[Ocfs2-devel] OCFS2 features RFC - separate journal?

[Paul Taysom]

 The performance you might gain from a separate journaling device will
be very dependent on exactly how the journal is done.  On NSS, the
Netware journaled file system, we ran experiments with the journal
turned off (just didn't do the write) and found it had little impact on
benchmarks like NetBench.  Part of the reason for this is that the
journal writes were asynchronous to the main flow of the system.  Normal
operations would normally not ever wait for journal writes.

Paul
 
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