IBM E16RMLL-I - Tivoli Storage Manager, Руководство по внедрению

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Chapter 12. Scheduling
373
12.1 The wheel of life
Figure 12-1 on page 374 shows the recommended series of operations that
should occur in a Tivoli Storage Manager environment and the sequence in
which those operations should occur. The actual start time and duration of the
various operations depend on your scheduling requirements. The sequence of
events, however, should not deviate too much from that shown here.
The circle represents a 24-hour clock, indicating the hours of the day. The daily
schedule has a period where clients perform their backups. Once the clients are
finished, the server performs housekeeping. The server makes copies of the disk
storage pools for off-siting. The server backs up its database, deletes volume
history, saves the device configuration, and creates a list of tapes for vault
processing. The server then migrates the data from disk storage pools to on-site
tape pools, and reclaims blank space from tape pools. Finally, the expiration
process runs before a new round of client backups begins for that night. We
describe these actual operations in more detail in the following sections.
The Tivoli Storage Manager server clock determines all schedule start times,
regardless of the time zones of the clients.
Many factors influence the actual start time and duration of the various
operations, including the client backup window, storage pool sizes, amount of
data, and so on. Nevertheless, you need to carefully consider the timing and
sequencing; if not, jobs can overlap and not complete properly, or jobs can tie up
server resources unnecessarily.
In the following sections we explain how such things can be accomplished.