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.
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