IBM E16RMLL-I Implementation Guide - Page 51
Number of files backed up, Number of backup versions to be kept, Data compression
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2.2.7 Number of files backed up Calculate the total number of files to be backed up for each client. This number is used to estimate disk and tape storage requirements on the Tivoli Storage Manager server. If the number of files is unknown, two values are possible. Enter either an estimate of the number of files in this field, or enter 10% of the Total Storage Used field, in GB. 2.2.8 Number of backup versions to be kept Determine the number of changed copies that you want to keep of a file that exists on the client when the backup task runs. How many different versions of that file do you want to be able to restore? For example, if backup runs every night and a file changes every day, and you want to be able to restore any version up to one week ago, then you would choose 7 as the number of backups to keep. Remember that the more versions you choose to keep, the more database and storage pool space you will need to configure. 2.2.9 Data compression Estimate a data compression rate. To do that, you must first decide whether to use data compression on the client. Tivoli Storage Manager allows a client to compress data before sending it to the Tivoli Storage Manager server. To decide whether to use Tivoli Storage Manager compression, take into account the speed of your network, the speed of the client CPU, and whether the Tivoli Storage Manager server storage devices are capable of compression. Table 2-3 provides some criteria for selecting data compression. Table 2-3 Rules of thumb for selecting data compression Configuration Dial-up connection Network is approaching capacity High-speed data network Slower CPUs in clients Faster CPUs in clients No hardware compression on tape devices Compression Yes Yes No No Yes Yes Chapter 2. Implementation planning 21
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