Managing Serviceguard Extension for SAP, December 2007

Planning the Storage Layout
SAP Instance Storage Considerations
Chapter 2 57
All filesystems mounted below /export are part of HA NFS
cross-mounting via automounter. The automounter uses virtual IP
addresses to access the HA NFS directories via the path that comes
without the /export prefix. This ensures that the directories are quickly
available after a switchover. The cross-mounting allows coexistence of
NFS server and NFS client processes on nodes within the cluster.