HP StorageWorks XP Remote Web Console Software - Manual (Page 16)

16 LUN Manager for the XP128/XP1024
LU 00:00 (LUN 00). One path comes from the CL1-N port and the other path comes from the CL1-Q port.
Thanks to this two path configuration, hosts can access the user LU even if one of the paths fails.
Figure 2 LU paths configuration in a NAS environment
Notes:
• In a NAS environment, up to 256 LU paths can be defined for one NAS port.
• In a NAS environment, you cannot define LU paths to logical volumes unless they have the Read/Write
access attribute.
• The LUN Manager pane displays two host groups (User and NAS-Sys) below each NAS port. When
you define LU paths, you can use only the User host group; you cannot use the NAS-Sys host group.
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 XP128/XP1024. 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