I just had to replace my cache drive due to some problems and just grabbed a drive I had sitting around. I didn't really want to preclear it so just popped it in and formated it.  I noticed when I click on the cache drive, there's something called scrub.  Can I scrub a single drive and correct errors on it?  I just want to run a check on the drive but not sure how.

 

Any assistance it appreciated.

 

8 hours ago, DigitalDivide said:

Can I scrub a single drive and correct errors on it?

Depends on the profile used, but assuming single profile it can only detect checksum errors, not fix them.

Not sure what you mean by profile used...If it can't fix them, is there something I can run that would at least mark any bad sectors?  

Scrub is not to mark bad sectors, it's for data integrity checking.

8 minutes ago, DigitalDivide said:

Not sure what you mean by profile used...If it can't fix them, is there something I can run that would at least mark any bad sectors?  

If you run RAID-1 then if 1 drive has a checksum error then it can be restored from the mirror.

 

Scrub doesn't mark bad sectors on its own and it definitely is not a sub for pre-clear (or to be exact, it's not a sub for stress testing drives before adding to the array / cache pool). (Also, scrub only tests used space).

 

Note that if it's an SSD then you shouldn't preclear at all. You would be wasting a write cycle at best and depending on the controller, you might actually end up nuking it at worst as the preclear activity confuses the controller wear leveling algo (happened to me so be forewarned).

 

A long SMART test could theoretically mark bad sectors (not applicable to NVMe) but from my experience, they don't tend to work without actual data written.

You could use whatever tools that the manufacturer has on their website to test things out (if available) but from my experience, they are way less convenient to use than preclear.

It's a cache drive and not an ssd.  Ok welll I just run a restore on it and see what happens

If you have doubts about the device health run an extended SMART test.