content_image/971033.jpg
Figure 3-11 shows a host zoning example. 

<img src='content_image/971033.jpg'>

Consider the following rules for zoning hosts with the SAN Volume Controller: 

GLYPH<SM590000> HBA to SAN Volume Controller port zones 

Place each host’s HBA in a separate zone with exactly one port from each node in each I/O group that the host accesses. 

It is not prohibited to zone host’s HBA to one port from ev ery node in the cluster, but it will reduce the maximum number of hosts that can be attached to the system. 

Number of paths:  For n  + 1 redundancy, use the following number of paths: 

GLYPH<SM590000> With two HBA ports, zone HBA ports to SAN Volume Controller ports 1:2 for a total of four paths. 

GLYPH<SM590000> With four HBA ports, zone HBA ports to SAN Volume Controller ports 1:1 for a total of four paths. 

Optional ( n +2 redundancy): With four HBA ports, zone HBA ports to SAN Volume Controller ports 1:2 for a total of eight paths. 

Here, the term HBA port  is used to describe the SCSI initiator and SAN Volume Controller port  is used to describe the SCSI target. 

GLYPH<SM590000> Maximum host paths per logical unit (LU) 

For any volume, the number of paths through the SAN from the SAN Volume Controller nodes to a host must not exceed eight. For most configurations, four paths to an I/O Group are sufficient. 

Important:  The maximum number of host paths per LUN must not exceed eight. 

