Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On 10-03-23 02:50 PM, Florian Haas wrote: > On 03/23/2010 07:35 PM, Michael Schwartzkopff wrote: >> Am Dienstag, 23. März 2010 17:08:56 schrieb Digimer: >>> On 10-03-23 10:02 AM, Florian Haas wrote: >>>> On 2010-03-23 14:52, Michael Schwartzkopff wrote: >>>>> Am Freitag, 19. März 2010 14:12:30 schrieb Andreas.Ruetten at hansenet.com: >>>>>> Hi list, >>>>>> >>>>>> first of all please answer also to my email-address because I'm not >>>>>> subscribed to the ML. >>>>>> >>>>>> Here are my questions: >>>>>> >>>>>> I have to set up drbd 8.0.14 (Debian stable) in dual-primary mode. >>>>>> One node has to read and write while the other node only need read >>>>>> access. >>>>>> >>>>>> Do I need GFS or OCFS? >>>>> Not really if you can be sure that the second node ONLY reads. >>>> Are you nuts? I thought you wrote books about this! >>>> >>>>>> Or would a simple etx3 sufficient enough? >>>>> Yes. Mount option "read-only" in the second node. >>>> I repeat my above statement. >>>> >>>> I'm totally baffled right now. >>>> >>>> Andreas: you want to put a filesystem on dual-Primary DRBD, it has to be >>>> a cluster filesystem. No ifs, buts, or maybes. >>>> >>>> Question is, do you really need dual-Primary DRBD? You most probably >>>> don't. >>>> >>>> Florian >>> From a purely technical view point, Michael isn't wrong. If the second >>> node never changes a single block on the DRBD partition, it can't >>> technically hurt it. Of course, you'd need to make sure that the node's >>> DRBD doesn't try to recover from failures without first fencing the >>> other node. >>> >>> It's not wise, but it's not impossible, either. >> >> didn't have my best day today. Although it should be possbile I did not say it >> is wise to do. > > To wrap this up: don't do this. Ever. The reasons have been mentioned in > this thread. Data divergence, and violation of cache coherency. > > Florian Agreed, bad idea. -- Digimer E-Mail: linux at alteeve.com AN!Whitepapers: http://alteeve.com Node Assassin: http://nodeassassin.org