On 25/10/12 22:37, Kyle Gates wrote: >> On 22/10/12 10:07, sam tygier wrote: >>> hi, >>> >>> I have a 2 drive btrfs raid set up. It was created first with a single >>> drive, and then adding a second and doing >>> btrfs fi balance start -dconvert=raid1 /data >>> >>> the original drive is showing smart errors so i want to replace it. i dont >>> easily have space in my desktop for an extra disk, so i decided to proceed >>> by shutting down. taking out the old failing drive and putting in the new >>> drive. this is similar to the description at >>> https://btrfs.wiki.kernel.org/index.php/Using_Btrfs_with_Multiple_Devices#Replacing_Failed_Devices >>> (the other reason to try this is to simulate what would happen if a drive >>> did completely fail). >> >> If i reconnect the failing drive then I can mount the filesystem with no >> errors, a quick glance suggests that the data is all there. >> >> Label: 'bdata' uuid: 1f07081c-316b-48be-af73-49e6f76535cc >> Total devices 2 FS bytes used 2.50TB >> devid 2 size 2.73TB used 2.73TB path /dev/sde1 <-- this is the drive that i >> wish to remove >> devid 1 size 2.73TB used 2.73TB path /dev/sdd2 >> >> sudo btrfs filesystem df /mnt >> Data, RAID1: total=2.62TB, used=2.50TB >> System, DUP: total=40.00MB, used=396.00KB >> System: total=4.00MB, used=0.00 >> Metadata, DUP: total=112.00GB, used=3.84GB >> Metadata: total=8.00MB, used=0.00 >> >> is the failure to mount when i remove sde due to it being dup, rather than >> raid1? > > Yes, I would say so. > Try a > btrfs balance start -mconvert=raid1 /mnt > so all metadata is on each drive.
Thanks btrfs balance start -mconvert=raid1 /mnt did the trick. It gave "btrfs: 9 enospc errors during balance" errors the first few times i ran it, but got there in the end (smaller number of errors each time). the volume is pretty full, so i'll forgive it, (though is "Metadata, RAID1: total=111.84GB, used=3.83GB" a reasonable ratio?). i can now successfully remove the failed device and mount the filesystem in degraded mode. It seems like the system blocks get convert automatically. i have added an example for how to do this at https://btrfs.wiki.kernel.org/index.php/Using_Btrfs_with_Multiple_Devices#Adding_New_Devices Thanks, Sam -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
