Avago Technologies 3ware SAS 9750-16i4e - Manual (Page 173)

Background Tasks
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Figure 80. Low Latency Mode with warning when Rate=1
Table 13 provides an overview of the impact of selecting different Task Rate
and Task Mode settings.
Note: The Background Task Rate and Background Task Mode settings are only
relevant when there is host I/O activity. When there is no host activity, background
tasks (rebuild/migrate, initialization, and verify) always run at the maximum.
Table 13: Selecting Appropriate Background Task Rate and Mode
Your priority
Rebuild
Task Rate Task
Mode
Comments
Fastest rebuild time 5 Adaptive Potential for higher latency on
host I/Os
Balanced host I/O
and rebuild tasks 3 Adaptive Default setting
Minimized host I/O
latency 2 Low
Latency Background tasks will complete,
but will be slow when there are
host I/Os
Minimum host I/O
latency 1 Low
Latency Background tasks may never
finish when there are continuous
host I/Os. For example, a rebuild
may never complete.