On Sun, Dec 5, 2010 at 3:16 PM, Zrin Žiborski <zrin+pacema...@ziborski.net> wrote: > > Hi there, > > I'm browsing through pacemaker documentation and examples for > some days now, but I just do not see if / how it would be possible > to model dependency between resources so that > > - unused resources are automatically stopped
I understand the logic behind this, but the goal is at odds with a HA cluster where we try to keep as much as possible up and running. Consider, is there really a problem with keeping unused resources active? If they're unused then they're hardly going to be consuming much CPU/RAM. > e.g. a NFS export needs a mounted file system which itself needs underlying > RAID device, > * if the export is to be started, the RAID and then the mount have to be > started first. > * if the export was stopped, then the file system should be unmounted and > the RAID > device stopped because they are not needed any more. > > - there can be a weak dependency: a resource *can use* another resource, but > it can run without it as well Just use a score > 0 but < INFINITY > e.g. a RAID 1 (mirror) would use a block device exported from the other > node, > but it can run without it (in degraded mode) as well. > * before starting the RAID, the export on the other node should (try to) > start > * after stopping the RAID, the export should be stopped as well (if running) > > Is this possible in (the current version of) pacemaker? > Can rules depend on (meta-) attributes of other resources? You'll have to explain the last one better. What kind of meta-attributes > Thank you in advance for hints. > best regards, > Zrin > > > _______________________________________________ > Pacemaker mailing list: Pacemaker@oss.clusterlabs.org > http://oss.clusterlabs.org/mailman/listinfo/pacemaker > > Project Home: http://www.clusterlabs.org > Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf > Bugs: > http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker > _______________________________________________ Pacemaker mailing list: Pacemaker@oss.clusterlabs.org http://oss.clusterlabs.org/mailman/listinfo/pacemaker Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker
