Hi!
I used to have three raid1:
2 x 4Tb Ssd dedicated to store personal data
2 x 6Tb HDD dedicated to store “iso’s”, the eye patched ones.
2 x 4Tb ssd for backup.
Ext4 everywhere.
I run this setup for years, maybe even 20 years (with many different disks and sizes over time).
I decided that was time to be more efficient.
I removed the two HDD, saving quite a lot of power, and switched the four sdd to RAID5, Then put BTRFS on top of that. Please note, I am not using btrfs raid feature, but Linux mdadm software raid (which I have been using rock solid for years) with btrfs on top as if on a single drive.
I choose MD not only for my past very positive experience, but specially because I love how easy is to recover and restore from many issues.
I choose not to try zfs because I don’t feel comfortable in using out of kernel drivers and I dislike how zfs seems to be RAM hungry.
What do you guys think?
Good point on the expansion. But o am not too bothered about it, as I have always done by moving data around. Takes a while, but leaves you with a set of disks with the old data still there, and it saved my ass a few times in the past. Now I should be fine with good backups, but you never know.