Don’t forget to defragment /home if you’re using BTRFS

As root: (as a regular user it just won’t work) –

btrfs filesystem defragment /home -r

You probably want to run that weekly.

I eventually noticed Thunderbird and phpStorm were being really slow and laggy … at which point I realised the cron job I had (as my non-root user) wasn’t working.

(using filefrag /path/to/file you can see the change in the number of extents change after defragmenting)

Posted

July 13, 2023

linux

David Goodwin

Tags:

btrfs, filesystem, performance

Comments

2 responses to “Don’t forget to defragment /home if you’re using BTRFS”

Duncan

July 14, 2023

Defragmentation, for when you miss the days of looking like a genius to clueless windows 95 users.
David Goodwin

July 14, 2023

Quite 🙂

There is some sort of auto defrag mount option but it seems it’s not enabled by default –

https://btrfs.readthedocs.io/en/latest/Administration.html

https://btrfs.readthedocs.io/en/latest/Defragmentation.html

Don’t forget to defragment /home if you’re using BTRFS

Comments

2 responses to “Don’t forget to defragment /home if you’re using BTRFS”

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