I just wonder it is normal with my system.

Here is what I though that might go wrong:
I just plotted by xplot, there is a gap of nounce between disks (ex disk 1 from 0 to 9000, disk 2 from 10000 to 19000,...). And mine by Blago mining, no local wallet/node. Sometimes I saw a lag between the pool and the Blago, the pool already start new block 30s but the Blago has not read HDD, yet.
All the disks are read within 30s. If I found a deadline, it take 20-60s to confirm by the pool. The daily income around 50-100 burst/day, but I have not forged a block for 3 weeks.

Thank you so much.