From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marcel Lauhoff Subject: An Evaluation of Object Name Hashing Date: Tue, 12 Jan 2016 14:17:27 +0100 Message-ID: <87a8obhr88.fsf@uni-mainz.de> Mime-Version: 1.0 Content-Type: text/plain Return-path: Received: from mailgate-02.zdv.uni-mainz.de ([134.93.178.246]:63967 "EHLO mailgate-02.zdv.uni-mainz.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934757AbcALN1Z (ORCPT ); Tue, 12 Jan 2016 08:27:25 -0500 Sender: ceph-devel-owner@vger.kernel.org List-ID: To: ceph-devel Hi, I wrote a Master's Thesis about Ceph and cold storage last year. One of the things I looked at was modifications to object placement. Among others, what would happen to balance (e.g objects / OSD) when all objects of a file end up on the same OSD. I also ran tests with a different hash algorithm (Linux dcache). I wrote an article on my website with the analysis, changes to the source and how I ran the tests: http://irq0.org/articles/ceph/object_name_hashing ~irq0 -- Marcel Lauhoff lauhoff@uni-mainz.de