What happen to data when adding a second disk?

My Cloud OS 3 Personal & Network Attached Storage My Cloud EX2
1

Hello Community,

I was using my NAS with just one disk inside formatted in JBOD.
Having bought a new disk (same model and size as first one), I wonder what will happen to data (photos, videos,…) on first disk when I will plug the new one to free slot. I plan to make a RAID1 configuration.
Any idea? Should I backup every thing first or is it 100% safe?

2

I would definitely backup your data. My understanding is that whenever you change the raid configuration the disks are formatted. Perhaps someone here can confirm that.

3

Many thanks for your reply.
I do have backed up important personal files but I am lazy for remaining ones…
Anyway a regular backup on another storage device would be wise…

Meanwhile I asked question to WD support, I will share answer if any.

4

Hey,
Just had feedback from WD support… All data will be wiped!
Be warned!
Bye

5

Yes but doing another JBOD wont. If its NAS certified dont do raid. Unless its so official materials costing you fortune if you loose it.

6

Indeed the question is worth being discussed as I am going to backup data on an external device.
In that case a RAID1 configuration is maybe a bit too much. Actually it also depends of the regularity of these external backups.
Thank you for your input, I have to think about it.

7

RAID 1 is not a backup; it’s a fault-tolerance method for data protection. The volume itself can still get corrupted and the RAID controller can fail. As such, a backup (A secondary copy available at the same time in a separate, independent location) is still recommended.

8

I doubt it. RAID 1 hardly fails. As its double copy of the data inside 2 hdd. So if either fails which fails RAID 1 still 1 hdd activate enough to retrieve the data. or rebuild the data.

Even if the raid corrupted it can be rebuild by inserting the new hdd or so.

9

There are two possibile options with RAID 1:

  1. Switch to RAID 1
  2. Migrate to RAID 1

what are the meaning?