Forum Discussion

Aspirant

May 14, 2019

RN212 - Removed one disk, now cant see data on remaining disk

I've added an eda500 to my rn314 and want to migrate disks & data from the old rn212.

I powered the rn212 down and removed one disk. I then added this to the EDA500 and set up a new volume on it.

The intention was to then create the shares and copy the data, before taking the remaining disk out of the RN212 and adding it to the EDA500 to re-mirror.

However... When I started the RN212 with one disk in, it boots as a new device and I cant access the disk. It reports "your readynas booted with dsiks that where previously used in another type of device" The only option is to format the disk.

Why has this happended, and is there anything I can do to access the data? I do have a backup, but am concerned that this has occured, I would expect this to be ok? i.e if disk fails when nas off, then it should start ok with just one disk?

Thanks for any insight

Paul

18 Replies

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Sandshark
Sensei - Experienced User
May 14, 2019
What kind of volume did you have? If it was RAID0 or JBOD, you can't remove one drive and retain data on the other.
- Paul_Thomas
  Aspirant
  May 14, 2019
  Hi,
  
  It was a 2 disk mirror (x-raid). If I go into the volumes tab, theres a message "remove inactive volumes to use disk. Disk #2"
  
  I would expect everything to work fine with one mirror removed, it should just be degradded.
  
  Thanks
  - Sandshark
    Sensei - Experienced User
    May 14, 2019
    That is the expectation. But waiting until you already re-formatted the second drive before checking the first would give you a degraded volume was not your best choice. Best would have been to remove the drive with power on. Second best would be to at least re-boot before re-formatting.
    
    It appears that something did get corrupted on your drive and it now no longer has the other to recover from. On the outside chance it's just the OS partition, you can try an OS re-install.