Sometime you can see the high load average and low cpu usage.
Probably tasks waiting for I/O – that’s quite a bit of swap in use:
Try this to find out how many tasks you have (probably) waiting on I/O:
top -b -n 1 | awk '{if (NR <=7) print; else if ($8 == "D") {print; count++} } END {print "Total status D: "count}'
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