On 14/10/2015 16:40, Anand Jain wrote: >> # mount -o degraded /var >> Oct 11 18:20:15 kernel: BTRFS: too many missing devices, writeable >> mount is not allowed >> >> # mount -o degraded,ro /var >> # btrfs device add /dev/sdd1 /var >> ERROR: error adding the device '/dev/sdd1' - Read-only file system >> >> Now I am stuck: I cannot add device to the volume to satisfy raid >> pre-requisite. > > This is a known issue. Would you be able to test below set of patches > and update us.. > > [PATCH 0/5] Btrfs: Per-chunk degradable check
Many thanks for the reply. Unfortunately I have no environment to recompile the kernel, and setting it up will perhaps take a day. Can the latest kernel be pushed to Debian sid? 1. Is there any way to recover btrfs at the moment? Or the easiest I can do is to mount ro, copy all data to another drive, re-create btrfs volume and copy back? 2. How to avoid such a trap in the future? 3. How can I know what version of kernel the patch "Per-chunk degradable check" is targeting? 4. What is the best way to express/vote for new features or suggestions (wikipage "Project_ideas" / bugzilla)? Thanks! -- With best regards, Dmitry -- 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
