On 2013-04-25 09:39, James Harper wrote:
I'm doing some testing and wanted to see the effect of increasing
journal speed, and the fastest way to do this seemed to be to put it
on a ramdisk where latency should drop to near zero and I can see
what other inefficiencies exist.
I created a tmpfs of sufficient size, copied journal on to that, and
started the OSD. It core dumped pretty quickly which I assume is
related to direct io not being supported. I turned off journal dio
and the osd started okay but never recovered.
How should I do this? Is there another type of ramdisk I should use
or other journal options I should specify?
(and yes I understand that losing ramdisk will lose the osd - I'm
just doing testing)
I'm currently doing the same, for evaluation purposes. I tried copying
the journal, but never got it working properly. In the end, I just
created some new OSDs with journals on tmpfs and journal dio = false.
--
Carl-Johan Schenström
Driftansvarig
Språkbanken & Svensk nationell datatjänst, Göteborgs universitet
E-post: [email protected] | Mobil: +46 709 116769
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