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@@ -17,6 +17,8 @@ blkiomon is a block device I/O monitor. It periodically generates per-device
request size and request latency statistics from blktrace data. It provides
histograms as well as data that can be used to calculate min, max, average
and variance. For this purpose, it consumes D and C traces read from stdin.
+Note, that this doesn't work for logical volumes, as high-level drivers
+don't see the completion of the events (C).
There are options for binary output and human-readable output to files and
stdout. Output to a message queue is supported as well.