On Fri, Feb 10, 2006 at 01:03:36PM -0600, Curt Moore wrote: > Hello all. > > I've been experimenting with RH Cluster Suite and GFS and have come > upon a few questions which I hope the list will be able to help. > Kudos to all of the developers, RHCS and GFS are really cool! > > To my question, I'm trying to setup a storage network with GFS and > GNBD using a 3 layered approach as shown in Figure 5 in the following > link: > > http://www.redhat.com/magazine/008jun05/features/gfs/#fig=multipath > > and also here: > > http://www.redhat.com/docs/manuals/csgfs/browse/rh-gfs-en/s1-ov-perform.html#S2-OV-MODPRICE > > Obviously, the intent is to eliminate any SPOF for the storage network. > > For the sake of example, let's say that I have 2 GNBD servers > connected directly to the SAN, snode001 and snode002. > > If I export the the same SAN block device from these 2 GNBD servers > for load sharing purposes and snode001 fails, how do the GNBD clients > importing that block device from snode001 know that they can also find > that block device on snode002? Is this somehow handled at a lower > level by configuring a resource within the RH Cluster Suite? > > I've scoured the list archives and found the following example, using > multipath, which seems to come very close: > > http://www.redhat.com/archives/linux-cluster/2005-April/msg00065.html > > However, the documentation states that multipath GNBD cannot be used > with GFS 6.1: > http://www.redhat.com/docs/manuals/csgfs/browse/rh-gfs-en/ch-gnbd.html > > Is there another way of accomplishing this without using multipath or > am I misunderstanding the concept of how multipath is utilized in this > setup? The only way for a gnbd client to access the same data served up by two gnbd servers is to use some multipath implementation. Currently there is no mulipath implementation that supports gnbd devicse. sorry. -Ben > Any feedback would be appreciated. > > Thanks! > -Curt > > -- > > Linux-cluster@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/linux-cluster -- Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
