HP StorageWorks LUN Configuration and Security Manager XP user guide for the XP10000/XP12000 (December 2005)

LUN Configuration and Security Manager XP user guide for the XP10000/XP12000 13
• Up to 255 host groups can be created for one Fibre Channel port.
• You cannot define any LU path to journal volumes.
• You cannot define any LU path to pool volumes.
16-Port FC/CA CHIP product
Although there is not a significant performance gain compared to the 8-port FC/CA CHIP product, the
primary advantage of the 16-port FC/CA CHIP product is its increased FC connectivity (or port count).
High-speed mode is currently unavailable on the 16-port FC/CA CHIP product.
Odd/even LUN data path handling through the processor does not exist on the XP10000/XP12000.
There is no odd/even LUN mapping issue associated with this product. Each processor of the 16-port CHIP
product handles the data flow of two ports (eight total processors for 16 total ports = two ports per
processor).
For load balancing, the two ports serviced by a processor should be considered as one port. Although
volumes can be mapped to both ports handled by a processor, the I/O will go through one processor. For
redundancy and performance reasons, consider distributing the load across multiple CHIPs.
When deciding whether to map volumes to ports (LUN mapping) for host connectivity, after considering
load balancing across processors, there is no reason to not use all 16 ports immediately. After considering
load balancing among processors, there is no reason not to use both ports in the I/O path of one
processor or to use both ports in the I/O path of a processor.
Figure 2 16-Port CHIP pair labeling
Port numbering is as follows: Cluster 1 uses CL1-* and CL3-*, while Cluster 2 uses CL2-* and CL4-*,
where * is an alphabetical character designation of the port such as A, B, C, and so on. Ports A, for
example, CL1-A and CL3-A, share the same processor for I/O purposes.
Host groups
Begin by grouping server hosts into host groups. For example, if HP-UX and Windows hosts are connected
to the disk array, you must create a separate host group for each host type. When this is done, register the
hosts in their corresponding host groups. After hosts are classified into host groups, associate the host
groups with LUs.