Detected increasing uncorrectable error count

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cpu8088 wrote:

you should have some form of backup like having a slow nas and cheaper hard drives

80+ uncorrectable errors is just a start. i would worry if data is critical.

for those enterprise grade wd re drives the warranty is 5 years. perhaps you take it up with wd

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StephenB wrote:

When the count starts to rise, I replace the disk.  I feel uncomfortable when the counts reach 50, so I replace before then. I agree that you should have a backup too, and it is always wise to make sure your backup is up to date before manipulating hard drives,  Don't do scrubs (scheduled or otherwise) with the failing drive in place.

You can (should) get an RMA from western digital - but it will not be a new drive.  It will be a recertified drive, and it might not be the same model.  They shouldn't downgrade you though - you should get at least a 4 TB enterprise class drive in exchange.

But I'd replace it now, using the drive you have on hand (assuming it is new and either a NAS drive or an enterprise drive).  Either keep the RMA'd replacement for a spare in the future, or use it in some other system.

Thanks for your feedback. I've learned from earlier mistakes and toke the recommendations often made in this community for a backup procedure to hart. The NAS is backed up fully to local USB drive. Essential files are copied to remote RN312. And a backup is maintained via rSync to a USB drive connected to that RN312 also. All backups run on a daily basis (incremental) and periodically (full backup). So I should be covered regarding backups.

The disk I swapped earlier was returned to the supplier and a replacment was supplied without issues, as the 5 years guarantee were not expired yet. It looked like a new one to me, but wouldn't know what to look for if it is rectified or not. I have a feeling these drives might not be the best choice for the RN516, as they are not marked as specific for NAS use. The WD Red series could be more appropriate.

Based on your comments, I'll replace the disk now with exactly same make and model and try to get the faulty one replaced by the supplier by a larger WD Red, if they will allow that (with some extra charge).