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Forum Discussion
RN102 Volume Data RAID level unknown - Disk full - after changing disk order
Hello,
I'm running on 6.8.1
I've had some Disk 2 test failed recently and I wanted to check the SMART data as well as running WD data lifeguard diagnostic to eventually do a RMA (disks are almost 3 years old and guarantie last until in 1/2 months).
what I did :
- Shutdown Readynas
- Removed disk 2
- Boot Readynas again with Disk 1 only (I know about hotswap but I felt it was more secure)
- Make the diagnostic over a USB adaptor
It all went well, no realocated sectors. I decided to check also the other disk (Disk 1)
- Put back Disk 2 in slot 2
- Let the NAS resync
- Remove Disk 1 from slot 2
It appeared that disk 1 did have some realocated sectors even though the full test was passed.
At this point, the NAS wasn't showing my network directories. Admin page>Volume was showing me an empty volume (on the empty slot) with only Disk 2 in slot 2 (it looked like this). I decided to put the Disk 2 in slot 1, and boot up the NAS, thinking that I would eventually send the disk 1 with a reallocated sector for guarantie replacement.
- With Disk 2 in slot 1 (slot 2 empty), the Nas still didn't like it much (same as above, not showing directories etc).
- I finally placed back disk 1 to slot 1 and disk 2 to slot 2.
- Waited for data sync
Now I still can't access my directories over the network, Raidar shows this :
- Volume data RAID level 1 inactive 1.8TB (100%) of 1.8TB used
- Volume data RAID level unknown inactive 0MB (0%) of 0MB used
- What did I do wrong ? Shouldn't I have placed Disk 2 in slot 1 ?
- Why is one of the disks full (they used to be at 1.4TB full) ?
Open to any suggestion to solve this without formating if possible.
3 Replies
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You could have used the disk test and/or scrub (volume maintenance functions), downloaded the logs, and looked in disk_info.log for the SMART stats. Generally it's a good idea to set up a maintenance schedule that periodically balances, defrags, tests, and scrubs. I run each every 3 months.
Though I don't see what triggered your problem. At this point the best option is to use paid support. If you have a backup, you could also do a factory reset, rebuild the NAS, and restore the data from backup.
Either way, I suggest replacing disk 1 - 1 pending sector normally isn't a big deal, but it looks like the disk might be sicker than you think.
Hi StephenB,
Thanks for your reply. I had all these balance/defrag/test running regularly, that's actually what I was refering to when I talked about disk test issues. I read here and there on this forum that in such cases I needed to check with the tool provided by WD. This is actually the source of all my troubles.
I am currious about why 1 HDD got filled up, this must have happened during the sync..
All my Data is backed up so loosing everything isn't such a big deal. It's just that I prefer to understand what happens.
New questions :
- Is it a problem to let run a NAS with a RAID 1 and only 1 HDD, does the data or anything get changed during this process ?
I have the feeling that when I had the NAS booting with 1 single HDD, there was some specific changes made on it.
- Is it a problem to switch the HDD between slot 1 and 2 (I though they were pure copy) ?
Well, as I said, I don't know what exactly triggered your issue. You could wait and see if Netgear requests to see your logs. FWIW, I expect the issue occurred when you resync'd disk 2 to disk 1 when you first reinserted disk 2. If there were errors on disk 1, then you would have damaged the file system at that point.
The system should be able to boot up with disk 2 in slot 1, though Netgear generally recommends preserving the slot order. As I mention above, I think the damage was already done before you tried that.
The good news is that you are backed up, so data recovery isn't needed. Perhaps download the logs, and then proceed with the reset. You might want to put disk 2 into slot 1 first, and leave slot 2 empty. Is the WDC disk a "Red"? If not, what model are you using?
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