On Fri, Mar 26, 2021 at 10:17 AM Ulrich Windl <ulrich.wi...@rz.uni-regensburg.de> wrote: > > >>> Andrei Borzenkov <arvidj...@gmail.com> schrieb am 26.03.2021 um 06:19 in > Nachricht <534274b3-a6de-5fac-0ae4-d02c305f1...@gmail.com>: > > On 25.03.2021 21:45, Reid Wahl wrote: > >> FWIW we have this KB article (I seem to remember Strahil is a Red Hat > >> customer): > >> - How do I configure SAP HANA Scale-Up System Replication in a Pacemaker > >> cluster when the HANA filesystems are on NFS shares?( > >> https://access.redhat.com/solutions/5156571) > >> > > > > "How do I make the cluster resources recover when one node loses access > > to the NFS server?" > > > > If node loses access to NFS server then monitor operations for resources > > that depend on NFS availability will fail or timeout and pacemaker will > > recover (likely by rebooting this node). That's how similar > > configurations have been handled for the past 20 years in other HA > > managers. I am genuinely interested, have you encountered the case where > > it was not enough? > > That's a big problem with the SAP design (basically it's just too complex). > In the past I had written a kind of resource agent that worked without that > overly complex overhead, but since those days SAP has added much more > complexity. > If the NFS server is external, pacemaker could fence your nodes when the NFS > server is down as first the monitor operation will fail (hanging on NFS), the > the recover (stop/start) will fail (also hanging on NFS).
And how exactly placing NFS resource under pacemaker control is going to change it? > Even when fencing the > node it would not help (resources cannot start) if the NFS server is still > down. And how exactly placing NFS resource under pacemaker control is going to change it? > So you may end up with all your nodes being fenced and the fail counts > disabling any automatic resource restart. > And how exactly placing NFS resource under pacemaker control is going to change it? _______________________________________________ Manage your subscription: https://lists.clusterlabs.org/mailman/listinfo/users ClusterLabs home: https://www.clusterlabs.org/