On a legacy project I've got 4 physical machines (servers, PM's) where each server has access to the SAN and fixed-space by it's own two devices (via device-mapper multipath). The local disks of the servers are rather small but fast and capable of storing virtual machines.
Do you have suggestions of how to utilize the storage space the physical machines (hosts) can access for the virtual machines (guests)? (The SAN itself does not offer I-SCSI or NFS access)
Ideally I would implement some kind of shared storage between some of the VM's that can be used in both a webserver and a database scenario. The architecture or server setup should allow maintenance or failure of a physical machine.
I'm interested in basic tips, recommendations, do's and dont's (OCFS2, DRBD, ...).
I'm aware my description is far from detailed. Feel free to ask.