Total Storage Available; Total Storage Used; Gb Changed Per Backup - IBM E16RMLL-I - Tivoli Storage Manager Implementation Manual

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
Workstation
Database using utilities or Tivoli Storage Manager for
Databases
Database not using utilities or Tivoli Storage Manager for
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.
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IBM Tivoli Storage Manager Implementation Guide
Percentage of data
changed (%)
10
5
1
10–20
100