So this is a first for me. I have upgraded my hard drives many times to bigger ones AFTER pre-clearing them. Well today it wont allow me to use my new pre-cleared drives which are replacing smaller drives.

 

Always use the same method post in the wiki : https://wiki.unraid.net/Replacing_a_Data_Drive

 

1. Stop the array

2. Unassign 2x 4TB drives

3. Shut down server

4. Replace with 2x 8TB pre-cleared Drives

5. Turn on and get to Main Window

6. Add drives to the unassigned space where the 4tb drives are

7. Error :  Cant start array drives dont match.

 

Tried a few times and nothing.

 

Put back my 2x 4TB drives and my server loads fine and unraid auto starts.

 

Where am i going wrong?

Do you have 2 parity disks?

No I have only 1 right now. I will eventually add a 2nd one. It's a 8tb.

You can only fail / rebuild as many drives at a time as you have parity disks.

25 minutes ago, CrazyBoyS said:

Always use the same method

You must not have ever tried to do more than one drive at a time or you would have already seen that you can't do it with single parity.

Well then yes that is it.

 

Damb didn't know this part. I kinda feel silly now.

 

I should have researched this more before posting.

 

Appreciate all the feed back.

In the past did you add a new drive into the and rebuild a new drive at the same time?

I'm only asking because I can't think of any other situation where it would of worked in the past. 

 

As for feeling silly? Meh, we all do things now and then that are questionable. Lol

Always did 1 drive. Thays why but I have a few 8tb drives to add to replace my smaller older drives.

 

It working now adding only 1 drive as I have only 1 parity drive for now. This will be changed to 2 in the coming week or 2.

Parity has no data.

 

Parity is common in computers and communications, and it is basically the same concept wherever it is used. Parity is just an extra bit that allows a missing bit to be calculated from all the other bits.

 

In the case of Unraid, the parity disk is just an extra disk that allows a missing disk to be calculated from all the other disks. So, all the other disks must be present to rebuild a replaced disk.

 

With dual parity, you have two extra disks, and that allows you to calculate the data for two missing disks from all the other disks.

Yup I got that. I wish I read into it more before posting.

 

I should know better.

 

Appreciate all the help everyone.