Hello,

 

I am setting up an additional Unraid server in my environment. I am planning to use an Iron Wolf Pro 12 TB drive as a parity drive. I have not built any array but once I had the drives added and powered up the machine, I saw a warning about the reallocated sector count being 24.
This drive was previously used in a Proxmox server if that makes any difference.

Here is the warning that I saw:

 

 

I have included a copy of the smartdrive report.

Should I replace the drive?

 

Thanks.

Rick

 

 

ST12000NE0007-2GT116_ZCH0HMHX-20241209-1343.txt

Run an extended SMART test, if it passes and that number remains stable for the near future, I wouldn't worry for now.

Thanks for the reply.  I am running that test now - looks like it will take a while to run.

I will post the results when it is complete. As long as it passes this test and the number stays the same - I should be ok for this drive to be used as the one parity drive - is that correct?

 

Yes, should be OK.

Keep good backups. For me, any number >0 gets a drive tossed. Murphy's law says that number's gonna increase right when you need that drive to re-build another one.

Good to know. I was wondering about this drive since I am going to be using it as the only parity drive in a new array.

The extended test completed without error:

 

 

I ran another smart drive report and I see some differences with temp and other things but the one that stood out to me is Seek Error Rate -

this increased from 72 (raw value: 14314145) to 73 (raw value: 21390618).

 

 

 

2 minutes ago, Ablatem said:

I was wondering about this drive since I am going to be using it as the only parity drive in a new array

 

I wouldn't trust it with anything but backups

14 minutes ago, Ablatem said:

this increased from 72 (raw value: 14314145) to 73 (raw value: 21390618).

 

Look here:

 

       https://en.wikipedia.org/wiki/Self-Monitoring,_Analysis_and_Reporting_Technology

 

This is a vendor specific error and can not be normally interpreted as being significant.

 

The errors that are generally considered to be significant are colored  in salmon in the Wikipedia article.  

 

What you do with this disk is dependent of your level of comfort about things are are not 100% clear.  Will this disk fail?  Certainly--  All hard disks fail!  Will it be two days from now or two decades?  Big server providers-- like Backblaze ---have spend hundreds of thousands of dollars trying to figure what is a good indicator of a potential disk failure.  They apparently have not succeeded to date. 

 

Having said this, I have a cold spare 12TB disk precleared (As a test to reduce the possibility of infant mortality)  and ready to go if any of my disks act up.  In the event of a disk being 'red-X'ed' or any other sign of trouble, I do a swap and figure out what the issue was later. 

Thanks for your replies - they were all informative. I decided to go with Michael_P because I am very familiar with Murphy's law.

I am going to take one of the 'clean' 10 TB drives and make that my parity drive. It doesn't have any issues and I can start off 'clean'.

 

14 hours ago, Ablatem said:

I am going to take one of the 'clean' 10 TB drives and make that my parity drive. It doesn't have any issues and I can start off 'clean'.

 

Keep in mind you need every drive in the array to rebuild a failed drive, so dodgy drives in the array aren't a good idea, either

Right - I am getting rid of the problem 12 TB drive so it is out of the picture completely.