RN214 Firmware 6.9.1 - No Volumes Exist

Hello,

I have been running a ReadyNAS RN214 since ~March 2016 with three WD Red Pro 3TB drives (WDC WD4001FFSX-68JNUN0) in X-RAID configuration (RAID 5). I recently updated to firmware 6.9.1 from 6.9.0. The single data volume recently reached 80% capacity - I was planning to add a 4th drive this month. I have been doing disk maintenance on a monthly schedule (defrag, balance, scrub, disk checks, all once per month).

Sometime today I stopped being able to write to the SMB shares as well as the AFP Time Machine share. I could still read from all shares. Thinking this was a permissions issue, I tried resetting the permissions on the shares. This threw errors- " Failed to change permission and ownership of the share". I then tried a reboot through the web GUI. When the unit powered on, I received the error "No volumes exist". This picture shows the Volumes page in the web GUI:

(Before today I was running with a single data volume using the 3 disks.)

I SSH'd into the RN214 and ran short disk tests on all three drives using smartctl (invocation: "smartctl --test=short /dev/sdX)", and all three of them passed. I am running "long" tests now. Per a different forum post on this issue I tried mounting the volume in readonly, recovery mode with the following fstab entry: "LABEL=119c1b84:data /data btrfs defaults,ro,recovery 0 0". This did not allow the volume to mount after another reboot through the web GUI. There are no blinking LEDs on the unit - the LEDs are lit normally.

I can send logs upon request. I've pasted below some relevant lines from dmesg after booting with the fstab entry shown above:

[   22.120698] md: md127 stopped.

[   22.121803] md: bind<sdb3>

[   22.122033] md: bind<sdc3>

[   22.122267] md: bind<sda3>

[   22.124225] md/raid:md127: device sda3 operational as raid disk 0

[   22.124233] md/raid:md127: device sdc3 operational as raid disk 2

[   22.124239] md/raid:md127: device sdb3 operational as raid disk 1

[   22.125161] md/raid:md127: allocated 3240kB

[   22.125221] md/raid:md127: raid level 5 active with 3 out of 3 devices, algorithm 2

[   22.125226] RAID conf printout:

[   22.125232] --- level:5 rd:3 wd:3

[   22.125238] disk 0, o:1, dev:sda3

[   22.125243] disk 1, o:1, dev:sdb3

[   22.125248] disk 2, o:1, dev:sdc3

[   22.125403] md127: detected capacity change from 0 to 7991637573632

[   22.485486] Adding 523708k swap on /dev/md1.  Priority:-1 extents:1 across:523708k

[   22.506940] BTRFS: device label 119c1b84:data devid 1 transid 789057 /dev/md127

[   22.669799] BTRFS info (device md127): enabling auto recovery

[   22.672132] BTRFS critical (device md127): unable to find logical 68648173568 len 4096

[   22.672144] BTRFS critical (device md127): unable to find logical 68648173568 len 4096

[   22.672192] BTRFS critical (device md127): unable to find logical 68648173568 len 4096

[   22.672203] BTRFS critical (device md127): unable to find logical 68648173568 len 4096

[   22.672243] BTRFS critical (device md127): unable to find logical 68648173568 len 4096

[   22.672251] BTRFS critical (device md127): unable to find logical 68648173568 len 4096

[   22.672265] BTRFS error (device md127): failed to read chunk root

[   22.734127] BTRFS error (device md127): open_ctree failed

Thanks for looking!

EOM