I just pre cleared a 4TB drive, then because of a flaky sata card that dorked the drive I had to use some windows tools to get the drive back. Unfortunately the pre clear code went away because of these tools. I shutter to have to run that again (20+ hours). is there a way to NOT pre clear the disk when installing it since it has passed pre clear already? It's just missing the code on the disk.

 

Thanks!!

Edited July 18, 20178 yr by manorfan

Not sure what you are asking. It is generally advisable to do at least one pre clear before installing a new drive, some people choose to do more then one, but it's up to you. Personally I always do one pre clear on any new drive, internal or external before adding it to a server.

IF you do not preclear the drive, unRAID will do it in the background and that new drive will not be available until that operation has been finished and the drive is formatted.  You will be able to use the array while this is going on but performance may suffer.  (In the past, the array was unavailable until this whole operation was finished which is why the original preclear script was written.  It allowed the preclear to be done off-line and when the new drive was added, the array was unavailable only the period of time required for the formatting-- approximately two or three minutes.)

Thanks. So what you're saying is if I don't pre clear the drive again before using it in the array, Unraid will do it anyway before it puts the drive online?  

11 minutes ago, manorfan said:

Thanks. So what you're saying is if I don't pre clear the drive again before using it in the array, Unraid will do it anyway before it puts the drive online?  

Yes, it has to do it to keep parity properly synced.

You can run teh pre-clear with 0 reads so it should finish faster.

32 minutes ago, Frank1940 said:

Yes, it has to do it to keep parity properly synced.

Thanks!

 

27 minutes ago, Perforator said:

You can run teh pre-clear with 0 reads so it should finish faster.

I'll try that. Thanks all.