IBM E16RMLL-I Implementation Guide - Page 66
Workload calculations
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Workload calculations An important consideration for designing the overall Tivoli Storage Manager solution is the total amount of data that the Tivoli Storage Manager server will need to support for backup or restore over a particular time frame. A normal approach to estimate the network bandwidth needed is to consider all client information backed up in the same backup window using the following procedure: 1. Calculate the amount of data a Tivoli Storage Manager server will have to accommodate during its nightly backup window and ensure that the hardware can reasonably accommodate the data. 2. Calculate the amount of data that will be restored from a disaster recovery Tivoli Storage Manager server and ensure that the hardware will meet DR recovery SLAs. We can calculate the workload for a Tivoli Storage Manager server in a theoretical environment. As an example, the environment has the following systems that we must back up: Twenty workstations Each workstation has 60 GB of file data. - Incremental forever backup with a change of approximately 10% - Six-hour backup window Four database servers Each server has 100 GB of database data. - Full backups with a change of 100% - Six-hour backup window So doing the calculation for backup workload, each night we will need to back up: (60 × 20 × .10)+ (100 × 4 ×1) = 520 GB And dividing that by the time allowed for the backup: 520GB ≈ 86.6 GB 6Hr Hr So the network interfaces, drives, Tivoli Storage Manager server, and all other infrastructures must handle this amount of data in order to meet SLAs for this environment. Note that this type of calculation does not only apply to backups-it can and should be done for disaster recovery restores and single system restores. 36 IBM Tivoli Storage Manager Implementation Guide
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