ReadyNas 6 locked up and now array is inactive

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StrawDragon wrote:

 

So I have two logical volume md126 and md127, how does it combine two virtual volumes? Does it use raid0? as parity is across each drive?

 

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No RAID0. The file system (BTRFS in this case) spans two virtual disks, and the file system decides what it will put on each one. md126 and md127 each have their own (independent) RAID parity.  This is standard RAID-5, so the parity blocks are evenly distributed across all your physical disks.

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StrawDragon wrote:

I am not asking for a data recovery, I should be able to pay per incident for them

 

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FYI, neither Sandshark nor I work for Netgear.  I was just presenting your options.  Unfortunately, Netgear no longer offers pay-per-incident support.

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StrawDragon wrote:

There was no drive failure and smart shows 0 errors on the 6 drives.

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Please download the full log zip from the logs page. Then look for btrfs errors in kernel.log. I am thinking you will see some errors like "parent transid verify failed", followed by "failed to read log tree" and "open_ctree failed". 

If you don't see this, then someone should probably analyze your logs for you.

If you do see this, then note the device in the error (I think it will be md126, but it's possible it will be md127).  Then try this command

btrfs rescue zero-log /dev/md12X

(using the same device that appears in the kernel.log entry).

This should give some more messages like "parent transid verify failed", and then say it is clearing the log on /dev/md12X If it does, then reboot the NAS and see if the volume mounts.