how to monitor journal utilization

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Is there a way I can monitor the utilization of the OSD journal?  I
would like to know if data is coming in fast enough to fill the
journal, and thus slow down all the subsequent writes.

Once the journal is full, that becomes the bottleneck for writes, no?
(assuming that writes to the journal are faster than the OSD -- such
as with tmpfs or an SSD.  I'm using tmpfs).

Thanks,

Travis
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