On Mon, May 8, 2017 at 1:45 PM, Spandan Kumar Sahu <spandankumarsahu@xxxxxxxxx> wrote: > Hey evryone > > My name is Spandan Kumar Sahu, a second year undergraduate student > from Indian Institute of Technology, Kharagpur (India), pursuing > Bachelor of Technology in Computer Science and Engineering. Welcome to this community, Spandan! > > It is my pleasure to have been selected under the GSoC program. This > [1] is my proposal. I have also included an example of its working. > [2] > > As a start, Kefu Chai, suggested me to document the problem under > doc/dev and attempt to put together as many documents regarding > reweight, as possible. I think it would serve a good reference for whomever interested in this topic in future. we can start by maintaining a markdown document in your ceph repo, and when it's ready for review you can send a pull request from it. > > I would really appreciate if anyone can go through the proposal, and > suggest me changes/problems. i like your idea of applying PID to ceph. but i am not sure if the PID algorithm applies to Ceph. or put in other words, is a Ceph cluster a linear system? what is it's transfer function? does it satisfy the Nyquist stability criterion? if not, how can we determine its stability? as it's always the most difficult part to tune the PID controller parameters when designing a PID based control system. instead, i think Ceph is a stochastic process. as discussed in another thread (with the title of "crush multipick anomaly") in this mailing list. > > Thanks > > Spandan Kumar Sahu > IIT Kharagpur > > [1] : https://github.com/SpandanKumarSahu/Ceph_Proposal/blob/master/GSoCProposalSMARTERREWEIGHT-BY-UTILIZATION.pdf > [2] : https://github.com/SpandanKumarSahu/Ceph_Proposal/blob/master/Readme -- Regards Kefu Chai -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
