Le 08/09/2010 17:00, Lars Ellenberg a écrit : > On Wed, Sep 08, 2010 at 04:53:12PM +0200, Eric Deschamps wrote: >> Le 08/09/2010 16:30, Lars Ellenberg a écrit : >> >>> >>> See how not one of them references DRBD, >>> but all directly use the lower level LVs directly? >>> >>> If you bybass DRBD, you cannot expect it to magically know >>> about, and sync, your changes. >>> >> >> The VMs are directly on LVs and LVs are the backing devices for DRBD >> nodes, as in the user guide: >> http://www.drbd.org/users-guide-emb/s-lvm-lv-as-drbd-backing-dev.html >> >> The sync works (actually, makes a snapshot) if I use drbdadm >> invalidate-remote. > > > Ok, I'll try again. > You have: > > VM [DRBD] -------- [DRBD] remote node > \ / > \ / > [logical volume] > > (DRBD does not see or know about any changes done by VM) > > You need: > [VM] > | > [DRBD] -------- [DRBD] remote node > / > [logical volume] > > (DRBD sees every change done by the VM, and thus > has a chance to mirror the changes over). > > Ok? > > If you trigger a full sync in [what you have], > of course everything that is in the LV is synced over. > Though, if it is changed during that time directly from the VM, > it will be inconsistent. > > >
OK, understood. Many thanks again Lars! Eric _______________________________________________ drbd-user mailing list [email protected] http://lists.linbit.com/mailman/listinfo/drbd-user
