In my array are drives with a thumbs down, details inside

[jang430]

When I hover on top, it shows:

 

Reallocated sector count: 48
UDMA CRC error count: 4

 

Are these reasons for concern?  I've used Seagate Tools to verify drive integrity, they did pass the long generic test, without LBA reallocation--can't recall the exact term.  Out of 6, all but 1 had LBA reallocation.  But I wonder why when connected to Unraid, I have 3 thumbs down, each with their own reallocated sector count...  

 

I always thought it was just the HDD getting too hot, hence a thumbs down.  Does this mean the drives are about to fail?  I just recently bought them off ebay, a good deal.  I'd hate to see them go without using it for a few years.

 

[JorgeB]

UDMA CRC errors are a connection problem, and it's fine as long as it doesn't keep increasing, reallocated sector count is not so good, but as long as it's a low number and it remains stable it should be fine, you can acknowledge the current values.

[jang430]

When you say connection problem, do you mean cable problem?  In another post, I mentioned that I encountered problem with drive, and you pointed out that cable problem.  I did change the cable, and seems to work fine, except the thumbs down happened.  Could this mean my replacement cable (2nd one) might have problems as well?  I bought another new one, if needed to replace another.

 

If I do acknowledge it, and no more thumbs down happens, it means it didn't increase?  If a new thumbs down happened, it means there are new changes?

[JorgeB]

48 minutes ago, jang430 said:

do you mean cable problem?

Yes, also note that the attribute doesn't reset, but as long as it doesn't keep increasing problem is solved.

[JorgeB]

49 minutes ago, jang430 said:

If I do acknowledge it, and no more thumbs down happens, it means it didn't increase?  If a new thumbs down happened, it means there are new changes?

Yep.

[jang430]

Yes, also note that the attribute doesn't reset, but as long as it doesn't keep increasing problem is solved.

What are considered attributes?


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[JorgeB]

I was referring to SMART attributes, you can google it if you don't know what that means.

[jang430]

Replaced my cable.  Acknowledged the thumbs . It was good for about a week.  Now, I have failed drive.  tower-diagnostics-20210508-2039.zip

 

I recall 1 of my drives have reallocated sectors.  Not sure if the failed drive is the one.  There is also error in my parity.  Don't know why.

 

Please take a look.  Thanks!

 

[itimpi]

Reallocated sectors are not in themselves a bad thing as long as the number is not continually increasing (which probably means the disk could die at any time).  Having said that anything other than a small number would make me uncomfortable with continuing to use a drive.

 

your parity drive has a LOT of reallocated sectors.

Disks 1 and 5 have smaller numbers of reallocated sectors and should be kept an eye on to see if the number is stable or increasing.

which drive is showing as disabled?

[jang430]

 

Disk 3 is the one that is disabled currently.  And here I thought there is only 1 drive that has reallocated sectors.  Turns out more than 1.  By myself, where do I check and keep tract of reallocated sectors?  Does it need to be through exported diagnostics?  Or What term do I search for in Smart disk info?  

 

I was informed by JorgeB in my earlier posts that my cable may be the culprit.  I did replace it with one that was lying there.  Could it still be the cable problem? I have bought another as spare.  Could it still be a cable problem that's why Disk 3 was disabled, and Parity produced errors?

 

Please advise what to do next.  

[John_M]

You still have SATA link problems affecting Parity and Disk 3.

 

Reallocated sectors are recorded by SMART attribute number 5. You can see the SMART attributes if you click on the disk's name on either the Main page or the Dashboard page of the GUI. Unraid monitors attribute 5 and issues a warning if the number increases.

[jang430]

So the current cable could be the culprit still? 

 

I will try replacing it with the newly bought 1.

 

[itimpi]

Note that although cables can cause CRC errors (and eventual read errors) they cannot cause Reallocated Sectors to happen as that happens completely internally to the drive.

[jang430]

Noted itimpi.  But sata link problems mentioned by John_M is cable related, correct?  I assume he is pertaining to crc error?

[jang430]

I just replaced my cable.  My HDD still shows up as disabled. It's no longer in unassigned drives though, unlike before I replaced the cable. What does this mean for my drive?  I'm attaching my diagnostics.

tower-diagnostics-20210509-1654.zip

[JorgeB]

Once a disk is disable it needs to be rebuild, if you replaced the cable and since the emulated disk is mounting you can rebuild on top.

 

P.S. there are now lots of ATA errors on the cache disk, replace those cables to see if they stop.

[jang430]

Isn't it supposed to work immediately when I replace my cable?  Since connection was restored, and no re-assignment of other drives?  Since I didn't replace drives, how do I change status of disabled to enabled, and allow it to rebuild?

 

Noted on the cache disk.  Indeed, my docker containers stopped working.  I was wondering why.  While replacing the cable, I pulled on the SATA cable of my cache drive.  Went back to reseat the SATA power, it works normally now.  Thanks!

[itimpi]

43 minutes ago, jang430 said:

Isn't it supposed to work immediately when I replace my cable?  Since connection was restored, and no re-assignment of other drives?  Since I didn't replace drives, how do I change status of disabled to enabled, and allow it to rebuild?

 

Noted on the cache disk.  Indeed, my docker containers stopped working.  I was wondering why.  While replacing the cable, I pulled on the SATA cable of my cache drive.  Went back to reseat the SATA power, it works normally now.  Thanks!

 

Rebuilding a disk to itself is covered here in the online documentation accessible via the Manual link at the bottom of the UnRaid GUI.

[jang430]

Thank you!

[jang430]

While rebuilding, I already noticed 6k errors in my Parity drive, it's only been 3 hours.  Don't know if it's still worth it to continue?  What should be my next step?

tower-diagnostics-20210510-1321.zip

[JorgeB]

Parity drive is failing, you can continue the rebuild since there's no better option but there will be some data loss.

[jang430]

So far, data isn't that critical.  After rebuild, do you think I should retire the Parity already?  I can see some crc errors.  But I'm already using new cables that look pretty decent.  Is this still cable issue?

[itimpi]

6 hours ago, jang430 said:

So far, data isn't that critical.  After rebuild, do you think I should retire the Parity already?  I can see some crc errors.  But I'm already using new cables that look pretty decent.  Is this still cable issue?

It is not the CRC errors that are the main concern but the very large number of reallocated sectors on the parity drive.   Personally I would retire that drive ASAP.

 

[JorgeB]

6 hours ago, jang430 said:

do you think I should retire the Parity already? 

I would think mentioning the disk is failing makes it clear that it should be replaced, but yeah, it has a lot of pending sectors and it's generating media errors.

[jang430]

Thanks Itimpi, JorgeB!