Yeah I have watched that multiple times over the weekend, and has helped very much.
So with respect to my example numbers, I am guessing that each partition will land on every '41538374868278621028243970633760768' of the md5 space. 2^(128 - 13) or 2^(128)/8192 Thanks! On Tue, Aug 19, 2014 at 8:00 PM, John Dickinson <m...@not.mn> wrote: > > https://swiftstack.com/blog/2012/11/21/how-the-ring-works-in-openstack-swift/ > is soemthing that should be able to give you a pretty complete overview of > how the ring works in Swift and how data placement works. > > Let me know if you have more questions after you watch that video. > > --John > > > > > > > On Aug 19, 2014, at 5:34 PM, Brent Troge <brenttroge2...@gmail.com> wrote: > > > > > Excuse this question and for lack of basic understanding. I dropped from > school at 8th grade, so everything is basically self taught. Here goes. > > > > I am trying to figure out where each offset/partition is placed on the > ring. > > > > > > So If I have 50 drives with a weight of 100 each I come up with the > below part power > > > > part power = log2(50 * 100) = 13 > > > > Using that I then come up with the amount of partitions. > > > > partitions = 2^13 = 8192 > > > > Now here is where my ignorance comes into play. How do I use these > datapoints to determine where each offset is on the ring? > > > > I then guess that for each offset they will have a fixed range of values > that map to that partition. > > > > So for example, for offset 1, all object URL md5 hashes that have a > decimal value of 0 through 100 will go here(i just made up the range 0 > through 100, i have no idea what the range would be with respect to my > given part-power, drive, etc). > > _______________________________________________ > > Mailing list: > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > > Post to : openstack@lists.openstack.org > > Unsubscribe : > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > >
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