19.09.2017 14:49, Senén Vidal Blanco пишет: > Perfect!! Just what I was looking for. > Sorry for the delay, because before doing so, I preferred to test to see if > it > actually worked. > > I have a doubt. The system works perfectly, but at the time of deleting the > writing disk and merging the data on the read-only disk I fail to understand > the process. > > I have tried to remove the seed bit on disk A and delete the write B as you > mention, and so move the data to A, but tells me that disk B does not exist. > These are the orders I have made: > > md127-> A > md126-> B > > btrfstune -S 0 /dev /md127 > mount /dev/md127 /mnt (I mount this disk since the md126 gives error) > btrfs device delete /dev/md126 /mnt > ERROR: error removing device '/dev/md126': No such file or directory > > Another thing I've tried is to remove disk B without removing the seed bit, > but it gives me the error: > > ERROR: error removing device '/dev/md126': unable to remove the only > writeable > device. > > Any ideas about it?
Yes, sorry about it. Clearing seed flag on device invalidates filesystem. What you can do, is to rotate devices. I.e. remove /dev/md126, set seed flag on md127 and add md126 back. I actually tested it and it works for me. > Thank you very much for the reply. > Greetings. > > El martes, 12 de septiembre de 2017 6:34:15 (CEST) Andrei Borzenkov escribió: >> 11.09.2017 21:17, Senén Vidal Blanco пишет: >>> I am trying to implement a system that stores the data in a unit (A) with >>> BTRFS format that is untouchable and that future files and folders created >>> or modified are stored in another physical unit (B) with BTRFS format. >>> Each year the new files will be moved to store A and start over. >>> >>> The idea is that a duplicate of disk A can be made to keep it in a safe >>> place and that the files stored there can not be modified until the >>> mixture of (A) and (B) is made. >> >> This can probably be achieved using seed device. Mark original device as >> seed and all changes will go to another writable device, similar to >> overlay; then remove seed bit from original device, "btrfs device remove >> writable" device and it should relocate its content back. Rinse and repeat. >
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