WD Critical Error with healthy SMART attributes?

[Andromeda]

A few days ago I got jump scared by a critical drive error, so I immediately ran an extended SMART test. To clarify, I have scheduled weekly quick SMART and monthly extended SMART tests, and the drive have always shown up healthy. Eventually the extended SMART test's result came back with 7 reallocated sectors but are otherwise healthy. So what's going on here? I can't find any more details about this error anywhere else. I've tried to insert the drive into another bay, clean the connectors using compressed air can, and restarting dsm, none of them helped. At this point I'm more interested in learning more about the details of the error and try my luck with serverpartdeals' RMA process.

 

[EAZ1964]

The I/O error is often caused by bad connections from e.g. a connector or cable.

As this lies outside the drive, SMART will not detect this.
taking out the drives, clean the connectors, vacuum the NAS and carefully but firmly reposition the disks may help.

Western Digital Support | Western Digital

Find detailed answers to your support questions for your Western Digital, SanDisk, WD_BLACK, or WD storage product.

support-in.wd.com

 

[DSfuchs]

Hi, did you carry out this resource, for example, for the extended analysis?

Prepared for HDD/SSD issues.

Sooner or later, sometimes even sooner than that, problems involving HDDs or SSDs are bound to arise within the Synology Storage Manager. However, critical errors are not always attributable to a hardware-related cause. To help you narrow down...

www.synoforum.com

Starting with DSM 7.2, Synology systematically suppresses critical hard drive errors and analyses, or these are "hallucinated" by Synology itself, too.

Which specific version of DSM are you running, and are they perhaps even SAS hard drives?

 

[Telos]

SMART results mean very little. You can have healthy drives and a crashed pool. Or as you see, healthy drives and I/O errors. Many sources cause these disruptions. SMART can only confirm a failed/failing drive.

 

[Andromeda]

The I/O error is often caused by bad connections from e.g. a connector or cable.

As this lies outside the drive, SMART will not detect this.
taking out the drives, clean the connectors, vacuum the NAS and carefully but firmly reposition the disks may help.

Western Digital Support | Western Digital

Find detailed answers to your support questions for your Western Digital, SanDisk, WD_BLACK, or WD storage product.

support-in.wd.com

I’ve cleaned both the drive connectors and nas connectors, as well as swapping the drive bay, even manually deleting all errors from SYNODISKDB, but the critical error still remains. I will try and see if I can access the drive on my pc. It’s a SATA drive.

 

[Andromeda]

Hi, did you carry out this resource, for example, for the extended analysis?

Prepared for HDD/SSD issues.

Sooner or later, sometimes even sooner than that, problems involving HDDs or SSDs are bound to arise within the Synology Storage Manager. However, critical errors are not always attributable to a hardware-related cause. To help you narrow down...

www.synoforum.com

Starting with DSM 7.2, Synology systematically suppresses critical hard drive errors and analyses, or these are "hallucinated" by Synology itself, too.

Which specific version of DSM are you running, and are they perhaps even SAS hard drives?

I do have Scrutiny installed via container manager, which is how I found out that there are 7 reallocated sectors