More than one disk drive can be attached to a SCSI bus. In particular, a fast wide SCSI-II bus (see Exercise 14.17) can be connected to atmost 15 disk drives. Recall that this bus has a bandwidth of 20 megabytes per second. At any time, only one packet can be transferred on the bus between some disk’s internal cache and the host. However, a disk can be moving its disk arm while some other disk is transferring a packet on the bus. Also, a disk can be transferring data between its magnetic platters and its internal cache while some other disk is transferring a packet on the bus. Considering the transfer rates that you calculated for the various workloads in Exercise 14.17, discuss how many disks can be used effectively by one fast wide SCSI-II bus.
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