I use 2 disks in drive pool. When use one single drive, the sequence reading or writing speed is about 160-240MB/s. When I change No Duplicate to 2x Duplicate, duplication start automatically.
However, the duplicate speed will drop down from 100MB/s to 20MB/s, and the physical disk usage will increase from 60% to 100%, if click "Increase Priority" button. By the way, files being duplicated is big big files.
This is awful. Hope it will be fixed.
By the way, why read striping doesn't improve any performance when reading one big 2x-duplicated file? Reading speed can never be over 2