The intent log size is chosen when a file system is created
and cannot be subsequently changed. The mkfs utility uses a default intent log size of 1024
blocks. The default size is sufficient for most workloads. If the system
is used as an NFS server or for intensive synchronous write workloads,
performance may be improved using a larger log size.
With larger intent log sizes, recovery time is proportionately
longer and the file system may consume more system resources (such
as memory) during normal operation.
There are several system performance benchmark suites for
which VxFS performs better with larger log sizes. As with block
sizes, the best way to pick the log size is to try representative
system loads against various sizes and pick the fastest.
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