Storage protocol priority
If several protocols coexist, define a priority that determines which protocol is used during the snapshot.
The following cases require
a decision on which protocol to use:
- VMware ESX(i) Server has FC HBA and also with the iSCSI software enabled.
- VMware ESX(i) Server software has iSCSI enabled, and virtual machine software iSCSI installed.
- VMware ESX(i) Server has FC HBA with software iSCSI enabled, along with virtual machine software iSCSI installed.
The protocol choice depends on the storageProtocol parameter
of the IBM® Storage Support for Microsoft VSS and VDS configuration
and which protocols are available. The priority among the
various protocols is as follows:
- VMware ESX(i) Server FC has the highest priority. If the storageProtocol parameter is set to auto, the IBM Storage Support for Microsoft VSS and VDS first checks whether VMware ESX(i) Server FC is available. The IBM Storage Support for Microsoft VSS and VDS try other protocols only when the FC protocol is not available.
- VM software iSCSI has a higher priority than software iSCSI. If the storageProtocol parameter is set to auto or iSCSI and the FC protocol is not available (no HBA or WWPNs not defined on storage), the IBM Storage Support for Microsoft VSS and VDS first checks to determine whether iSCSI is enabled on the VM. The IBM Storage Support for Microsoft VSS and VDS tries VMware ESX(i) Server software iSCSI, only when the virtual machine software iSCSI is not available.