Siemens 9410 Series User Manual page 132

9410 series
132
Example: fully buffered log records replicated from short-term to long-term
memory
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In this example, the log buffer equals the log depth and all the records are replicated in
both the short-term memory and the long-term memory.
Example: Partially buffered log records replicated from short-term memory to
long-term memory
In this example, the buffer depth equals 20. The first record has already replicated to
the long-term memory, making room in the log buffer for the new records (including the
newest record, in gray).
Example: Resulting gaps in data when a partially buffered log is full
However, depending on your configuration, there may be instances where the log
buffer fills up faster than it can replicate records to long-term memory. In this case, you
may lose records and see gaps in your data.
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Logging
A. Log buffer
B. Long-term memory
C. Total available space in
the log buffer (for
example, 20 records)
A. Log buffer
B. Long-term memory
C. Total available space in
the log buffer (for
example, 20 records)
7EN05-0336-03