Serge Dubrouski wrote: > This one is much better: > http://www.clusterlabs.org/mediawiki/images/f/fb/Configuration_Explained.pdf
Thanks! That's greatly appreciated. >>>> - resource supporting active-active configuration; do you mean like >>>> Apache instances in 2 resource groups configured to use different IP >>>> addresses so they would not conflict? >>> I mean that Apache should have a shared filesystem underneath it or >>> some kind of another mechanism that will make sure that both instances >>> have the same content. Also if you try to make an active-active >>> filesystem you have to make sure that it support concurrent access on >>> different nodes, i.e. you have to use something like OCFS2 or so. >> Hmm I was thinking rather of 2 different iSCSI targets or NDB devices, 1 >> for each resource group -- is switching them possible on failover / >> failback? > > Then it's not active/active is it? I'm sorry? Perhaps I imagine it in a wrong way, but suppose node 1 has resource group, say, apache_a on iSCSI target A, and node 2 has resource group apache_b on iSCSI target B. Now, both are running their res. groups simultaneously (hence I think of them as active/active), and on the node 1 failing, node 2 mounts iSCSI target B and starts rg apache_b. And vice versa. Is that not active/active? More importantly, is such configuration achievable using Heartbeat/Pacemaker and CRM (cause that's the holy grail I'm trying to build)? > OCFS2 can be used for shared filesystem and as far as I know Oracle > recommends it for using even in Oracle RAC, MySQL is a different thing > though. I don't know how to build an active/active MySQL cluster and > I'm pretty sure that it requires more that a shared FS, the database > itself should support concurrent access from different nodes to its > data. Thanks! Regards, mk _______________________________________________ Linux-HA mailing list [email protected] http://lists.linux-ha.org/mailman/listinfo/linux-ha See also: http://linux-ha.org/ReportingProblems
