Please don't reply to lustre-devel. Instead, comment in Bugzilla by using the 
following link:
https://bugzilla.lustre.org/show_bug.cgi?id=10744



(In reply to comment #30)
> The precise settings for DDN 8500 arrays were published recently on the
> lustre-devel mailing list, (with graphs).   Also our wiki was updated at the
> same time:
> 
Please don't reply to lustre-devel. Instead, comment in Bugzilla by using the 
following link:
> https://mail.clusterfs.com/wikis/lustre/LustreDdnTuning

As far as I can tell, those setting recommendations were made on the DDN 8500s
used at ORNL for these surveys. I fail to see a magic bullet in that wiki page
that would solve the performance issues we saw in this bug.

As I recall, we were told it was the reservation based allocator that would
solve the performance problems here. We've not seen that yet, or proved the
performance improvement claims either, so I would want to leave this bug open as
well until we can verify any "fix".

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