Serge Dubrouski wrote: >> - what you mean by "clones" - you mean identically configured nodes? >> That's not a problem, really, > > I mean the CRM feature that is called "clones". See CRM documentation.
Sure, except where can I find it? Is there any? I googled and googled and nothing except Pacemaker's CLI manual came up ( http://www.clusterlabs.org/mediawiki/images/8/8d/Crm_cli.pdf ) Sure that's interface and that's smth, but I really have problem with finding some sort of tutorial or book that would explain concepts and advanced configuration for CRM and other key pieces of Linux-HA? I ordered Karl Kopper's "Linux Enterprise Cluster" book -- but if there's anything, online or printed, that would explain *in detail* advanced configurations like those, please let me know (anybody out there). >> - 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? Cluster filesystems seem big, complex and have problems with performance: http://hoston.it/blog/2009/03/19/htaccess-revisited/ Not to mention things like metadata performance (just 1 Lustre metadata server for entire fs) and if Lustre metadata server goes on vacation, I can kiss entire cluster goodbye.. Anyway, is OCFS2 an answer safety-wise and performance-wise? Suppose I wanted to run MySQL instances on this? Sorry for all these questions but I really need info on such vital issues and google is not very helpful this time around.. Regards, mk > >> Regards, >> mk >> >> >>> On Mon, Jun 15, 2009 at 10:16 AM, Marcin Krol<[email protected]> wrote: >>>> Hello, >>>> >>>> Let the newbie ask another question: >>>> >>>> Can both nodes in active-active configuration run the same *type* of >>>> resources? I mean, suppose I configure two separate instances of Apache >>>> and relevant resource groups for them, can I run them on both nodes at >>>> the same time, have one node fail over to 2nd node and have both >>>> resource groups functioning properly on that 2nd node? >>>> >>>> Regards, >>>> mk >>>> _______________________________________________ >>>> Linux-HA mailing list >>>> [email protected] >>>> http://lists.linux-ha.org/mailman/listinfo/linux-ha >>>> See also: http://linux-ha.org/ReportingProblems >>>> >>> >>> >> _______________________________________________ >> Linux-HA mailing list >> [email protected] >> http://lists.linux-ha.org/mailman/listinfo/linux-ha >> See also: http://linux-ha.org/ReportingProblems >> > > > _______________________________________________ Linux-HA mailing list [email protected] http://lists.linux-ha.org/mailman/listinfo/linux-ha See also: http://linux-ha.org/ReportingProblems
