This counter tracks the cumulative number of SCSI blocks (fixed-size storage units, typically 512 bytes each) that have been read on this LUN within this flow. An admin can use this, combined with ciscoScsiFlowRdIos, to calculate the average read size in blocks per operation for this specific path, useful for understanding whether an application is doing small random reads or large sequential ones. A flow showing a high block count relative to a modest I/O count suggests large sequential reads, typical of backup or streaming workloads, versus many small reads typical of database transaction traffic.