Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Hi, On Tue, 2005-09-13 at 11:06 +0200, Philipp Reisner wrote: > Hi, > > In the moment when you disconnect the device pair and fs1 is primary > we have to assume that the data is modified on fs1. > It is not possible to do a gracefull switchover while fs1 and fs2 > are disconnected. > > What you do with the "gracefull switchover" seems to the algorithms > of DRBD-0.7 as split brain situation. In DRBD-0.7 there is a > auto-recover logic implemented, that says: the node that was > primary at split brain time, has the good data. Ah, that explains things! > To really understand what goes on, please read the > http://www.drbd.org/fileadmin/drbd/publications/drbd_paper_for_NLUUG_2001.pdf > paper. And... there are tools to modify the GCs __offline__ (this means > /etc/init.d/drbd stop!! ) I'll read that. > All this got fixed in drbd-8. There you would express, what you want > with these config statements: > > after-sb-0pri discard-older-primary; > after-sb-1pri consensus; > after-sb-2pri disconnect; > > [ See item 5 of http://svn.drbd.org/drbd/trunk/ROADMAP ] > > The bottom line: This is a shortcomming of drbd-0.7, that is already > fixed in drbd-8 . DRBD-8 is not yet ready.... Ok, that's good to know. For now I'll tinker a bit with manual invalidating one side. That will cost me a full resync when reconnecting, but as long as it works as I want, that's no big problem for now. I'm not expecting very frequent netwerk trouble. I'm at the designing / testing fase of the project, so knowing that it will work with 0.8 is good enough, I'll try to work around it for now. I glanced over the roadmap and saw a lot of items with percentages complete :) Do you have a date in mind for the release of 0.8? A few months from now or something like early 2006? > -Philipp Thanks for your time and effort! Regards, -- Guus Houtzager Email: guus at houtzager.net PGP fingerprint = 5E E6 96 35 F0 64 34 14 CC 03 2B 36 71 FB 4B 5D Early to rise, early to bed, makes a man healthy, wealthy and dead. --Rincewind, The Light Fantastic