Hi, On Tue, 2009-09-22 at 15:28 +0200, Edgar Matzinger wrote: > Hi Marc, > > On 09/22/09 13:23:47, Marc - A. Dahlhaus wrote: > > Hello Edgar, > > > > > > CS is needed because it contains the service (cman) that configures > > the > > participation of nodes in your cluster and also enables your nodes to > > communicate about changes they want to do an the shared filesystem. > > Then GFS is not a cluster filesystem. It is just a filesystem. > It was my perception that GFS was a stand alone application. > Why? Because GFS supports up to 300 nodes (found in Oracle 9i RAC and > the Red Hat Global File System). And CS "only" 32 > (http://www.redhat.com/cluster_suite/). Thinking about it: maybe > 300 nodes mean something different. Oracle RAC does the replication > and not GFS.... > I think there is some confusion here... the limit on the number of nodes supported (currently) depends on cluster suite. Also, the number of nodes supported is a different thing from the theoretical total number of nodes. Larger configurations may well work, its just that we don't regularly test such configurations. > > > Also it contains the method to remove failing nodes from > > participating > > in your cluster. This all is mandatory for a cluster filesystem. > > > > No, it's mandatory for a cluster. GFS itself should embed the changes > to files, directories, etc. in it's protocol used between the nodes. > The cluster suite provides part of that protocol. It also provides safeguards (i.e. fencing) for operations which would otherwise risk corrupting the filesystem. > > Please go ahead and read the available documentation if you have > > further > > interests in it here: http://sourceware.org/cluster > > > > OK, will take a look, cu l8r, Edgar. Steve. -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
