Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
> On Mon, Dec 17, 2007 at 10:55:02AM +0100, Martin Gombac wrote: >> On 2007.12.13, at 18:24, Martin Gombac wrote: >> >> >On 2007.12.13, at 17:42, Florian Haas wrote: >> > >> >>On Thursday 13 December 2007 13:45:47 Martin Gombac wrote: >> >>>Hi, >> >>> >> >>>i have a simple fail-over heartbeat/drbd cluster set up. In each >> >>>server there are two network cards. One for internet access (WAN) >> >>>and one for internal communication and synchronization (LAN). If >> >>>one node looses internet connection (WAN) the other takes over all >> >>>resources as expected, but this does no thappen with local >> >>>connection (LAN) which is just crossover UTP cable. >> >>>In case if local connection (LAN) fails, cluster does not migrate >> >>>all resources to one of the nodes and just continues to work >> >>>without synchronized drbd resources (amongst other things). >> >>> >> >>>My question is this: >> >>>How can i make one node take over all resources if local crossover > > you don't want to. > > if your lan connection dies, > and your lan connection was your replication link, > then you don't have replication anymore, > and so you would go online with non-current data. > > if currently your LAN connection is a direct "crossover cable", > why would you think any clients would benefit from failing over? > > if you change to a switched LAN, and add a ping node, > why do you think any clients would benefit from that? > > how can you be sure what component failed, > local NIC, cables, remote NIC, switch, driver, ...? > > what problem are you trying to solve? > I mean not "failing over when the LAN link dies". > please zoom out a little. > > from my point of view, it makes no sense to trigger a failover > because the replication link dies. it would even be harmful. > so don't do that. > > -- > : Lars Ellenberg http://www.linbit.com : > : DRBD/HA support and consulting sales at linbit.com : > : LINBIT Information Technologies GmbH Tel +43-1-8178292-0 : > : Vivenotgasse 48, A-1120 Vienna/Europe Fax +43-1-8178292-82 : > __ > please use the "List-Reply" function of your email client. > _______________________________________________ > drbd-user mailing list > drbd-user at lists.linbit.com > http://lists.linbit.com/mailman/listinfo/drbd-user > This speaks really to the question I posted earlier. I agree that you wouldn't want to fail-over, but... When your sync connection dies, how do you handle it? How do you prevent the other node from trying to come and and creating a split brain situation? How do you get alerted that the sync is broken? How do you recover?