Hello, I'm trying to restore a subvolume from a backup, but I'm failing when I try to setup the replication chain again.
Previously I had disk A and B, where I was sending snapshots from A to B using "send -c /disk_a/1 /disk_a/2 | receive /disk_b" and so on. Now disk A failed, so I got a new disk: C. First I sent the last backup from B to C by running "send disk_b/2 | receive /disk_c/". Then my plan was to use disk B as the new main disk, so on disk B, I created a new snapshot by running "snapshot -r disk_b/2 disk_b/my_volume". Now I want to send "disk_b/my_volume" to disk C, so that I can set disk_b/2 to RW and start using it again, but the last send fails with "ERROR: cannot find parent subvolume". Disk B: root@tillberga: /backup #> btrfs subvol sh snapshots/user_data_2018-02-17/ snapshots/user_data_2018-02-17 Name: user_data_2018-02-17 UUID: 93433261-d954-9f4b-8319-d450ae079a9a Parent UUID: 51180286-c202-c94c-b8f9-2ecc8d2b5b7c Received UUID: 014fc004-ae04-0148-9525-1bf556fd4d10 Flags: readonly Snapshot(s): user_data_test Disk C: root@hedemora: /btrfs #> btrfs subvol sh user_data_2018-02-17/ user_data_2018-02-17 Name: user_data_2018-02-17 UUID: 35361429-a42c-594b-b390-51ffb9725324 Parent UUID: - Received UUID: 93433261-d954-9f4b-8319-d450ae079a9a Flags: readonly Snapshot(s): Disk B has UUID 93433261-d954-9f4b-8319-d450ae079a9a, and disk C has "Received UUID: 93433261-d954-9f4b-8319-d450ae079a9a". I think that's alright? The new snapshot on disk B looks as following: root@tillberga: /backup #> btrfs subvol sh user_data_test user_data_test Name: user_data_test UUID: bf88000c-e3a6-434b-8f69-f5ce2174227e Parent UUID: 93433261-d954-9f4b-8319-d450ae079a9a Received UUID: 014fc004-ae04-0148-9525-1bf556fd4d10 Flags: readonly Snapshot(s): But when I'm trying to send it, I'm getting the following: root@tillberga: /backup #> btrfs send -v -c snapshots/user_data_2018-02-17 user_data_test | ssh user@hedemora "sudo btrfs receive -v /btrfs/" At subvol user_data_test BTRFS_IOC_SEND returned 0 joining genl thread receiving snapshot user_data_test uuid=014fc004-ae04-0148-9525-1bf556fd4d10, ctransid=52373 parent_uuid=014fc004-ae04-0148-9525-1bf556fd4d10, parent_ctransid=52373 At snapshot user_data_test ERROR: cannot find parent subvolume Note that the receiver says "parent_uuid=014fc004-ae04-0148-9525-1bf556fd4d10". Not really sure where that comes from, but disk B has the same, so maybe that's the UUID of the original snapshot on disk A? Is it possible to continue to send incremental snapshots between these two file systems, or must I do a full sync? -- 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
