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Recent research has shown that for a metadata-heavy workload, a 128 MB
is journal be a bottleneck on HDD's, and that the optimal journal size
is proportional to number of unique metadata blocks that can be
modified (and written into the journal) in a 30 second window.  One
gigabyte should be sufficient for most workloads, which will be used
for file systems larger than 128 gigabytes.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>