>>> Lars Marowsky-Bree <l...@suse.de> schrieb am 19.05.2011 um 13:15 in >>> Nachricht <20110519111526.gn26...@suse.de>: > On 2011-05-19T09:19:42, Ulrich Windl <ulrich.wi...@rz.uni-regensburg.de> > wrote: > > > Hi! > > > > I had the doubt that setting up the SBD resources is described correctly in > the "High Availability Guide" of SLES 11. My comment (to Novell I think) was: > "Shouldn't here be a resource per node? Following the procedure, the resource > just starts on an arbitrary node. If one primitive per node, you'll need a > locational contraint to avoid multiple primitived running on the same node, > right?" > > No, one external/sbd resource per device (which usually means: per > cluster) is sufficient. > > And you do not need to clone it.
>From the description: "sbd uses a shared storage device as a medium to communicate fencing requests. This allows clusters without network power switches; the downside is that access to the shared storage device becomes a Single Point of Failure." So the sbd resource distributes the fencing requests. Now what if the node where sdb runs is the minority (non-quorum)? How can the rest of the cluster tell the minority to fence (in case of a networking failure). AFAIK, as long as the storage is reachable, the sbd daemons will just be happy. Maybe it's confusing that an sbd daemon runs on every node, but the sbd resource only runs on one node. Some more documentationg words might help here. Regards, Ulrich > > > Another book uses a clone resource for SBD (which seems to make sense). > > No, it doesn't. ;-) What value does that provide? > > > For all who don't have the test at hands, here's what the guide writes > about SBD setup (page 194): > > > > -------snip-------- > > Configuring the Fencing Resource > > 1 To complete the SBD setup, it is necessary to activate SBD as a > STONITH/fencing > > mechanism in the CIB as follows: > > crm configure > > crm(live)configure# property stonith-enabled="true" > > crm(live)configure# property stonith-timeout="30s" > > crm(live)configure# primitive stonith_sbd stonith:external/sbd params > > sbd_device="/dev/SBD" > > crm(live)configure# commit > > crm(live)configure# quit > > Yes, and that's enough. The documentation is correct on this. > > > Regards, > Lars _______________________________________________ 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
