READYNAS-PRO-6 Replaced Failing disks Not Rebuilding

Question

&nbsp;I have the Readynas READYNAS PRO 6All 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 beatI lost access to the NAS in Windows and saw that Drive two was going to fail so I replaced Drive two.I replaced it with a similar drive type but new and formatted, never used.&nbsp; I have four Rapid replacements HDD waiting in my officeFirmware:&nbsp; &nbsp; &nbsp;RAIDiator 4.2.31&nbsp;RAID is X-RAID2&nbsp;Drive two started to recover and at 6% it became a Spare at the same time Drive ONE start to give warning about to fail, so I replaced it as well and it now is a spare also, it did not try to rebuild.&nbsp; I now have dive six saying it needs to be replaced before it fails.&nbsp; Also Drive five satred in the last minute.&nbsp;Why does the replaced drive/s not auto rebuild?Yesterday when I replaced the first drive in drive-bay two it kept rebooting.The log file is a zip file I cannot open. All zip programs present an error when trying to un-zip. I've redownloaded the file several time with the same result.The folder structure is there but cannot access files,Still accepts credentials.&nbsp; When I try to access a +folder, it gives me an error "Check spelling of Drive.&nbsp;READYNAS-PRO-6 cannot be found".&nbsp; I also get this error. &nbsp;Can anyone help or know why my drives a systematically failing and not rebuilding whn replaced.&nbsp; Can I force the drives to rebuild?I can get to the NAS but the Folders are inaccessible.&nbsp; It now is stable as of the first picture where the drive are in spare setting and not rebuilding.

StephenB · Answer

Though it isn't clear on what exactly happened, it sounds like you tried to replace multiple drives at once (replacing a second drive before the first had resynced, and then repeating that mistake with two more drives).&nbsp; RAID can't handle that, so you likely lost your volume.&nbsp; It can't rebuild at this point.
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You can confirm by looking that the volume page in the web ui.&nbsp;
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If you don't have a backup of the data, you will need data recovery of some kind.&nbsp; Netgear does offer a service for that:&nbsp;&nbsp;https://kb.netgear.com/69/ReadyNAS-Data-Recovery-Diagnostics-Scope-of-Service
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Another thing you could try is to power down the NAS, and install the original drives in their original slots.&nbsp; Then power up the NAS, and see if the volume can be mounted.&nbsp; The challenge here is that the more things you try, the more difficult data recovery becomes.
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lbucci&nbsp;wrote:
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The log file is a zip file I cannot open. All zip programs present an error when trying to un-zip. I've redownloaded the file several time with the same result.
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Something odd here, that isn't something I've seen before.&nbsp; What error are you seeing?&nbsp;&nbsp;

lbucci · Answer

&nbsp;Another thing you could try is to power down the NAS, and install the original drives in their original slots.&nbsp; Then power up the NAS, and see if the volume can be mounted.&nbsp; The challenge here is that the more things you try, the more difficult data recovery becomes.&nbsp;I was thinking this maybe an option and will try.&nbsp; I'll let you know how it goes.Just to be clear, I swapped the first disk and it went to a spare after say for a day or so that recovery was 6% and was not moving.&nbsp; On the third day the NAS advised me that drive 3 was failing and needed to be replaced, so I did, it immediately went to spare no recovery was started.&nbsp; At some point within a few hours, drive 6 started showing up as a spare?&nbsp; Drive 6 log on the web-interface showed it wanted to be replaced as it was failing as well.&nbsp;&nbsp;I work in a data centre, in my entire life I have never seen a three-drive failure, never ever. The two disk failures are rare but have had some over a year and very common is one disk failure on any raid.&nbsp; I believe there is more at play here.&nbsp; Having said that, for the last 5 days it all stable with the layout in the photos, but cannot access the data and drives sitting on spare.&nbsp;&nbsp;&nbsp;I'll let you know how replacing the drives go.&nbsp; Thank you for your assistance

Sandshark · Answer

Volume re-sync is a drive intensive process and could drive more than one drive over the cliff to failure.&nbsp; But you may be right and there is actually somehting wrong in the NAS itself that's causing the drives to appear unhealthy.

lbucci · Answer

Well!&nbsp; I see?I replaced the drives back to the original&nbsp;slots and this below I believe means "all gone"&nbsp; So much for RAID 6Whilst the drives 1 &amp; 2 showup as Dead, they are actully okay, in the sence that RAID can format and use these two drives.&nbsp;&nbsp;&nbsp;&nbsp;

StephenB · Answer

You could attempt data recovery (or engage a service).&nbsp; Netgear does offer one:&nbsp;https://kb.netgear.com/69/ReadyNAS-Data-Recovery-Diagnostics-Scope-of-Service
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As far as the drives go, I've found that even the long test in Seatools (and Lifeguard) won't find all drive problems.&nbsp; I have had drives that pass the long non-destructive test, but fail the full erase test.&nbsp; (I've also had at least one drive that passed the erase test, but failed the non-destructive test).&nbsp; While I agree that 3 failures during a sync is really unusual, having a second drive fail during a resync certainly does happen.&nbsp; One factor (as&nbsp;Sandshark&nbsp;points out) is that a sync does stress the remaining drives.&nbsp; Another is that usually disk failures aren't detected until you try to read or write the bad sectors.&nbsp; A sync needs to read all the sectors on every drive.&nbsp; &nbsp;
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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.
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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.&nbsp; 4.2.x firmware has some expansion limits that aren't present in OS-6.&nbsp; Plus OS-6 supports SMB 3, and current TLS.&nbsp; 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.&nbsp; In the case of Seagate, the VN (Ironwolf) models are all fine.&nbsp; But many of the Barracudas are not (including the&nbsp;ST4000DM004).&nbsp; In the case of Western Digital, the Red Plus and Pro lines are all ok.&nbsp; But the Red Line is all SMR - so I recommend avoiding them.

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READYNAS-PRO-6 Replaced Failing disks Not Rebuilding

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