IBM E16RMLL-I Implementation Guide - Page 50
Total storage available, Total storage used, GB changed per backup
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2.2.4 Total storage available Calculate the total amount of usable disk storage in GB available on the client. This number is the amount of disk storage seen by the client file system and does not contain the actual amount installed and used by a RAID or mirroring implementation. 2.2.5 Total storage used Calculate the total amount of disk storage in GB currently in use or expected to be used on the client. If this number is unknown, use the Total storage available from above. 2.2.6 GB changed per backup Calculate the amount of storage, data, or files changed between backup cycles. This value indicates how long the client will be busy backing up, and how robust a network is required to complete all the backups each backup cycle. It is used to estimate disk and tape storage requirements on the Tivoli Storage Manager server. Table 2-2 presents typical percentages of data changed for various sizes and types of data. Table 2-2 Rules of thumb for selecting percentage of data changed Configuration Large, busy file server Smaller, less busy file server Percentage of data changed (%) 10 5 Workstation Database using utilities or Tivoli Storage Manager for Databases 1 10-20 Database not using utilities or Tivoli Storage Manager for 100 Databases If your data change percentage is known, then enter that number in the worksheet. Otherwise, use Table 2-2 to estimate a rate, keeping in mind that your numbers may vary. A high estimate is better than one that is too low. 20 IBM Tivoli Storage Manager Implementation Guide
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