atop, loadavg, ebpf, ps and HDD issue

Before testing read/write on a HDD, check below items first:

1. Any dev sd[x] error in dmesg or jounalctl
2. loadavg and atop/htop and D status process

Because if the HDD is completely broken, the touch/cat and any read/write cmd might be blocked by kernel which is watiing for HDD response ( which is impossible )

Related docs

• atop

  • atop on stackoverflow

• Troubleshooting High I/O Wait in Linux

  • iostat -x 2 5
  • for x in seq 1 1 10; do ps -eo state,pid,cmd | grep "^D"; echo "----"; sleep 5; done : dump D state process

• Brendan Gregg's Blog - Linux Load Averages: Solving the Mystery

• How to get process load avg without tools