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READY NAS 3312 Filled with Snapshots

valeroso
Aspirant

Re: READY NAS 3312 Filled with Snapshots

The mount is not successful

 

mount: wrong fs type, bad option, bad superblock on /dev/md127,
missing codepage or helper program, or other error

In some cases useful info is found in syslog - try
dmesg | tail or so.

 

Checking dmesg | tail gives below output

 

BTRFS error (device md127): Remounting read-write after error is not allowed

Message 26 of 31
StephenB
Guru

Re: READY NAS 3312 Filled with Snapshots


@valeroso wrote:

BTRFS error (device md127): Remounting read-write after error is not allowed


Ok.  That command worked on one of my ReadyNAS, although /data was already mounted read/write.

 

Part of the puzzle here is figuring out why /data was mounted read-only when you booted - e.g. what that error was.  Have you tried looking in the log zip?  There might be some clues in there.

 

Another path is to open a support ticket, and have Netgear take it from here.

Message 27 of 31
valeroso
Aspirant

Re: READY NAS 3312 Filled with Snapshots

Looks like a support ticket with Netgear might be the way to go.

 

One final question though, is there any possibility that the RAID type(6) has any role to play on this?

Message 28 of 31
Sandshark
Sensei

Re: READY NAS 3312 Filled with Snapshots

I had a volume that went read-only because of an error.  It took a couple minutes from boot before it went from read-write, so have you tried to jump in really fast and try the deletion?  The log should say when it went read-only, so you can see if there is a window of opportunity there.

 

If you are using Putty, you can re-start the session and the command will still be in the buffer to cursor up and quickly re-execute.

 

Of course, if it's something else causing it to go read-only other than being full, you'll probably still end up needing to destroy the volume and restore from backup (I did).  And doing that would also solve your snapshot problem (though take a long time).

Message 29 of 31
valeroso
Aspirant

Re: READY NAS 3312 Filled with Snapshots

Just to provide feedback.

 

I copied out all I could from the shares and then destroyed the volume.

 

I have created a new volume and I am hoping the issue doesn't reoocur.

 

Message 30 of 31
StephenB
Guru

Re: READY NAS 3312 Filled with Snapshots


@valeroso wrote:

I have created a new volume and I am hoping the issue doesn't reoocur.


A couple of followups...

 

I do suggest running the maintenance tasks (disk test, balance, scrub, defrag) that you'll find on the volume settings wheel.  I run each one once every 3 months on my own NAS.  Also, I suggest periodically looking at the SMART stats in the log zip file.  OS 6 uses higher thresholds for reallocated/pending sectors than I am comfortable with, and unfortunately those thresholds can't be changed.

 

If you do use snapshots (which I do), I recommend using the Custom setting (not the SMART setting).  Then set a retention period.  Unfortunately the SMART snapshots keep the monthly snapshots forever - which will eventually fill the NAS.  I find that setting retention to 3 months provides a good balance between recovery of old files and the snapshot storage usage.  Though that will depend on your usage.  You can adjust the retention for each share.

 

Most importantly: RAID isn't enough to keep your data safe.  The only way to do that is to have at least one backup on another device.  So consider putting a backup plan in place.

Message 31 of 31
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