IBM E16RMLL-I Implementation Guide - Page 65
Network
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In installations where network connectivity is slow or expensive, placing a Tivoli Storage Manager server close to the clients usually makes sense. For example, for a business that has multiple file servers in each of a number of cities interconnected by a slow network, it may be appropriate to install a Tivoli Storage Manager server in each city. 2.6.2 Disadvantages of multiple servers Multiple servers increase costs. Two small server CPUs may be more expensive than one larger CPU of the same power. Where one automated tape library may be enough, multiple servers may require multiple automated libraries. Every Tivoli Storage Manager server requires a Tivoli Storage Manager server license. Management of a multiple-server environment is more complex, costly, and time consuming than a single environment. Installation and maintenance procedures have to be repeated on each server. Confusion about where data is stored, in the event of a restore, may result. Some of these disadvantages can be reduced by using the Enterprise Administration feature. 2.7 Network The network connection plays an integral part in providing service to the client. If the other components of the solution have been correctly sized, it will often turn out that the network is the performance bottleneck. The network typically consists of a combination of network interface cards, hubs, routers, gateways, wire, and software. Tivoli Storage Manager server software, Tivoli Storage Manager client software, the server platform, and the client platform all have at least minimal monitoring or management capabilities. Often small networks may have no more than this (that is, no additional network management hardware or software), with limited or no network administration expertise. This makes the network a weak link in the overall management of the implementation. Network design, implementation, and operation are beyond the scope of this book. However, we cover some basic recommendations. 2.7.1 Network considerations The network speed to back up clients should be enough to transport common data and backup data. Generally, the backup should be done during nonworking hours. We call this period the backup window. While it is possible to split client backups to minimize network bandwidth, it makes the backup administration more difficult. Chapter 2. Implementation planning 35