Penta Sata Hat poor raid 5 Write Performance

Have Rock Pi 4a 4gb, Pentat sata Hat, running Armbian 20.04 with GUI.

4 8TB Exos Drives, Getting 350MB on Read Performance, only 8MB on Write Performance

I had 2 different drives before, swapped all to Exos drives for performance and Read performance has gone up. Write Performance has Plummeted. What do I check to fix?

Did you just make your partitions with EXT4?

Is there some raid rebuild going on in the back?

I don’t have this hat to verify.

Yup. Used ext4. No. No rebuild happening.

And you read information on the provided link? Lazy ext4 init have significant impact on performance … try again by formatting it this way to rule it out: