On 25/08/15 04:45 AM, Ulrich Windl wrote: >>>> Digimer <li...@alteeve.ca> schrieb am 24.08.2015 um 18:20 in Nachricht > <55db4453.10...@alteeve.ca>: > [...] >> Using a pair of nodes with a traditional file system exported by NFS and >> made accessible by a floating (virtual) IP address gives you redundancy >> without incurring the complexity and performance overhead of cluster >> locking. Also, you won't need clvmd either. The trade-off through is >> that if/when the primary fails, the nfs daemon will appear to restart to >> the users and that may require a reconnection (not sure, I use nfs >> sparingly). > > But that's a cheap trick: You say don't provide HA-storage (CFS), but use > existing one (NFS). How do you build a HA-NFS server? You need another > cluster. Not everybody has that many nodes available.
DRBD in single-primary will do the job just fine. Recovery is simply a matter of; fence -> promote to primary -> mount -> start nfs -> take virtual IP, done. Only 2-nodes needed. This is a common setup. >> Generally speaking, I recommend always avoiding cluster FSes unless >> they're really required. I say this as a person who uses gfs2 in every >> cluster I build, but I do so carefully and in limited uses. In my case, >> gfs2 backs ISOs and XML definition files for VMs, things that change >> rarely so cluster locking overhead is all but a non-issue, and I have to >> have DLM for clustered LVM anyway, so I've already incurred the >> complexity costs so hey, why not. >> >> -- >> Digimer >> Papers and Projects: https://alteeve.ca/w/ >> What if the cure for cancer is trapped in the mind of a person without >> access to education? >> >> _______________________________________________ >> Users mailing list: Users@clusterlabs.org >> http://clusterlabs.org/mailman/listinfo/users >> >> Project Home: http://www.clusterlabs.org >> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf >> Bugs: http://bugs.clusterlabs.org > > > > > > _______________________________________________ > Users mailing list: Users@clusterlabs.org > http://clusterlabs.org/mailman/listinfo/users > > Project Home: http://www.clusterlabs.org > Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf > Bugs: http://bugs.clusterlabs.org > -- Digimer Papers and Projects: https://alteeve.ca/w/ What if the cure for cancer is trapped in the mind of a person without access to education? _______________________________________________ Users mailing list: Users@clusterlabs.org http://clusterlabs.org/mailman/listinfo/users Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://bugs.clusterlabs.org