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Forum Discussion
READYNAS-PRO-6 Replaced Failing disks Not Rebuilding
I have the Readynas READYNAS PRO 6 All of the six drive bays have 4TB ST4000 Seagates Iron wolfs or WD 4TB and all about eight years old and has never missed a beat I lost access to the NAS in W...
Well! I see?
I replaced the drives back to the original slots and this below I believe means "all gone" So much for RAID 6
Whilst the drives 1 & 2 showup as Dead, they are actully okay, in the sence that RAID can format and use these two drives.
You could attempt data recovery (or engage a service). Netgear does offer one: https://kb.netgear.com/69/ReadyNAS-Data-Recovery-Diagnostics-Scope-of-Service
As far as the drives go, I've found that even the long test in Seatools (and Lifeguard) won't find all drive problems. I have had drives that pass the long non-destructive test, but fail the full erase test. (I've also had at least one drive that passed the erase test, but failed the non-destructive test). While I agree that 3 failures during a sync is really unusual, having a second drive fail during a resync certainly does happen. One factor (as Sandshark points out) is that a sync does stress the remaining drives. Another is that usually disk failures aren't detected until you try to read or write the bad sectors. A sync needs to read all the sectors on every drive.
If the logs haven't rotated, you might be able to see what errors triggered the behavior - perhaps look in system.log and kernel.log during the time the resync was done.
Two slightly off-topic comments:
- If you do need to start over due to data loss, you should consider converting your NAS to run OS-6. 4.2.x firmware has some expansion limits that aren't present in OS-6. Plus OS-6 supports SMB 3, and current TLS. If you need more information on that, just ask.
- If you do end up replacing some disks, be careful that you don't end up with SMR drives - they aren't well-suited for NAS, and folks here have had trouble with syncs in particular. In the case of Seagate, the VN (Ironwolf) models are all fine. But many of the Barracudas are not (including the ST4000DM004). In the case of Western Digital, the Red Plus and Pro lines are all ok. But the Red Line is all SMR - so I recommend avoiding them.
All good advice StephenB, and will follow your suggestions. I will rebuild the NAS with new drives. I will update the OS and do some background on this first. actually looking forward to this project.
I built this back some 10 to 12 years ago and it's always just been there and have never had to pay much attention to it 🥳 it has been and really still is very good hardware.
P.S.I have all My important data backup on zoolz.com so wiping and restarting is not a big issue.
thank you to all on this thread for a your assistance.
So I put new disks in, Factory reset, no Volume. Reset and I now have a volume. Problem was one of the new disks failed and I could not see it on my PC.
I put in one of the WD that was newest and was working fine, it would not resync.I swapped for another WD which was fine, still no Sync.
I tried another HDD and have tried four altogether leaving them for at least an hour each with several reboots.
I have a QNAP TS-9xx6, [with 9 drives] - I tried two of the disks that would not work in the ReadyNAS and they started synchronizing and rebuilt both drive, each taking about two hours or less.I now have the WD back in there and nothing is happening.
Other than doing the factory reset, is there any other way to force a single drive to sync?
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