Veritas Storage Foundation™ and High Availability Solutions ...

Veritas Cluster Server: Configuring Oracle VM Server for SPARC for high availabilityConfiguring VCS to manage a Logical Domain using services from multiple I/O domains141About virtual disk multipathing for storage servicesYou must configure virtual disk multipathing only if the storage back-end deviceis a LUN, Shared Disk, or CVM volume.Virtual disk multipathing enables you to configure a virtual disk on a guest LogicalDomain to access its back-end storage by more than one path. This feature ensuresthat the virtual disk accessed by the guest logical domain remains accessible aslong as services from one of the I/O domain are available.For example, if you set up a virtual disk multipathing configuration to access aphysical disk from a shared storage that is connected to more than one servicedomain. So, when the guest domain accesses the virtual disk, the virtual diskdriver goes through one of the service domains to access the back-end storage. Ifthe virtual disk driver cannot connect to the service domain, the virtual diskattempts to reach the back-end storage through a different service domain.Configuring virtual disk multipathing for LUN, Shared Disk, orCVM VolumeTo enable virtual disk multipathing, you must export a virtual disk back-end pathfrom each service domain and add the virtual disks to the same multipathinggroup (mpgroup). The mpgroup is identified by a name and is configured whenyou export the virtual disk back-end.