Forum Discussion

Aspirant

Mar 05, 2019

ReadyNAS NV+ v2 - hdd intermittenly drops connection

My NAS has recently started to drop connection to several HDDs. "Disk removal detected [disk 2]", "Disk removal detected [disk1]". Aprox 4 hours later the drive is rediscovered and rebuilding starts.

I had some growing errors on disk 2, but then also disk 1 started to disconnect. I have bought a new HDD to replace disk 2, but it doesn't seems like the NAS is recognizing it. Can it be a faulty connector?

Right now it shows disk 1, 3 and 4 as OK. Disk 1 and 3 is 2TB, 2 and 4 is 3 TB.

RAIDiator 5.3.13.

Examplelog:

Mar 4 17:01:48 NAS-Server RAIDiator: System is up.
Mar 4 17:13:53 NAS-Server RAIDiator: Ignoring hot-add event on /dev/sdb
Mar 4 17:13:53 NAS-Server RAIDiator: Disk removal detected. [Disk 2]
Mar 4 17:13:53 NAS-Server RAIDiator: A disk was removed from the ReadyNAS. One or more RAID volumes are currently unprotected, and an additional disk failure or removal may result in data loss. Please add a replacement disk as soon as possible.
Mar 4 17:13:54 NAS-Server RAIDiator: A disk was removed from the ReadyNAS. One or more RAID volumes are currently unprotected, and an additional disk failure or removal may result in data loss. Please add a replacement disk as soon as possible.
Mar 4 17:13:59 NAS-Server RAIDiator: Disk removal detected. [Disk 1]
Mar 4 17:13:59 NAS-Server RAIDiator: A disk was removed from the ReadyNAS. One or more RAID volumes are currently unprotected, and an additional disk failure or removal may result in data loss. Please add a replacement disk as soon as possible.
Mar 4 17:14:00 NAS-Server RAIDiator: A disk was removed from the ReadyNAS. One or more RAID volumes are currently unprotected, and an additional disk failure or removal may result in data loss. Please add a replacement disk as soon as possible.
Mar 4 17:14:09 NAS-Server RAIDiator: Disk removal detected. [Disk 1]
Mar 4 17:14:09 NAS-Server RAIDiator: A disk was removed from the ReadyNAS. One or more RAID volumes are currently unprotected, and an additional disk failure or removal may result in data loss. Please add a replacement disk as soon as possible.
Mar 4 17:14:10 NAS-Server RAIDiator: A disk was removed from the ReadyNAS. One or more RAID volumes are currently unprotected, and an additional disk failure or removal may result in data loss. Please add a replacement disk as soon as possible.
Mar 4 20:39:15 NAS-Server RAIDiator: New disk detected. If multiple disks have been added, they will be processed one at a time. Please do not remove any added disk(s) during this time. [Disk 1]
Mar 4 20:39:18 NAS-Server RAIDiator: A new disk was added to the ReadyNAS. If multiple disks have been added, they will be processed one at a time. Please do not remove any added disk(s) during this time.
Mar 4 20:39:29 NAS-Server RAIDiator: Disk removal detected. [Disk 1]
Mar 4 20:39:29 NAS-Server RAIDiator: A disk was removed from the ReadyNAS. One or more RAID volumes are currently unprotected, and an additional disk failure or removal may result in data loss. Please add a replacement disk as soon as possible.
Mar 4 20:39:30 NAS-Server RAIDiator: A disk was removed from the ReadyNAS. One or more RAID volumes are currently unprotected, and an additional disk failure or removal may result in data loss. Please add a replacement disk as soon as possible.
Mar 5 01:06:06 NAS-Server RAIDiator: New disk detected. If multiple disks have been added, they will be processed one at a time. Please do not remove any added disk(s) during this time. [Disk 2]
Mar 5 01:06:57 NAS-Server RAIDiator: A new disk was added to the ReadyNAS. If multiple disks have been added, they will be processed one at a time. Please do not remove any added disk(s) during this time.
Mar 5 01:07:07 NAS-Server RAIDiator: Disk removal detected. [Disk 2]
Mar 5 01:07:07 NAS-Server RAIDiator: A disk was removed from the ReadyNAS. One or more RAID volumes are currently unprotected, and an additional disk failure or removal may result in data loss. Please add a replacement disk as soon as possible.
Mar 5 01:07:08 NAS-Server RAIDiator: A disk was removed from the ReadyNAS. One or more RAID volumes are currently unprotected, and an additional disk failure or removal may result in data loss. Please add a replacement disk as soon as possible.

