Hello, I'm presently a bit puzzled about asynchronous journal patches.
While I was just reading the jbd-journal-chksum-rhel53.patch patch, I noticed it also adds a new option and feature "journal_async_commit". But then ever since lustre-1.8.0 there is also a patch included for async journals from obdfilter. This patch is presently disabled, since it could cause data corruption on fail over. I now wonder how these two patches/features are related, so jbd/ldiskfs/ext4 (journal_async_commit vs. obdfilter (obdfilter.*.sync_journal=0). When I did some tests with lctl set_param obdfilter.*.sync_journal=0, it even slightly reduced performance. So I wonder if one additionally needs to enable jbd-async journals? Thanks, Bernd -- Bernd Schubert DataDirect Networks _______________________________________________ Lustre-discuss mailing list Lustre-discuss@lists.lustre.org http://lists.lustre.org/mailman/listinfo/lustre-discuss
