[Openstack] [Swift] Dispersion populate - run how frequently?

John Dickinson me at not.mn
Fri Jan 13 05:15:05 UTC 2017

If you're running 100% coverage with dispersion report, then running it once per day seems reasonable.

If you're running something smaller, like 1-10%, then doing it once per hour might be reasonable.

The point is, make it automatic and integrate it into your normal ops metrics. Track it over time and adjust as needed.


On 12 Jan 2017, at 18:06, Mark Kirkwood wrote:

> We are running a 2 region Swift cluster with write affinity.
> I've just managed to deceive myself with the Dispersion report :-( . The last run of the populate was Early Dec, and the corresponding report happily shows 100%. All good - seemingly.
> However probing the actual distribution of a number of objects created later in Dec I see they have 3 copies in region 1 and 0 in regions 2. Hmm... I'm guessing that if we ran the population more frequently this would have been highlighted sooner. This begs the question - how frequently is it sensible to run the populate?
> regards
> Mark
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