There are many discussions and websites that explain the process of setting up a Linux software RAID with
mdadm with the chunk size of a new RAID as 128kBs or 512Kbs. Serverfault is no exception.
I am now building a new media NAS and I see no good reason why I don't use a chunk size of 4kB though. Each of the four physical disks in the 'RAID-5-to-be' have 4KB sectors. Surely a 4kB chuck size makes the most sense mapping a 1:1 relationship from RAID volume down to disk sectors? Then atop that create the file system (which will be EXT4) with a 4kB block size?
How does a 128kB (for example) chunk size become more beneficial when disks only have 4kB sectors?