ReadyNAS Duo v2 won't boot with disk light continuously blinking

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simon0117 wrote:
Xraid. I don't think I can call support, this duo is very old.

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You could still try paid support via my.netgear.com.

Are you sure you have a duo v2?  The labels are confusing, and many v1 owners mistakenly think they have a v2.  Read this guide before replying: http://www.rnasguide.com/2012/01/09/how-to-tell-whether-i-have-a-duo-v1-or-duo-v2-or-nv-v1-or-nv-v2/

Do you see one of the blinking led patterns below?

LED blink behavior for 2 disk systems is three quick blinks of all disk LEDs and the backup LED, followed by an 1s delay, followed by a number of slow blinks.  The number of slow blinks will be the error code.

Current error codes:
1  - Vendor mismatch
2  - No disks detected
3  - Bad contents on root partition of disks
4  - Flash error
5  - Unsupported RAID configuration

 Though from your description it sounds like one of the drives has failed.  Try powering down, removing disk 2 again, and then restarting.  Then download the log zip from the web ui and look at the SMART status for the disks.  You might also test both disks with vendor diags in a Windos PC (lifeguard for western digital, seatools for seagate).