I've seen this asked before and even googled but I only see people asking and no answers: What is the status of cluster aware RAID/LVM in Linux? I would like to build a highly reliable SAN by having 3 storage nodes exporting their disk as a block device using AoE and then have the 3 compute nodes each RAID 5 the 3 block devices exported by the storage nodes so that we end up with one block device, the same block device, seen by all 3 compute nodes. I would like to initialize this as a physical volume and then create different logical volumes within it with each compute node mounting a different set of logical volumes. But my understanding is that this will not currently work because LVM is not cluster aware. It seems that Linux software RAID is not cluster aware either. Perhaps I could use EVMS (which does seem to be cluster aware) on each of the compute nodes to manage the disk on the storage nodes and then export a specific volume from each storage node to just one compute node which would then do RAID 5. This way we have a cluster aware volume manager exporting volumes to be RAID'd which would only be mounted by one host each. Does this sound reasonable? I would like to avoid the use of GFS anywhere in this particular system but I might have occasion to use GFS on a different project in the future. It's been a few years since I have seriously looked into GFS but it seems to have come a long way towards being usable in a production environment. I remember it used to have its own volume management. Are most people doing GFS volume management with EVMS also? Thanks! -- Tracy R Reed http://copilotconsulting.com 1-877-MY-COPILOT -- Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
