Compute network requirements (FC)

CAUTION:

ALUA setting must be enabled. If ALUA is disabled, the expected I/O performance may not be achieved. In addition, the load on the internode network may increase beyond the expected level, causing delays in non-I/O processing within the VSP One SDS Block or resulting in processing failures.

The following table lists the compute network requirements to set up an FC connection configuration in VSP One SDS Block.

Item		Requirement	Remarks
Basic configuration		Configuration with an FC switch is recommended.	Use of a combination of FC and iSCSI or NVMe/TCP in the same storage cluster is not allowed. Reinstalling storage software (VSP One SDS Block) changes the WWN of VSP One SDS Block.
Connectivity	OS	The OS of the connected compute nodes must be one supported by VSP One SDS Block.
	FC access method	An FCHBA must be used.
	ALUA setting	Asymmetric Logical Unit Access (ALUA) of the compute node must be enabled.	The system might need to be restarted when the ALUA setting is enabled.
Bandwidth		At least 16-Gbps bandwidth is required.	The recommended bandwidth is 32 Gbps or more.
Availability		When the network is redundant, the convergence time from a failure must be two minutes or less.	Make the network redundant so that it has no single point of failure (SPOF) that could disable communication in multiple storage nodes. An SPOF could cause a single network appliance failure or other link failure to stop I/O operations for the VSP One SDS Block cluster.
Security		Configure the network to physically or logically isolate it from other networks and prevent unauthorized access.
Monitoring		Configure a network monitoring system (independent of VSP One SDS Block) that detects network failures or performance degradation and enables identification of causes.	If the monitoring system is not provided, it might be impossible to troubleshoot network failures or performance degradation.
Expandability		Determine a network topology and set the zoning function in consideration of future addition of storage nodes.
Network topology		The network topology must be designed in consideration of redundant configuration and future expansion. All compute ports are reachable from the compute node.	A configuration of two targets per storage node is recommended.
Maximum transfer length per I/O request		The transfer length per I/O request that reaches the volume from the compute node must be 8 MiB or less.	Typically, the maximum I/O size that reaches the volume can be limited by the settings of the compute node OS, driver, HBA, or hypervisor. Depending on the compute node configuration and settings, I/O requests exceeding 8 MiB might be sent to the volume without being split. In that case, VSP One SDS Block outputs an event log. Follow the instructions in the VSP One SDS Block and SDS Cloud Troubleshooting Reference to resolve the issue.