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The Question is:
The DFO documentation describes the DFG logical DFG$TRANSFERSIZE as impacting
DFO's interaction with other pocesses accessing the files but does not provide
the details of the impact and the relative changes to it's value. What is the
impact of larger/sm
aller values for this logical?
The Answer is :
The larger the chunks of data transfered by DFO during defragmentation,
the longer that other access can be locked out. That said, transfering
larger chunks of data (up to certain limits) can be more efficient than
transfering the same volume through more and smaller transfers. (The
trade-offs involved are those that are typical of I/O contention, in
other words.)
The default value of 10,000 is believed an appropriate compromise value
for most uses and for most configurations.
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