Why did a 1TB HDD cope with the load, but a 2TB HDD with the same files and load did not. busy 100%?

Question

Hard disks

Hello. Here's the strange thing. Stood on the server 1TB The disk was almost completely full, just replaced its 2TB disk, moved all the files from 1TB to 2TB and as a result, the disk was stably 100% loaded in atop. Disk Toshiba HDWD120, 1TB Was also Toshiba.

Answer 1

Is it possible to index files?

Answer 2

Check that the same mount options
What thread notime and dirnotime give a lot of performance
Well and iotop see who loads and what disk