The following restrictions apply when you configure the system by using NVMe over Fibre Channel (NVMe-oF) or NVMe over TCP (NVMe/TCP) for the connection between hosts and the storage system. For details, see the Provisioning Guide.
Configurations that use NVMe-oF or NVMe/TCP for remote paths are not supported.
For the timeout time for the commands sent between hosts and storage systems, set a value equal to or greater than the timeout time for the commands sent between storage systems.
You cannot create a pair combining an NVMe-oF or NVMe/TCP volume (volume that is defined as a namespace on the NVM subsystem added with an NVM subsystem port) and a Fibre Channel volume or iSCSI volume (volume set with an LU path). See Data path requirements and configurations.
For details about the supported combinations of storage systems for P-VOLs and S-VOLs that are connected to a host via NVMe-oF or NVMe/TCP, see System requirements and specifications.
For details about the types of supported three data center (3DC) configurations using a volume connected to a host via NVMe-oF or NVMe/TCP, see the system requirements in the VSP One Block Universal Replicator User Guide.
The supported DKCMAIN microcode versions must be used on all storage systems in the three sites. If the DKCMAIN microcode version on any of the storage systems in the three sites is not the supported version, the following operations might fail:
- TC pair operation
- UR pair operation
- Delta resync UR pair operation
If the operation fails, see the troubleshooting section for corrective actions.
When you use a volume connected to a host via NVMe-oF or NVMe/TCP, specify the pair volume using a dummy LU. For details, see the topic on namespace pair operations with NVMe-oF or NVMe/TCP in the Command Control Interface Command Reference.