Forum Discussion

Aspirant

Jul 19, 2019

Solved

ReadyNAS RN3220 Volume is Degraded but all green lights & no errors on disks

Hello, I'll start by stating I do not know what this "*Select Location" thing is while creating this discussion, so I apoligize if I used the wrong "Location". Here is the issue: I have a Ne...

JohnCM_S
Jul 23, 2019
Hi lfrye,

I agree with StephenB. Replacing the faulty drive will be the best option.

Regards,

JohnCM_S

NETGEAR Employee Retired

Jul 19, 2019

Hi lfrye,

Welcome to the Community!

The "Degraded" status means there is no RAID redundancy, so any disk failure will result in loss of the volume.

You can send to me the logs so we can analyze it. You may upload it to Google Drive then send to me the download link via PM (private message).

Regards,

lfrye

Aspirant

Jul 19, 2019

Hi John,

Thank you for the reply.

This is kinda odd since there hasn't been any changes to the RAID 6 array and this warning first came up on 7/11/2019. I would think this warning would have been here since the array was created years ago. How does that work?

Also, RAID 6 arrays can handle 2 drive failures since it uses two parity stripes on each disk. So I shouldn't be getting this warning message since RAID is redundant array of independent disks. Kinda odd aswell.

Can I send you the logs via OneDrive link?

Thank you,

Leif

StephenB
Guru - Experienced User
Jul 19, 2019
lfrye wrote:

Also, RAID 6 arrays can handle 2 drive failures since it uses two parity stripes on each disk. So I shouldn't be getting this warning message since RAID is redundant array of independent disks.

You will get this message if one (or two ) drives have failed or dropped out of the array. You haven't lost data, but you are being warned that the RAID protection has been degraded.

The green disk status doesn't necessarily mean the disks are healthy. I suggest you should send JohnCM_S a link to your log zip file so he can take a look at what's going on.

If you don't have a backup of your files, then I suggest that you make one. RAID isn't enough to keep your data safe (not even RAID-6).
JohnCM_S
NETGEAR Employee Retired
Jul 20, 2019
Hi lfrye,

Can I send you the logs via OneDrive link?

Yes, you can send the logs via OneDrive link.

Regards
- lfrye
  Aspirant
  Jul 22, 2019
  Good morning,
  
  I just sent the logs over to John in a PM.
  
  Thank you,
  Leif
  - JohnCM_S
    NETGEAR Employee Retired
    Jul 23, 2019
    Hi lfrye,
    
    I just saw your logs and it looks like disk 2 is already marked as faulty.
    
    md127 : active raid6 sde3[0] sda3[8] sdb3[5] sdc3[6] sdd3[7] sdi3[3] sdh3[2] sdf3[1](F)
    17552488704 blocks super 1.2 level 6, 64k chunk, algorithm 2 [8/7] [U_UUUUUU]
    
    Checking the disk_info.log, there are 5 current pending sectors on your disk 2.
    
    Device: sdf
    Controller: 0
    Channel: 1
    Model: WDC WD3000FYYZ-01UL1B1
    Serial: XXXXXX
    
    ATA Error Count: 0
    Reallocated Sectors: 0
    Reallocation Events: 0
    Spin Retry Count: 0
    Current Pending Sector Count: 5
    Uncorrectable Sector Count: 0
    
    RAID 6 has 2 parity drives but if one fails, it is still degraded. The volume becomes degraded whenever one drive outside of the total number is out.
    
    Regards,