On Tue, Jan 5, 2021 at 11:49 AM Richard Shaw <hobbes1069@xxxxxxxxx> wrote: > > On Tue, Jan 5, 2021 at 12:31 PM Chris Murphy <lists@xxxxxxxxxxxxxxxxx> wrote: >> >> On Tue, Jan 5, 2021 at 6:24 AM Richard Shaw <hobbes1069@xxxxxxxxx> wrote: >> > Ok, so not so bad. The main reason I'm considering raid5 is that I have one 4TB drive right now, if I add 2 more with raid one, I'm only going to get 2TB. I know it's kind of a duh, you're mirroring and right now I have no redundancy, but this is for home use and $$$/TB is important and I can't fit any more drives in this case :) >> >> Adding 2 drives at a time to Btrfs raid1 is trivial, you just add each: >> btrfs dev add /dev/3 /mnt >> btrfs dev add /dev/4 /mnt >> >> Implies both mkfs and resize. You don't need to balance it. > > > Ok, but my current drive is ext4 formatted. I could convert it in place but I just did that with my home drive on my desktop and it does take a while to create and remove the ext2_saved image. Wouldn't it be better to create a 2 drive raid1 array, copy the files over, update fstab, and then add the original drive to the raid1 array? Yes that. I just meant when you add the original, you don't mkfs.btrfs on it. You just add it, mkfs is implied when adding. Convert is stable and does get attention if bugs are found and seems to be reliable. But there could still be edge cases, mainly because there's not tons of aged ext4 file systems being converted. > > As far as balancing, I wasn't sure it was helpful but was thinking of just spreading the data around :) For the odd drive case, and where you're adding one drive to Btrfs raid1, best to do a balance. It won't equally spread the data around, it favors the drive(s) with the most free space. Once they all have the same amount of free space, the allocator takes turns among them to try to maintain equal free space. -- Chris Murphy _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx
