On 05/09/2018 05:37 PM, Rick Stevens wrote:
On 05/09/2018 03:23 PM, Samuel Sieb wrote:
On 05/09/2018 10:58 AM, JD wrote:
276 be/3 root 0.00 B/s 0.00 B/s 0.00 % 99.85 % [jbd2/sda3-8]
What command produces this output?
It comes from iotop.
From just that line, it looks like
there is no data transferred at all. I've never understood what 100% of
I/O bandwidth means. How is the maximum calculated? Or does it mean
that out of all the data transferred, 100% came from this process?
That's not what it means. The first percentage is how much of that
task's execution time it spent being swapped in and out (0.00%). The
second is how much of its execution time it spent waiting on I/O to
complete (99.85% in this case).
Here it indicates someone is flogging an ext4 filesystem fairly hard (an
indexer walking a directory tree, something logging, etc.). That also
indicates he has 7 partitions using ext4 filesystems, but doesn't say
which one is getting flogged. That's why I suggested an "iostat -p ALL
2" to identify the active device, followed by an "lsof" to see what
processes have that device open to hunt the culprit down.
OK - Thanx!. Will try that next time it gets going again.
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