Data rebuild - what happens after array restart?

[sonofdbn]

I'm on 6.11.5, running dual parity. My disk 4 has generated a few errors, so I am trying to replace it with a new drive (same size). I assigned the new drive as Disk 4 and started the data rebuild. But there's an ominous message next to it saying "All existing data on this device will be OVERWRITTEN when array is started."

 

If I take this literally, this means that after the data rebuild, when the new disk has had all the old data rebuilt on it, all this data will be overwritten when I start the array. Surely this is not what is going to happen?

 

Also a bit confused about whether the array has actually started. Because this is the message I see in the GUI footer:

 

But I'm still able to access files on the shares on the array, presumably through Disk 4 contents being emulated. I thought that if the array was stopped, the disk shares would not be accessible?

tower-diagnostics-20230914-1144.zip

[JorgeB]

4 hours ago, sonofdbn said:

If I take this literally, this means that after the data rebuild, when the new disk has had all the old data rebuilt on it, all this data will be overwritten when I start the array. Surely this is not what is going to happen?

It means any data currently on that disk (if it's not empty) will be overwritten during the rebuild.

 

4 hours ago, sonofdbn said:

Also a bit confused about whether the array has actually started.

This usually happens with Firefox if you hit "Resend" on a popup, don't use Firefox with the GUI or never hit resend.

[sonofdbn]

Thanks, I feel reassured. I just recently started using Firefox, so didn't come across the second issue before.