Forum Discussion

Aspirant

Jan 23, 2022

ReadyNas NV+ RND4000 Kernel Panic

Hi, I was wondering if you oculd help with my ReadyNAS NV+ RND4000 Basically, it's the kernel panic issue, however, when I remove one specific drive, it does boot up, and I can access the web ad...

StephenB

Guru - Experienced User

Jan 24, 2022

stuinternat wrote:

All the drives are the exact same make and model.

Ok. So we have

one disk which is apparently ok
one disk which is on the edge of failure (~500 bad sectors)
one disk which won't respond to smart requests
one disk with unknown status (system won't boot with it inserted)

You need 3 working disks to retrieve all data - it's not clear to me whether you have that or not.

I do suggest testing the two last disks in my list with WDC's dashboard software. My guess is that the one that isn't responding to SMART will fail, but it would be useful to confirm. Odds of recovering data would be much higher is the one you removed turns out to be ok.

stuinternat

Aspirant

Jan 24, 2022

Okay, so I have taken out the disk that was at the edge of failure, inserted the removed disk, and the system is now loading, it is doing a FS check, and is currently at 94%, so hopefully with these 3 disks I may be able to retrieve my data?

So odd, because it was working just 2 days ago.

Once in, and assuming it does not do a kernel panic, I'll export all logs and maybe we can see what is the status of the other disk.

So, here is what I know so far in a table.....

Serial	24-01-22	25-01-22	Reallocated_Sector_Ct	Reallocated_Event_Count	Current_Pending_Sector	Comment
WD-WCAZA6665747	4	4	8	7	486	Edge of failure
WD-WCAZA6662505	3	3	0	0	0	Okay
WD-WCAZA6666340	1	out of box	no data	No Data
TBD	out of box	1	TBD	TBD

StephenB
Guru - Experienced User
Jan 24, 2022
stuinternat wrote:

Okay, so I have taken out the disk that was at the edge of failure, inserted the removed disk, and the system is now loading, it is doing a FS check, and is currently at 94%, so hopefully with these 3 disks I may be able to retrieve my data?

Hopefully yes.

If you do see the data, you should immediately off-load it. WCAZA6665747 is definitely on borrowed time.
stuinternat
Aspirant
Jan 24, 2022
Okay, so now I'm online?
stuinternat
Aspirant
Jan 24, 2022
Yep, I have my data, moving it now - hope it doesn't fail.
Does this mean that WD-WCAZA6666340 is dead because of no SMART data?

...and THANK YOU SO MUCH
I actually ordered an extra drive to resolve this, hoping that putting it in would rebuild the array, I guess I don't need that now? Or should I add it to help with copying off the data?
Also, it says I am redundant, but I don't see how I can be with 3 disks in. The system won't work with just 2 will it?
StephenB
Guru - Experienced User
Jan 25, 2022
stuinternat wrote:

Yep, I have my data, moving it now - hope it doesn't fail.

Does this mean that WD-WCAZA6666340 is dead because of no SMART data?

Something definitely went wrong when the system tried to query the SMART data.

After you off-load the data, I recommend testing all the drives in a Windows PC with WD's dashboard (running the long generic test). You might need to purchase a usb adapter/dock (which are inexpensive).

stuinternat wrote:

Also, it says I am redundant, but I don't see how I can be with 3 disks in. The system won't work with just 2 will it?

No, it won't. Not sure why it thinks it's redundant.

stuinternat wrote:
I actually ordered an extra drive to resolve this, hoping that putting it in would rebuild the array, I guess I don't need that now?

You might, depending on how the disk tests come out.