On Mon, 2005-09-05 at 22:52 +0200, Andreas Brosche wrote: > Long story cut short, we want > - GFS on a shared SCSI disk (Performance is not important) Using GFS on shared SCSI will work in *some* cases: + Shared SCSI RAID arrays with multiple buses work well. Mid to high end here, not JBODs with host-RAID controllers. The biggest discernable difference between one of these and a FC SAN array is the fact that it has SCSI ports instead of fiber-channel ports. ? Host-RAID *might* work, but only if the JBODs behind it has multiple buses, and the host controllers are all in "clustered" and/or "cache disabled" mode. - Multi-initator SCSI buses do not work with GFS in any meaningful way, regardless of what the host controller is. Ex: Two machines with different SCSI IDs on their initiator connected to the same physical SCSI bus. > - dlm without network access (theoretically possible... > but how dependant is GFS on the cluster services?) The DLM runs over IP, as does the cluster manager. Additionally, please remember that GFS requires fencing, and that most fence-devices are IP-enabled. It may be possible to work around the need for actual ethernet by using something like PPP over high speed serial, but I don't see how that's better than a crossover ethernet cable. Also, I don't know if it will work ;) Many users choose to separate cluster communication from other forms by using a fully self-contained private network. There is currently no way for GFS to use only a quorum disk for all the lock information, and even if it could, performance would be abysmal. -- Lon -- Linux-cluster@xxxxxxxxxx http://www.redhat.com/mailman/listinfo/linux-cluster
