Maximum Staging Queue Depth is the maximum number of work elements
on the outbound work queue since the statistics were last reset.
A nonzero value indicates that the interface is not accepting outbound
data as fast as the device driver is presenting it. The maximum number
is calculated each time the device driver write initiator has built
as many writes as possible (due either to no remaining storage block
address lists (SBALs) or no more data to be written) and is about
to exit.
It is possible the device or media is simply saturated,
in which case adding another link may spread the workload sufficiently
to relieve the situation.
This is a warning situation.
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