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In the Phase II implementation, an MSCP write command is issued to each shadow set member 's controller. Even when all members are connected to the same HSC, multiple write commands are issued. As with the Phase I implementation, the write data is transferred to each shadow set member individually. The overhead of an additional MSCP command represents approximately 200 bytes on the storage interconnect (100 each for the command and response). The performance of all VAXcluster interconnects is such that this overhead is typically insignificant (the CI bus, for example, has a peak bandwidth of 8.75 megabytes per second per path).