Best practice for temporarily moving cache pool data onto array?

[CorserMoon]

Thanks to help and recommendations from @JorgeB, I've learned that my cache pool (2 nvme drives set to mirror) have some uncorrectable errors (based on Scrub results). THIS older thread recommends backing the cache pool files onto the array, wiping/reformatting the drives, and moving the files back onto the cache pool. 

 

What is the best practice for moving 600GB from these onto the array? Rsync via webUI terminal? Krusader? Something else? 

 

And for the "wiping/reformatting" portion, is this the proper command?

 

blkdiscard /dev/nvmeX

 

[JorgeB]

I like rsync since it's easy to resume an aborted transfer if needed.

 

10 hours ago, CorserMoon said:

And for the "wiping/reformatting" portion, is this the proper command?

blkdiscard /dev/nvme1n1

blkdiscard /dev/nvme0n1