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:
- ESX(i) Server has FC HBA and also with software iSCSI enabled.
- ESX(i) Server software has iSCSI enabled,and virtual machine software iSCSI installed.
- ESX(i) Server has FC HBA and with software iSCSI enabled, along with virtual machine software iSCSI installed.
The protocol to be used depends on the storageProtocol parameter
of the Volume Shadow Copy Service and Virtual Disk Service configuration
and which protocols are available. The priority among the various
protocols is as follows:
- ESX(i) Server FC has the highest priority. If the storageProtocol parameter is set to auto, the Volume Shadow Copy Service and Virtual Disk Service first checks if ESX(i) Server FC is available. The Volume Shadow Copy Service and Virtual Disk Service tries other protocols only when the FC protocol is not available.
- Virtual machine software iSCSI has a higher priority to software iSCSI. If the storageProtocol parameter is set to auto or iSCSI and FC protocol is not available (no HBA or WWPNs not defined on storage), the Volume Shadow Copy Service and Virtual Disk Service first checks if iSCSI is enabled on the virtual machine. The Volume Shadow Copy Service and Virtual Disk Service tries ESX(i) Server software iSCSI only when the virtual machine software iSCSI is not available.