Hello, - I have a ReadyNas -> Netgear RNDU2120-100PES (check image below). - It has a "blue light" - but the network port NIC seems totally dead. Not link at all. So my guess unit works well but the NIC port has crashed. - Its two disks in the drive two 2TB disks. - My plan is this - and wanted to double check with support first before i do this: Step 1) Complete > I have cloned one of the drive to a copy - so i am not working on the original drive. Step 2) Complete >I have connected the cloned drive to PC / Linux Debian wheezy. Step 3) Complete >I can see the device in fdisk however i cant mount it - it needs "mdadm" i understand. Step 4) Not yet > I am about to do this: Install "mdadm" and "vgscan" and run: # mdadm --assemble --scan# vgscan# vgchange -a y# mount /dev/c/c /mnt Since that is what i have found out that i should do in this forum. Is this correct? Then i will proceed. Any input/help is most welcomed - need to urgently recover data. Best regards, Johan

You have an Ultra-2, not an RN102 - so your title isn't correct. Your command sequence looks ok.

Fixed the thread title. It's advisable to check disk health and the state of the RAID array before proceeding to run the commands you mentioned.

Hello mdgm, - Can you update me on the commands i should run to check the "helath and state of RAID array" ? - Also note - > i have one of the disks attached to a PC - should i attach both disk? Best regards,Johan

Hello Again, - I know ran the commands:# mdadm --assemble --scan# vgscan# vgchange -a y# mount /dev/c/c /mnt But cant seem to mount the drive- error "unknown filesystem type 'linux_raid_member". Note i have one of the two disks - connected to the PC. Look at images below:

# mount -o ro -t ext4 /dev/c/c /mnt

Forum Discussion

divisionmd

Aspirant

Nov 15, 2016

ReadyNAS Ultra 2: how to recover data from RAID-1 disks?

Hello,

- I have a ReadyNas -> Netgear RNDU2120-100PES (check image below).

- It has a "blue light" - but the network port NIC seems totally dead. Not link at all. So my guess unit works well but the NIC port has crashed.

- Its two disks in the drive two 2TB disks.

- My plan is this - and wanted to double check with support first before i do this:

Step 1) Complete > I have cloned one of the drive to a copy - so i am not working on the original drive.

Step 2) Complete >I have connected the cloned drive to PC / Linux Debian wheezy.

Step 3) Complete >I can see the device in fdisk however i cant mount it - it needs "mdadm" i understand.

Step 4) Not yet > I am about to do this: Install "mdadm" and "vgscan" and run:

# mdadm --assemble --scan
# vgscan
# vgchange -a y
# mount /dev/c/c /mnt

Since that is what i have found out that i should do in this forum.

Is this correct? Then i will proceed.

Any input/help is most welcomed - need to urgently recover data.

Best regards,

Johan

Feature Request & Feedback

11 Replies

Replies have been turned off for this discussion

StephenB
Guru - Experienced User
Nov 15, 2016
You have an Ultra-2, not an RN102 - so your title isn't correct.

Your command sequence looks ok.
- mdgm-ntgr
  NETGEAR Employee Retired
  Nov 15, 2016
  Fixed the thread title.
  
  It's advisable to check disk health and the state of the RAID array before proceeding to run the commands you mentioned.
  - divisionmd
    Aspirant
    Nov 15, 2016
    Hello mdgm,
    
    - Can you update me on the commands i should run to check the "helath and state of RAID array" ?
    
    - Also note - > i have one of the disks attached to a PC - should i attach both disk?
    
    Best regards,
    Johan