2011/5/1 cwillu <cwillu@xxxxxxxxxx>: > On Sun, May 1, 2011 at 12:33 PM, Claes GyllenswÃrd <letharion@xxxxxxxxx> wrote: >> I've tried setting up a raid1 on two drives like this: >> >> mkfs.btrfs -m raid1 -d raid1 /dev/sdb /dev/sdc >> >> Then I copy my old install onto the new drives, and check the drives' status: >> >> # mount | grep "on / " >> /dev/sdb on / type btrfs (rw,noatime) >> # btrfs fi df / >> Data, RAID1: total=259.00GB, used=256.64GB >> Data: total=8.00MB, used=0.00 >> System, RAID1: total=8.00MB, used=44.00KB >> System: total=4.00MB, used=0.00 >> Metadata, RAID1: total=4.50GB, used=1.27GB >> Metadata: total=8.00MB, used=0.00 >> # btrfs fi show >> Label: none Âuuid: c6c89292-ea29-484c-ad29-9003a5fedf90 >>    ÂTotal devices 2 FS bytes used 257.93GB >>    Âdevid  Â1 size 931.51GB used 263.53GB path /dev/sdb >>    Âdevid  Â2 size 931.51GB used 263.51GB path /dev/sdc >> >> Label: none Âuuid: 6f2f8317-3012-4e79-a82d-ab2e8eaa6cd6 >>    ÂTotal devices 1 FS bytes used 354.99GB >>    Âdevid  Â1 size 465.65GB used 465.65GB path /dev/sda2 >> >> My interpretation of the above data is that /dev/sdb and /dev/sdc are >> exact mirrors of each other, and contain my / root partition. >> >> This would make complete sense if it wasn't for the fact that I've >> copied all the data from /dev/sda2 onto /dev/sdb. From the information >> above, it looks like the data has been split like in raid-0, instead >> of the what I expect, mirrored like in raid-1. >> >> I tried reading the FAQ about "Why are there so many ways to check the >> amount of free space?" hoping this would make it more clear, but it >> doesn't. Can anyone tell me what's going on? >> >> I found one thread with a similar question that went unanswered, and >> it was also back in 2008 so the answer might differ quite a bit >> anyway. > > How did you copy it exactly? ÂI see 100gb missing, which makes me > wonder if you maybe had subvolumes on sdb, and used the -x option to > rsync or similar: Âsubvolumes count as different mounts for the > purposes of --one-file-system'like options. > > Can you provide the df -h output for both filesystems, as well as the > btrfs fi df for /dev/sda2? > The total reported by du -sh for each would be useful as well as a sanity check. > My apologies, it appears that I've made a mistake and mixed up my numbers. Your remark that I was missing 100gb made me re reformat the raid and copy over my data again. This time everything looks as expected. Thank you for your time. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
