On 1/13/25 13:24, Fabio Fantoni wrote:
btrfs profiles work differently but other hardware or software raids, many users may not inform themselves well beforehand but even in the case of informed users even if technically now btrfs allows lower limits with the creation of raid 0 (and raid10) I think it would be better to keep them at the base at the creation and then it must be the user who consciously makes any subsequent conversions.
Hm, I'm still unsure about this, because AFAIK we already allow creating ZFS RAID0 with a single disk, which technically also isn't a "real" RAID0 setup itself. But fair point for RAID10, it could be irritating for users to have a discrepancy between the minimum disk amount of ZFS and BTRFS RAID10 and it'd be a bit harder to communicate that in a understandable manner.
regarding btrfs profiles at creation, one thing that could be useful is to always put duplicate metadata (dup with single disk or raid 1 in the case of raid0), if you don't want it by default maybe put it as an additional option, and if you don't want that either at least add it to the documentation (as a suggestion if you want greater resilience of the filesystem without consuming excessive space)
Currently, the installer creates the BTRFS filesystem with the data and metadata both using the same profile. I also think it could be valuable to have an "advanced" option, which allows to set a separate profile for the metadata.
Feel free to send either a RFC for it (even if I can't tell you whether it will be accepted as it adds some complexity to the fs setup) or create a Bugzilla so also other users and developers can discuss it.
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