Direct-attached cluster configuration--257 to 512 LUNs

Connectivity overview

The following information is for a direct-attached cluster configuration of 257 to 512 LUNs. The illustration and table show the number of ports and cable connections required for storage subsystems that support 256 LUNs per port or 256 LUNs per host group per port (see Storage subsystem port support, by model).

Ports and connections	Number
gFiler HBA ports used	8 (4 each node)
Storage subsystem ports used	8 (4 each CL)
Total cable connections	10, including cluster interconnect cables

Notes to the illustration:

All connected ports on a gFiler cluster have access to all LUNs for that gFiler.
The minimum number of ports are included in the illustration.
The gFiler is limited to one host group per port and the maximum number of LUNs per host group in that port.
- For storage subsystem models that cannot support more than 256 LUNs per host group per port, you must add additional redundant port pairs on the storage subsystem to obtain the 512 LUNs. You cannot just add another host group on the existing port for the gFiler to increase the number of LUNs.
- For the XP12000, one port pair per gFiler node is required. (Any direct-attached cluster configuration requires four redundant ports.)
NetApp recommends that LUNs be distributed equally over the redundant port pairs for load balancing.

Port-to-port connectivity

The following table summarizes the port-to-port connectivity scheme for this configuration example for between 257 and 512 LUNs.

Port-to-port connectivity scheme
gFiler 1	Storage subsystem
1A	CL1-A
1B	CL1-B
2A	CL2-B
2B	CL2-A
gFiler 2	Storage subsystem
1A	CL1-C
1B	CL1-D
2A	CL2-D
2B	CL2-C