Failed drive, what to do?

[karlpox]

Hi,

 

Good day! One of my drives just failed today and I dont know what to do next. The parity drive has a faulty cable I think. No time to replace it yet.

 

Should I check parity?

 

 

 

 

sobnology-diagnostics-20180522-1824.zip

[itimpi]

No - you do not want to risk corrupting parity!    As you only have a single good parity disk at this time you want to minimise the chance of another disk erroring.

 

Most of the time a red ‘x’ does not mean that the disk has failed - merely that a write to it failed so unRAID stopped using it.    The vast majority of the time this is due to an external factor such as cabling or controller issues.   As an example the parity2 drive looks fine according to its SMART report so it may be that it could be put back into operation simply by rebuilding parity on it.

 

Regarding disk2 there is no proper SMART report for it in the diagnostics so it could just have dropped offline rather than really failed..   Rebooting the system and getting new diagnostics might help decide if this is the case.   If it has failed do you have a disk to replace it with?   Do you have backups if there turns out to be a problem with recovering the disk?

[John_M]

35 minutes ago, karlpox said:

The parity drive has a faulty cable I think. No time to replace it yet.

 

The first thing is to fix that.

[itimpi]

If the parity2 disk can be gotten back into a working state then you have protection against another drive failing.    There would also be the option once parity2 is good of using the parity1 disk (as it is 3TB) to replace the failed disk.

[karlpox]

@John_Mi already changed cables. and checked disk2. and it passed the smart test without error. How do I tell unraid to add the disk again? The parity2 seems not functioning after the cable swap. probably damaged, cant do smart test on the drive as well.

 

 

sobnology-diagnostics-20180522-2200.zip

[JorgeB]

Disk2 should be replaced now, you can deal with parity2 later.

[JorgeB]

46 minutes ago, karlpox said:

The parity2 seems not functioning after the cable swap. probably damaged, cant do smart test on the drive as well.

Forgot to mention, parity2 has SMART disable, but SMART looks fine on the previous diags, except for the UDMA CRC errors, so if you already replaced the SATA cable you can re-sync it at the same time as you replace disk2.

[karlpox]

@johnnie.blackso disk2 has really failed? Im currently running extended smart test with disk, Should I stop it? So just replace disk2 then rebuild?

 

Karl

[JorgeB]

8 minutes ago, karlpox said:

so disk2 has really failed?

Yes, the error was caused by the disk, it shows 1 pending sector and a very high raw read error rate, it failed or it's failing and IMO it should be replaced now.

[karlpox]

@johnnie.blackso my parity has not completed its check recently Last check incomplete on Mon 21 May 2018 01:09:29 AM +08 (yesterday), finding 1 error.

 

Will everything be fine after I replace the the disk?

[JorgeB]

Assuming parity is valid yes, no way to know now, and replacing the disk is the best option, keep the old disk intact, it should be possible to copy most data if needed.