Hello,
Not sure if this is a reportable bug, so I figured I'd start on the
mailing list and then report a bug if it is a bug and not user error.
Here is the original state of a RAID1 in which I wanted to replace the
smaller drive (except the /dev/sdX was different):
btrfs filesystem show
Label: 'Photos' uuid: 27cc1330-c4e3-404f-98f6-f23becec76b5
Total devices 2 FS bytes used 2.56TiB
devid 1 size 2.73TiB used 2.57TiB path /dev/sde1
devid 2 size 3.64TiB used 2.57TiB path /dev/sdb1
I added a 6TB HD to the system via a Zalman "toaster"-like external
hard drive via USB2.0. I ran the command:
btrfs replace start -f 1 /dev/sdl /media/Photos/
For some reason - perhaps pertaining to the USB enclosure having
errors, I ended up with this as the output of status:
Started on 29.Nov 21:32:46, canceled on 29.Nov 21:52:31 at 0.0%,
236415 write errs, 0 uncorr. read errs
So I moved the computer inside by disconnected an optical drive and
connected the drive via its SATA data and power cables. The system now
recognizes it as /dev/sda.
When I do a btrfs fi show, I get the same output as above.
But when I try to go again:
btrfs replace start -f 1 /dev/sda /media/Photos/
ERROR: /dev/sda is mounted
And when I do a dmesg | grep sda
[ 1.448727] sd 0:0:0:0: [sda] Attached SCSI disk
[ 3.920449] BTRFS: device label Photos devid 0 transid 158105 /dev/sda
btrfs device delete 0 /media/Photos/
ERROR: error removing devid 0: unable to go below two devices on raid1
I tried reformatting the drive, but still have this issue. Here are
some outputs of commands I ran:
# umount /media/Photos
# btrfs check --readonly /dev/sda
parent transid verify failed on 3486916509696 wanted 158105 found 158107
parent transid verify failed on 3486916509696 wanted 158105 found 158107
parent transid verify failed on 3486916509696 wanted 158105 found 158107
parent transid verify failed on 3486916509696 wanted 158105 found 158107
Ignoring transid failure
Checking filesystem on /dev/sda
UUID: 27cc1330-c4e3-404f-98f6-f23becec76b5
checking extents
checking free space cache
checking fs roots
checking csums
checking root refs
ERROR: transid errors in file system
found 2816405245952 bytes used err is 1
total csum bytes: 2746708244
total tree bytes: 3087089664
total fs tree bytes: 180305920
total extent tree bytes: 40058880
btree space waste bytes: 106866688
file data blocks allocated: 3245113991168
referenced 3179709394944
# btrfs fi show
Label: 'NotHome' uuid: 09344d53-db1e-43d0-8e43-c41a5884e172
Total devices 1 FS bytes used 1.79TiB
devid 1 size 3.64TiB used 1.81TiB path /dev/sdd1
Label: 'Home1' uuid: 89cfd56a-06c7-4805-9526-7be4d24a2872
Total devices 1 FS bytes used 949.91GiB
devid 1 size 2.73TiB used 1.65TiB path /dev/sdc1
Label: 'Photos' uuid: 27cc1330-c4e3-404f-98f6-f23becec76b5
Total devices 2 FS bytes used 2.56TiB
devid 1 size 2.73TiB used 2.57TiB path /dev/sde1
devid 2 size 3.64TiB used 2.57TiB path /dev/sdb1
Label: none uuid: 659edd01-d563-4e7e-b8a7-5b192b814381
Total devices 1 FS bytes used 112.00KiB
devid 1 size 5.46TiB used 2.02GiB path /dev/sda1
# btrfs replace start -f 1 /dev/sda /media/Photos/
ERROR: /dev/sda is mounted
# btrfs fi show
Label: 'NotHome' uuid: 09344d53-db1e-43d0-8e43-c41a5884e172
Total devices 1 FS bytes used 1.79TiB
devid 1 size 3.64TiB used 1.81TiB path /dev/sdd1
Label: 'Home1' uuid: 89cfd56a-06c7-4805-9526-7be4d24a2872
Total devices 1 FS bytes used 949.95GiB
devid 1 size 2.73TiB used 1.65TiB path /dev/sdc1
Label: 'Photos' uuid: 27cc1330-c4e3-404f-98f6-f23becec76b5
Total devices 2 FS bytes used 2.56TiB
devid 1 size 2.73TiB used 2.57TiB path /dev/sde1
devid 2 size 3.64TiB used 2.57TiB path /dev/sdb1
Label: none uuid: 659edd01-d563-4e7e-b8a7-5b192b814381
Total devices 1 FS bytes used 112.00KiB
devid 1 size 5.46TiB used 2.02GiB path /dev/sda1
# cat /proc/mounts | grep sda
#
# btrfs dev usage /media/Photos/
/dev/sdb1, ID: 2
Device size: 3.64TiB
Device slack: 0.00B
Data,single: 1.00GiB
Data,RAID1: 2.56TiB
Metadata,single: 1.00GiB
Metadata,RAID1: 5.00GiB
System,single: 32.00MiB
System,RAID1: 32.00MiB
Unallocated: 1.07TiB
/dev/sde1, ID: 1
Device size: 2.73TiB
Device slack: 0.00B
Data,RAID1: 2.56TiB
Metadata,RAID1: 5.00GiB
System,RAID1: 32.00MiB
Unallocated: 166.49GiB
There appears to be some kind of weird situation going on:
# btrfs device remove /dev/sda /media/Photos/
ERROR: error removing device '/dev/sda': unable to go below two
devices on raid1
# btrfs device remove /dev/sdb /media/Photos/
ERROR: error removing device '/dev/sdb': unable to go below two
devices on raid1
# btrfs device remove /dev/sde /media/Photos/
ERROR: error removing device '/dev/sde': unable to go below two
devices on raid1
who (filesystem? disk? some program?) maintains the info on what was
going on with /dev/sda? I feel like there's some kind bit I need to
clear and then it'll work correctly.
---
So my question is two-fold.
1) Where do I go from here to get things working for me? I have my
photos on these drives (which is why I went RAID1 so I could have high
availability backup-ish situation) so I don't want to do anything
destructive to the two drives currently working fine in the array.
2) The fact that a failed replace left the (system|disks|filesystem)
thinking that the drive is both part of and not part of the RAID1 -
does that need to be reported as a bug?
--
Eric Mesa
http://www.ericmesa.com
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