On Tue, 2020-03-17 at 07:45 +0100, Ulrich Windl wrote: > > > > Ken Gaillot <[email protected]> schrieb am 17.03.2020 um > > > > 00:58 in > > Nachricht > <1227_1584403147_5E7012CB_1227_2106_1_3a13cd73f8738e6967d6b1c399e994a > 1155495c3.c > [email protected]>: > > It has always been the case that symmetrical=true was ignored (with > > a > > warning) for serialized constraints; the only recent change was > > making > > false the default so the warning wouldn't be displayed. > > > > If you want the services to start and stop in a particular order, > > you > > don't want a serialized constraint, just a regular order > > constraint. A > > serialized constraint merely says that the actions can't be done at > > the > > same time, either one may be done first. > > > > If you have a serialized constraint saying the resources can't > > start at > > the same time, and want that to apply to stops as well, then you > > can > > create a second serialized constraint explicitly specifying stop as > > the > > action to be ordered. > > Maybe a simple, but realistic example would help to understand.
Good idea ... 1. You have two databases that hog a lot of resources on start-up. You don't care which one starts first, but you don't want them starting at the same time because it slows everything down too much. -> use an order constraint with kind="Serialize". other actions (including stop) are unaffected 2. Same, but stopping slows everything down too. -> use two order constraints with kind="Serialize", one with first/then action = start (or let them default) and the other with first/then action = stop 3. Database B must be started after database A, and B must be stopped before A can be stopped. -> use a normal "A then B" order constraint > > > > On Mon, 2020‑03‑16 at 19:41 +0530, Dileep V Nair wrote: > > > Hi, > > > > > > I have pacemaker clusters which were working fine with Serialize > > > and > > > symmetrical=true together. After an upgrade, I see that Serialize > > > does not work with symmetrical=true. How do I make sure the > > > resources > > > in Serialize stop in reverse order of start ? All the clusters > > > are > > > already in production. Please help. > > > > > > Thanks & Regards > > > > > > Dileep Nair > > > Squad Lead ‑ SAP Base > > > Togaf Certified Enterprise Architect > > > IBM Services for Managed Applications > > > +91 98450 22258 Mobile > > > [email protected] > > > > > > IBM Services > > > > > > _______________________________________________ > > > Manage your subscription: > > > https://lists.clusterlabs.org/mailman/listinfo/users > > > > > > ClusterLabs home: https://www.clusterlabs.org/ > > > > ‑‑ > > Ken Gaillot <[email protected]> > > > > _______________________________________________ > > Manage your subscription: > > https://lists.clusterlabs.org/mailman/listinfo/users > > > > ClusterLabs home: https://www.clusterlabs.org/ > > > > _______________________________________________ > Manage your subscription: > https://lists.clusterlabs.org/mailman/listinfo/users > > ClusterLabs home: https://www.clusterlabs.org/ -- Ken Gaillot <[email protected]> _______________________________________________ Manage your subscription: https://lists.clusterlabs.org/mailman/listinfo/users ClusterLabs home: https://www.clusterlabs.org/
