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low on episodes, and so I'd really encourage you to think about stuff that you're interested
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in and think about recording a show, all you have to do is go to hackerpublicradio.org
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and click on the give shows link at the top, and there's more explanation there, but we'd
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love to hear from you.
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Thank you.
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Bye.
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You have been listening to Hacker Public Radio, and Hacker Public Radio does work.
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Today's show was contributed by a HBR listener like yourself.
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If you ever thought of recording podcasts, then click on our contribute link to find
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out how easy it really is.
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Hosting for HBR has been kindly provided by an honesthost.com, the internet archive,
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and rsync.net.
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On the Sadois status, today's show is released under Creative Commons, Attribution 4.0 International
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License.
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