Dual port access of V3 storage


Dual port access indicates that LUNs in the same RAID group (or pool) belong to different controllers, enabling both ends to access the RAID group (or pool). Dual-end access enables concurrent read/write to a RAID group (or pool), but may deteriorate read/write performance.

Other related questions:
What's the logical port of V3 series unified storage?
Logical ports, used for file services' running, are created based on physical Ethernet ports, bond ports, or VLANs. If the parent port of a logical port running file services is faulty, an IP failover will be triggered and the services will automatically fail over to another available port based on the failover policy. If the owning controller of the logical port's current parent port is different from the file system's owning controller, the system will need to transfer I/Os between controllers, decreasing system performance.

Requirements for NAS service port bonding on the OceanStor V3 storage
The network port binding mode of OceanStor V3 storage systems is bond4. After port bonding, the following restrictions apply: 1. You must configure the 802.3ad dynamic link aggregation control protocol (LACP) mode for corresponding bond ports on the switch. 2. The storage system does not support the following port binding modes: Bonding of both GE and 10GE ports Bonding of ports on different interface modules or on different nodes FCoE ports cannot be bonded.

Bonding of Fibre Channel host ports on OceanStor V3 storage systems
OceanStor V300R001 storage systems do not support the bonding of Fibre Channel host ports.

Method used to bond ports on OceanStor V3 unified storage systems
On OceanStor V300R001 storage systems, you can bond multiple iSCSI host ports. In doing so, the data transmission rate of these iSCSI host ports can be improved significantly (assuming other components do not reach their performance bottlenecks). For details, see Bonding Ethernet Ports .

Number of interfaces used by V3 unified storage's controllers for back-end clustering
Controllers of OceanStor V3 unified storage use four 10GE clusters for back-end clustering.

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