On Mon, 13 Jul 2009 16:03:00 +0100, Bryn M. Reeves wrote > On Mon, 2009-07-13 at 15:40 +0100, Bushby, Bruce (London)(c) wrote: > > > > Greetings! > > > > I'm hoping a member could assist me in clearing up some understanding > > I appear to be missing when it comes to GNBD. > > > > Today I clustered two vmware machines (active/passive shared nothing) > > and then configure GNBD....thats when I noticed it > > wants to "export" a device from one node and "import" the device on > > the other node...which I did and it all works....but that is > > not what I was after. > > > > Can GNBD be configured to keep two disks on different systems in sync > > using both synchronous and asynchronous write options? > > No. GNBD is just a cluster-aware network block device (i.e. it > implements fencing so that we can cut off a failing node from the shared > storage). > > It's only useful if you want shared storage for e.g. GFS but don't have > access to hardware shared storage resources (or only have shared storage > hardware on a subset of nodes and want to spread that out to more nodes > using IP). >
and a question from me here (asked a week ago but with no answer, so will try to be more clear now). 'only have shared storage hardware on a subset of nodes ...' - OK so if we have 3 nodes and 2 of them have access to the storage and are exporting it via GNBD - how the 3-rd node may access the data from both of them and not interupting the services in case of failure of either of the first two? > Regards, > Bryn. > > -- > Linux-cluster mailing list > Linux-cluster@redhat.com > https://www.redhat.com/mailman/listinfo/linux-cluster -- Linux-cluster mailing list Linux-cluster@redhat.com https://www.redhat.com/mailman/listinfo/linux-cluster