13 Replies

Replies have been turned off for this discussion

Hopchen
Prodigy
Mar 05, 2019
Hi Spielhaug

This looks like either a disk issue or a board issue. I can take a look at the logs if you like.
If so, download the full log set and throw them up on a Google link or similar and PM me the link.

Also, now would be a good time to backup the data if you don't have a backup already.

Cheers :)
- Hopchen
  Prodigy
  Mar 06, 2019
  Hi Spielhaug
  
  The situation is not good. I can see you have been using two different size disks (likely 2x2TB 2x3TB?). This in itself is fine but it creates two raids on top of each other.
  
  In the below raid output we would expect to see md0 (OS raid), md1 (swap raid), md2 (data raid 1) and md3 (data raid 2). md2 is completely missing and all the other raids are degraded.
  
  Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
  md3 : active raid5 sdd4[0]
  976750784 blocks super 1.2 level 5, 64k chunk, algorithm 2 [2/1] [U_]
  
  md1 : active raid1 sda2[4]
  524276 blocks super 1.2 [4/1] [U___]
  
  md0 : active raid1 sda1[4]
  4193268 blocks super 1.2 [3/1] [U__]
  
  unused devices: <none>
  
  The data volume cannot mount as a result of the missing md2 and you only see the OS volume information (information for volume "C", the data volume, is missing). At this point, access to the data is lost. You will be able to see some shares appear as folders but the content is not there. Neither can you write to the volume.
  
  Filesystem Size Used Avail Use% Mounted on
  /dev/md0 4.0G 763M 3.1G 20% /
  tmpfs 16K 0 16K 0% /USB
  
  This situation most certainly occurred because of the disks dropping in and out of the raids causing double or even triple disk failures in the array. Your disks look fine from a healthcheck point-of-view. I can see you inserted a newer one though but that won't do much as the data raids are already in trouble. I don't see the disks in the past actually being bad. One of the disks had some errors on it, but only 2 ATA errors - you replaced that one.
  
  The 3 others appear fine yet still, we see disks dropping in and out.
  
  3!!Thu Feb 21 17:28:58 CET 2019!!root!!Disk removal detected. [Disk 1]
  3!!Thu Feb 21 17:35:36 CET 2019!!root!!Disk removal detected. [Disk 2]
  3!!Fri Feb 22 06:47:39 CET 2019!!root!!Disk removal detected. [Disk 2]
  3!!Fri Feb 22 06:47:39 CET 2019!!root!!Disk removal detected. [Disk 3]
  
  The above happens over and over and this will surely have been messing up your data raids and in turn your volume.
  I suspect that perhaps the back-plane might be bad given that you didn't perform these actions.
  
  Do you have a backup of the data? I think data recovery is possible here, granted that we have at least 3 healthy disks that seems to be have been part of the raid before it went south. However, it would be wise to let NETGEAR do that part if you really need the data back. It will cost a data recovery contract which is a couple hundred bucks or something along those lines.
  
  If you have a backup or don't need the data then a factory default would probably be the best option. However, I would be concerned myself to use the NAS as this issue here is possibly chassis related. I would advise that you test each disk with a tool from manufacturer to ensure the disks are fully OK. At that point you can start suspecting the chassis might be faulty.
  
  Cheers
  - Sandshark
    Sensei
    Mar 08, 2019
    Can you tell if the drives are dropping out when they spin up? If so, it could be a power supply issue. Main chassis issue is just as likely, though, I think.