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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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