On Thu, Jun 9, 2011 at 4:58 AM, Alessandro Iurlano <alessandro.iurl...@gmail.com> wrote: > Hello. > > I'm trying to setup an highly available OpenVZ cluster. As OpenVZ only > supports disk quota on ext3/4 local filesystems (nfs and gfs/ocfs2 > don't work), > I have setup two iscsi volumes on an highly available storage where > VMs will be stored. > I would like to use three servers, two active and one spare, for this > cluster. That's because OpenVZ expects all the VMs to be under /vz or > /var/lib/vz directory. This leads to the constraint that each server > can have only on iscsi volume attached and mounted on /vz. > Also, as the ext3 fs is not a cluster filesystem, each iscsi volume > has to be mounted on a single server at time. > > So I need to map two iscsi volumes to three servers. I have created a > pacemaker configuration with two groups, group-iscsi1 and > group-iscsi2, that take care of connecting the iscsi devices and > mounting the filesystems on /vz. A negative colocation directive > forbids the two groups from being active on the same cluster node at > the same time. > > So far things are working. The problem is with the resource that > controls OpenVZ. It is a lsb:vz primitive that needs to be a clone (I > can't make it into separate lsb-vz1 or lsb-vz2 primitives as the > cluster sees both active on every node because they refer to the same > /etc/init.d/vz script). > After creating the clone clone-vz, I defined the location constraints > as location vz-on-iscsi inf: group-iscsi1 clone-vz and did the same > for group-iscsi2. > The clone resource needs to be started after filesystems are mounted, > so I need two order constraints like order vz-after-fs1 inf: > group-iscsi1:start clone-vz:start and order vz-after-fs2 inf: > group-iscsi2:start clone-vz:start > This works perfectly when both iscsi volumes are up. But if one of > them is stopped, clone-vz is not starting. I guess this is because the > two order constraints create dependencies for clone-vz on both the > iscsi groups so that the clone is started only when group-iscsi1 AND > group-iscsi2 have started. > > Is there a way I can tell pacemaker to start clone-vz on a node if > that node has resource group-iscsi1 OR group-iscsi2?
Not yet I'm afraid. Resource sets will eventually allow this but I don't think its there yet. > The complete pacemaker configuration is here: > http://nopaste.info/8c2ba79159.html > > Thanks, > Alessandro > _______________________________________________ > Linux-HA mailing list > Linux-HA@lists.linux-ha.org > http://lists.linux-ha.org/mailman/listinfo/linux-ha > See also: http://linux-ha.org/ReportingProblems > _______________________________________________ Linux-HA mailing list Linux-HA@lists.linux-ha.org http://lists.linux-ha.org/mailman/listinfo/linux-ha See also: http://linux-ha.org/ReportingProblems
