ReadyNAS Duo v2 - no disks detected

That model number is a v2 , however you are using the boot menu method for a v1. First check your model using this:
http://www.rnasguide.com/2012/01/09/how ... -or-nv-v2/

If it's a v2 , then use the boot menu instructions in the manual:

http://www.readynas.com/download/docume ... ept-11.pdf

Also, check all the disks using vendor tools.

You had backed up your data, or do you need to try to access the volume again?

Many thanks, Vandermerwe, for the very helpful post. I had thought that the Duo was a v2 based on the sticker on the underneath of the unit but it turns out it's a v1.

I've not been able to access data on the hard drives because the NAS won't boot up but presumably I could use a USB caddy for this. The drives are Seagate Barracuda 2TB so I will look on the internet for the vendor tools.

With regard to the NAS boot menu, holding the power button does not allow me to access the boot menu. Instead, the lights keep flashing (all of them 3 times quickly then the left hand '1' light flashes twice slowly). Are there any ways that I could try to investigate what is preventing it from booting?

Any advice is welcome.

Thanks.

I would certainly test all the disks including the spare.
As for your data , you may be able to read disk 1 using linux reader after attaching the disks to a PC:
http://www.diskinternals.com/linux-reader/.
This assumes you were using Xraid.
It is usually disk 1 that can be read, but in some cases can be disk 2.
If you can access the data back it up.

If all disks are ok then it sounds like there is a chassis fault. You say it is 2 years old, did you buy it new?

The blinking lights suggests that the NAS is not seeing your disks. (http://home.bott.ca/webserver/?p=324)

OP had already decoded the led pattern.