BTRFS compression on install (also external drives)

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Hello!

Is there a way in the Fedora 32 installer to set the compression mount option for a new BTRFS filesystem before installing Fedora itself? I know I can add the option to the fstab file after installation, reboot, and then run the defragment command to compress after the fact, but it would be convenient if I could just have the filesystem compressed right away during installation.

Also, from what I've read I think I already know the answer to this, but I'll ask to make sure: is it possible to set the compression option persistently in the filesystem itself? It would be nice if I could have an external USB hard drive (with its obvious IO bottleneck) compressed as well. However, it seems like I would then have to always manually mount the drive with the compression option, or set the compression attribute after mounting. Either way, this isn't persistent. I also know I could set the disk's UUID to always be mounted with the compression option, but that is specific to one machine.


--
Terveisin / Regards,
Matti Pulkkinen
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