From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mescal.linbit (213-229-1-138.sdsl-line.inode.at [213.229.1.138]) by mail.linbit.com (LINBIT Mail Daemon) with ESMTP id 033BD1430D for ; Wed, 25 Aug 2004 13:30:18 +0200 (CEST) From: Philipp Reisner To: drbd-dev@lists.linbit.com Subject: Re: [Drbd-dev] Re: drbd Frage zu secondary vs primary; drbddisk status problem Date: Wed, 25 Aug 2004 13:30:17 +0200 References: <20040819110202.GO9601@marowsky-bree.de> <200408251142.18807.philipp.reisner@linbit.com> <20040825102852.GS3125@marowsky-bree.de> In-Reply-To: <20040825102852.GS3125@marowsky-bree.de> MIME-Version: 1.0 Content-Disposition: inline Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 8bit Message-Id: <200408251330.17324.philipp.reisner@linbit.com> List-Id: Coordination of development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Wednesday 25 August 2004 12:28, Lars Marowsky-Bree wrote: > On 2004-08-25T11:42:18, > > Philipp Reisner said: > > So, the current policy is: > > * The primary node refuses to connect to a peer with higher generation > > counts. This keeps the data intact. This is very related to the other > > after-split-brain-policy I want to make expclicit. > > Makes sense. > > > * Remeber the options so far: (for primary-after-split-brain) > > > > - The node that was primary before split brain (current behaviour) > > - The node that became primary during split brain > > - The node that modified more of it's data during the split-brain > > situation [ Do not think about implementation yet, just about > > the policy ] > > - None, wait for operator's decission. [suggested by LMB] > > - Node that is currently primary [see example above by LGE] > > Minor clarification: I think the question is not about "Who becomes > primary", as the Sync* is decoupled from that status, but which side > drbd deems to have the good data and thus the SyncMaster. > Right. It is really a shame that I have not yet fully realized that drbd-7 is the current stable release :) > Looking at it from this angle, we have two dimensions: > > - Node state after the split-brain heals. Each side can either be > primary or secondary. > > - The data state on each side. > [...] I will post a new version of the "Summary" mail... -Philipp -- : Dipl-Ing Philipp Reisner Tel +43-1-8178292-50 : : LINBIT Information Technologies GmbH Fax +43-1-8178292-82 : : Schönbrunnerstr 244, 1120 Vienna, Austria http://www.linbit.com :