Thanks for replying Greg.
I am trying to figure oout what parameters should I tune to mitigate the
impact of the data movement. For now, I've set
osd max backfills = 1
Are there others you think we should set?
What do you reckon?
Cheers
Goncalo
On 08/09/2016 09:26 AM, Gregory Farnum wrote:
On Thu, Aug 4, 2016 at 8:57 PM, Goncalo Borges
<goncalo.borges@xxxxxxxxxxxxx> wrote:
Dear cephers...
I am looking for some advice on migrating from legacy tunables to Jewel
tunables.
What would be the best strategy?
1) A step by step approach?
- starting with the transition from bobtail to firefly (and, in this
particular step, by starting to set setting chooseleaf_vary_r=5 and then
decrease it slowly to 1?)
- then from firefly to hammer
- then from hammer to jewel
2) or going directly to jewel tunables?
Any advise on how to minimize the data movement?
If you're switching tunables, there's going to be a ton of movement
and you need to prepare for it. But unlike with reweighting, there
isn't really a way to do it incrementally. I don't know if we have
experimental evidence but stepping through them is very unlikely to
help; I think you just want to pick the least bad time for a bunch of
migration and enable jewel tunables directly.
-Greg
--
Goncalo Borges
Research Computing
ARC Centre of Excellence for Particle Physics at the Terascale
School of Physics A28 | University of Sydney, NSW 2006
T: +61 2 93511937
_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
