Re: Unable to mount degraded RAID5

["Tomáš Hrdina" <thomas.rkh@gmail.com>]

Result from dmesg:
http://sebsauvage.net/paste/?4e8e95b5eafbf675#ybToBzZ/WAoRjjugeH6N2YXZKEBlswaNI/J41GBmFYU=

sudo btrfs dev scan
Scanning for Btrfs filesystems

sudo btrfs fi show
warning, device 3 is missing
checksum verify failed on 12678831570944 found 3DC57E3E wanted 771D2379
checksum verify failed on 12678831570944 found 3DC57E3E wanted 771D2379
bytenr mismatch, want=12678831570944, have=10160133442474442752
Couldn't read chunk tree
Label: none  uuid: 2dab74bb-fc73-4c47-a413-a55840f6f71e
        Total devices 3 FS bytes used 3.80TiB
        devid    1 size 3.64TiB used 1.92TiB path /dev/sdb
        devid    2 size 3.64TiB used 1.92TiB path /dev/sda
        *** Some devices missing

sudo blkid
/dev/sda: UUID="2dab74bb-fc73-4c47-a413-a55840f6f71e"
UUID_SUB="7262d027-202a-4b29-aaf8-0bb8cf107d4d" TYPE="btrfs"
/dev/sdb: UUID="2dab74bb-fc73-4c47-a413-a55840f6f71e"
UUID_SUB="afa4cff8-d037-472e-9eb1-070d331b6a20" TYPE="btrfs"
/dev/sdc1: UUID="6731963f-5bf9-458c-a44d-6f0bbea38357" TYPE="ext2"
PARTUUID="ccb00f7e-01"
/dev/sdc5: UUID="522XeT-jWNr-O0oG-HeHV-akQu-AR3P-fzeUAy"
TYPE="LVM2_member" PARTUUID="ccb00f7e-05"
/dev/sdd1: LABEL="Verbatim HDD" UUID="70947DE1947DAA6C" TYPE="ntfs"
PARTUUID="58334162-01"
/dev/mapper/uncik--srv--vg-root:
UUID="15b50e38-d4cc-454c-ba0f-80adbb4cd4e1" TYPE="ext4"
/dev/mapper/uncik--srv--vg-swap_1:
UUID="c9db5981-acc3-43bb-a209-a213b80cc9cb" TYPE="swap"

sudo btrfs check /dev/sda
warning, device 3 is missing
checksum verify failed on 12678831570944 found 3DC57E3E wanted 771D2379
checksum verify failed on 12678831570944 found 3DC57E3E wanted 771D2379
bytenr mismatch, want=12678831570944, have=10160133442474442752
Couldn't read chunk tree
Couldn't open file system
 
Thank you
Tomas


------------------------------------------------------------------------

 *From:* Chris Murphy
 *Sent:*  Monday, July 04, 2016 9:01PM
 *To:* Tomáš Hrdina, Btrfs Btrfs
 *Subject:* Re: Unable to mount degraded RAID5

On Mon, Jul 4, 2016 at 12:54 PM, Tomáš Hrdina <thomas.rkh@gmail.com> wrote:
> Degraded gives same result:
> 
> sudo mount -t btrfs -o ro,degraded /dev/sda /shares
> mount: wrong fs type, bad option, bad superblock on /dev/sda,
>        missing codepage or helper program, or other error
> 
>        In some cases useful info is found in syslog - try
>        dmesg | tail or so.
> 

That's bad. What are the kernel messages for the mount attempt?

Do the following and report back all the results.

# btrfs dev scan
# btrfs fi show
# blkid
# btrfs check /dev/sda


Also, make sure you reply to the btrfs list also and not just to me
personally. And also don't top post or it'll annoy some people on the
list.




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