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Forum Discussion
Error: btrfs_merge_bio_hook+a0 #26746663
I have a issue with my RN104 running OS 6.4.2. It appeared to be working fine on Thursday night. Friday morning the unit was inaccessible. The display panel shows btrfs_merge_bio_hook+a0. The uni...
Hi Brian - I don't have a backup, I have about 12TB of data stored, that's hard to backup with out having a 2nd NAS. I had hoped that a RAID system would be sufficient.
You're the second support person to suggest a USB boot recovery, but the firmware seems intact as the unit boots correct with different drives and even removing one of the four drives in the array set the unit boots, it just doesn't recognize the drives as being members of a valid array. Although admittedly I don't know how the NetGear NAS functions, so I could easily be incorrect and the USB boot recovery would help. However, Ken the person who has been responding to e-mail agreed that a USB Boot Recovery would probably not be helpful.
I did try to boot into Read Only mode, that didn't work, I get the same error.
Hi Nasgul,
Could you share with us the ticket # you got from NETGEAR support? If you will go back to Boot Menu and select Telnet (techsupport) mode, will it push through?
Kind regards,
BrianL
NETGEAR Community Team
HI Brian
The ticket number is #26746663. The unit does boot into Tech Support mode, the front panel says DEBUGMODE[58220] and the Unit's IP address.
The unit also appears in RAIDar with it's status listed as Tech Support Mode and the Debug Code 58220.
Your profile indicates you have a RN516 as well and your logs suggest that you moved these disks across from the RN516 only a couple of days ago, so surely you have more than one NAS?
Moving disks from an x86_64 NAS to an ARM NAS is not something we recommend. The other way makes sense (from a RN104 to a RN516 would make sense) though.
There are two disks showing as being currently installed and the data volume array is failing to start indicating that 5 out of 6 disks have failed. This would indicate that the two disks installed are not in sync with each other.
With RAID-5 you need a minimum of n-1 disks where n is the number of disks in a redundant volume and with RAID-6 you need a minimum of n-2 disks to be able to attempt data recovery. What's happened to all the other disks?Hi -
I do have a 516 as well as the 104. Ken suggested that I take the disks out of the 104 (mark them so I know their position in the array) and insert scratch drives. The purpose was to determine if the failure was firmware related or disk related. The unit booted correctly with the scratch disks, so it appears to be disk related.
The disks I had were two 3TB disks I removed from the 516, one was from a couple weeks ago. The other I replaced Friday. I had not yet zero'd them and sold them.
I did read through the logs last night. It appears that some of the data carried over from the 516 and some of the data is from the 104. So the logs probably do not provide useful information.
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