Disks from NAS Netgear RND4000. Recreating RAID.

[Marsjanin]

Hello.
I got a broken NAS: Netgear RND4000. I need to recover data from the disks.
There was 4 HDDs in it, 2 TB each. I am trying to see the content on Linux (using Mint Debian actually), connecting them all to some ATX MB that does not support (even if it does, it's disabled) RAID. All disks are visible, moreover: the Disks program can see there virtual device with 6 TB capacity, but it's not recognized and cannot be mounted.

I connected disks to SATA ports according to numbers, they got written on their labels. First three disks looks the same, and last one looks as empty disk. It's possible it was replaced for new one just before the NAS failure, but I'm not sure. There is what I got in Disks program, I clicked all partitions on each disk to expand the summary.

sccrenshots

I installed also mdadm but I'm not sure what to do there. What should I do now to get access to data on disks? If there's some brilliant program for Windows, I can run that set also on Windows if it's necessary.

 

[13thmonkey]

You need to understand which raid controller it was using, and then recreate that, perhaps buying another one, swapping disks, removing data, reinserting old disks. This is one of the issues with RAID, it can be controller specific. You may get lucky and it is software raid, in which case you need to understand the software.

 

[Snipergod87]

Most NAS's are software raid using Linux's MD RAID, but I do not know about that model Netgear but most that I have seen use Linux's MD RAID, it also depends what file system you were using, either ext4 or BTRFS, if BTRFS you will need a linux distro that supports BTRFS as well

 

[Marsjanin]

Mostly probably there was RAID-5, because it's default in the device when installing 3 or more disks. Manual saids also there is X-RAID mode default, in opposition to Flex-Raid (I guess both of them are kind of data management inside RAID-5). So this probably is RAID-5 – X-RAID. Look at the screenshots; there are three large partitions on each disk (visible as non-raid) with LVM on them. Unfortunately RAID is visible now (as empty surface) in right size (6 TB) but cannot be accessed. I found in the manual that supported FSs are FAT32 and EXT3.

The Software Manual

 

[mdd1963]

http://www.downloads.netgear.com/files/GDC/RND2110/RAIDiator4-1_SW_en_06Dec11.pdf

"...• X-RAID. NETGEAR’s proprietary single-volume architecture that automatically chooses
which type of RAID set is best depending on the number of disks in your ReadyNAS
system. X-RAID chooses to protect your data against disk failure whenever possible. If
your ReadyNAS system contains two or more disks and a disk fails, no files are lost and
users can continue to access the ReadyNAS system as normal. When you add a disk to
your ReadyNAS system, it is formatted in the background while users continue to access
your unit.
• Flex-RAID. Offers more flexibility because it lets you choose how many volumes to
create, which type they should be, and whether to use a disk as a hot spare. (If another
disk fails, the hot spare automatically replaces it.) With Flex-RAID, adding a disk to a
volume takes more work than with X-RAID because you need to take your system offline
as you manually back up your data, add the disk, and restore your data.
-----------------

Proprietary technologies, this collection of RAID discs is not going to be readable in any ordinary Linux build....

YOu'd likely need another like Netgear product...

 

[Marsjanin]

Bad news, but news. 🙁 Thanks.

 

[popatim]

The NV+ uses Linux Logical Volume Manager aka LVM2. So you will need to use LVM commands to assemble the volume.
It looks like you have 3 LVM partitions setup on the Raid from your screenshot.

Whats wrong with your ReadyNas, if its just dead you may just need a new powersupply. (A pc powersupply will not work due to a different pinout)

Worst case: just buy another ReadyNas and install the drives but be aware that the version 1 & 2 can only read their drives and on the v1 the drives must be put back in the same slots they came out of.




Good luck

 

[Marsjanin]

Well, motherboard is broken, I just need to recover data. It's not the power supply issue.

Here's what I get from LVM:

# lvm lvdisplay
--- Logical volume ---
LV Path /dev/c/c
LV Name c
VG Name c
LV UUID LG6ok6-EhcF-B4T2-5Zni-bRLI-QxvK-mb0Hnr
LV Write Access read/write
LV Creation host, time ,
LV Status available
# open 0
LV Size 5.45 TiB
Current LE 178632
Segments 9
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 254:0