Greetings,
Warning: Btrfs user here; no knowledge of the inside working of btrfs.
If I am in the wrong mailing list, please redirect me and accept my
apologies.
At home, lacking of disks and free SATA ports, I created a raid1 btrfs
filesystem by converting an existing single btrfs instance into a
degraded raid1, then added the other driver. The exact commands I used
have been lost.
Worked well, until one of my drive died. Total death; the OS does not
detect it anymore. I bought another drive, but alas, I cannot add it:
# btrfs replace start -B 2 /dev/sdd /mnt/brtfs-raid1-b
ERROR: ioctl(DEV_REPLACE_START) failed on "/mnt/brtfs-raid1-b":
Read-only file system
Here is the command I used to mount it:
mount -t btrfs -o ro,degraded,recovery,nosuid,nodev,nofail,x-gvfs-show
/dev/disk/by-uuid/975bdbb3-9a9c-4a72-ad67-6cda545fda5e
/mnt/brtfs-raid1-b
If I remove 'ro' from the option, I cannot get the filesystem mounted
because of the following error:
BTRFS: missing devices(1) exceeds the limit(0), writeable mount is not
allowed
So I am stuck. I can only mount the filesystem as read-only, which
prevents me to add a disk.
It seams related to bug:
https://bugzilla.kernel.org/show_bug.cgi?id=60594
I am using Ubuntu 16.04 LTS with kernel 4.4.0-59-generic. Is there any
hope to add a disk? Else, can I recreate a raid1 with only one disk and
add another, but never suffer from the same problem again? I did not
lost any data, but I do have some serious downtime because of this. I
wish that if a drive fail, the btrfs filesystem still mounts rw and
leave the OS running, but warns the user of a failing disk and easily
allow the addition of a new drive to reintroduce redundancy. However,
this scenarios seams impossible with the current state of affair. Am I
right?
Best regards and thank you for your contribution to the open source
movement,
Hans Deragon
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