Re: tunable question

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Hi,

How big is your cluster and what is your use case?

For us, we'll likely never enable the recent tunables that need to
remap *all* PGs -- it would simply be too disruptive for marginal
benefit.

Cheers, Dan


On Thu, Sep 28, 2017 at 9:21 AM, mj <lists@xxxxxxxxxxxxx> wrote:
> Hi,
>
> We have completed the upgrade to jewel, and we set tunables to hammer.
> Cluster again HEALTH_OK. :-)
>
> But now, we would like to proceed in the direction of luminous and bluestore
> OSDs, and we would like to ask for some feedback first.
>
> From the jewel ceph docs on tubables: "Changing tunable to "optimal" on an
> existing cluster will result in a very large amount of data movement as
> almost every PG mapping is likely to change."
>
> Given the above, and the fact that we would like to proceed to
> luminous/bluestore in the not too far away future: What is cleverer:
>
> 1 - keep the cluster at tunable hammer now, upgrade to luminous in a little
> while, change OSDs to bluestore, and then set tunables to optimal
>
> or
>
> 2 - set tunable to optimal now, take the impact of "almost all PG
> remapping", and when that is finished, upgrade to luminous, bluestore etc.
>
> Which route is the preferred one?
>
> Or is there a third (or fourth?) option..? :-)
>
> MJ
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