On Tue, Feb 18, 2014 at 07:03:44PM +0530, Pratik Mehta wrote: > Hi, > I am trying to use a cluster with Pacemaker + CMAN on CentOS 6.4. The > application that runs on the cluster includes a userspace SCTP stack. > However CMAN loads dlm which loads the Linux kernel sctp module, which > interferes with the userspace SCTP. > > I do not have any GFS/locking requirements on this cluster. I use a 2 node > cluster to failover a bunch of IP addresses. > > I tried setting DLM_CONTROLD_OPTS="-r 0" and blacklisting sctp module. > Didn't help since dlm depends on sctp and cman loads dlm. > > In /etc/init.d/cman: > errmsg=$( modprobe dlm 2>&1 ) || return 1 > errmsg=$( modprobe lock_dlm 2>&1 ) || true > > As a hack: I modified the cman service to not load dlm and lock_dlm. The > cluster seems working. However I do not know what additional functionality > was broken when I disabled these. Though a hack: I am eager to know if > someone sees an issue of running a production cluster with this. That's a fine solution. You might also be able to use 'service cman start quorum'. The cman init script could probably use some sysconfig option to either disable dlm/gfs2/etc or to tell it to quit after the quorum step. > Another options is to introduce a compile time flag in the DLM kernel > module to not use SCTP. Not long ago it was possible to avoid loading sctp, but people kept adding sctp symbols and I didn't have to time to try to keep them out. It would be nice if that could be corrected again. Dave -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
