- Is it wise to have the Xen Hosts have IP's from the Hostports IP Range of the open-e?
Use IPTables and block all uneeded paths. Only connect to the VIP. - Is it wise to use the Xen Hosts as ping-nodes?
A better choice would be switches or routers. - Is it wise to have more then 2 mpio path (or as many as you have virtual ips) when using a iscsi Volume with Failover enabled?
MPIO should match the same amount of VIP. - Shouldn't there be a setting to tell mpio on the open-e's to only announce Virtual IP's when in Failover mode, and not ALL local NIC's it sees?
Targets are broadcast on all IPs. You may use allow/deny rules to block connections on the storage side.