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Extra info for Building storage networks
The scalability problems facing open systems vendors today are old problems to the mainframe industry. Backup, restore, and HSM have all been working well for many years on mainframe systems, so it seems logical to consider storing the data from open systems networks on mainframe system storage facilities. The problem with this idea is getting data onto the mainframe in the first place. Mainframes and open systems platforms have considerably different storage architectures, as discussed in Chapter 14 of this book.
For instance, a mainframe storage management system that migrates files to offline storage was never designed to inform a high-ranking executive that the presentation they had planned to use at the board of directors meeting has been automatically removed from the system for the good of the system. ) Figure 1-4 illustrates this separation of control and management between open systems and mainframe storage. Figure 1-4: Separate management of open systems and mainframe storage Mainframe Costs Without a doubt the biggest problem with mainframes is their cost.
I/O Bus Comparison I/O Bus Comparison Table 2-1 offers a brief comparison of some of the bus technologies discussed. 1, which is becoming more widely implemented in 1999; and c-PCI. 1 VME 10 33 33 33 66 10 Number of adapter slots 8 8 10 3 3 8 2 24 Max width (bits) 16 32 64 32 32 64 64 64 Max rate (MB/s) 16 64 160 160 132 132 264 80 Multifunction cards no no yes yes yes yes yes yes Autoconfiguring no yes no yes yes yes no no Future I/O Buses As processors continue to increase their performance, the I/O buses that supply them with data also have to keep up the pace.