Suspected hard drive fail - now blue flashing light - please help

I have a My Cloud EX2 setup in Raid and have been using to backup another failed/failing drive. The EX2 now has all my data. Just at the end of many hours of backing up it started whining loud and sounded like a disk was failing. Disk 1 went red. Dashboard status was ‘Degraded’. I did a reboot from the dashboard in the hope I could remove the bad drive. It spent a long time loud seemingly booting and rebooting, powering up and down and now the red light of the bad drive has gone out and the (loud) drive has stopped. The power blue light is now fast flashing and the drive 2 is intermittently blue with some normal noise every 10 secs or so. I cannot access the dashboard.

What is it doing, if anything? I was thinking it might be rebuilding or something after logically removing the bad drive? Is that even possible? Do I pull the plug while it is in this state or let it run longer, if so how long? Should it not just boot into the OS before anything else? Please help, I don’t see the point in having a 2 drive RAID and one fails and I cannot access anything. This is the second HDD failure in 2 days, the first seeming compounding this one, but this one has all of my digital photos.

Update: It has now now gone both lights red and allowed me to login to the dashboard. Drive 1 saying BAD, drive 2 saying good. I cannot access any data via mapped my usual drives. RAID Profile says ‘No configured volumes’. The error says to replace a drive so I will try and get a hold of the same HDD. I have turned it off but it is worrying that there is no detail in the RAID profile at all and no further explanation in the error message about what to expect when this happens. Would it be safer to remove the good drive and try and mount it as a drive on my PC with an enclosure?

Yes; I think you need to think about data recovery.

Can you SSH into the unit? And if so. . .can you see files using something like WinSCP?

If you can’t do that. . .I would go the enclosure route. Note that the native format of the disk will be EXT4; which will require Linux reader software to access with a PC