System configuration requires that the relationship between physical servers and HBA WWNs from the perspective of the server, and the relationship between storage volumes and HBA WWNs from the perspective of storage devices be defined clearly.
An example where blades connect to storage devices via multiple paths using two HBA ports is shown below.
Refer to storage device manuals each storage device for details.
Note
Resource Coordinator VE does not support configurations where managed servers are mounted with three or more HBA ports.
Figure 3.8 WWN System Design
Choosing WWNs (when the HBA address rename function is used)
Choose the WWNs to use with the HBA address rename or VIOM function.
After WWNs have been chosen, associate them with their corresponding operating systems (applications) and physical servers (on the server side), and with corresponding volume(s) (on the storage side).
Using HBA address rename or VIOM, storage-side settings can be defined without prior knowledge of the actual WWN values of a server's HBAs. This makes it possible to design a server and storage system without having the involved physical servers on hand.
When HBA address rename is used, the value provided by the "I/O Virtualization Option" is used as the WWN.
When VIOM is used, set the WWN value with either one of the following values:
The value provided by the "I/O Virtualization Option"
The value selected automatically from the address range at VIOM installation
To prevent data damage by WWN conflict, you are advised to use the value provided by "I/O Virtualization Option".
Information
Specify the WWNN value provided by the "I/O virtualization Option". This can prevent unpredictable conflicts of WWNs.
Note
Do not use the same WWN for both HBA address rename and VIOM. If the same WWN is used, there is a chance data will be damaged.
The WWN format used by the HBA address rename and VIOM functions are as follows:
The "2x" part at the start of the provided WWN can define either a WWNN or a WWPN. Define and use each of them as follows.
20: Use as a WWNN
2x: Use as a WWPN
The "x" part should be set to the I/O address of each HBA adapter (in descending order).
I/O addresses of HBA adapters can be confirmed using the HBA BIOS or other tools provided by HBA vendors.
Example
For a server with two ports, WWNs could be configured as follows.
WWN value provided by "I/O Virtualization Option": 20:00:00:17:42:51:00:00 WWNN value for ports 1 and 2 of the HBA : 20:00:00:17:42:51:00:00 WWPN value for HBA port 1 : 21:00:00:17:42:51:00:00 WWPN value for HBA port 2 : 22:00:00:17:42:51:00:00
The WWN chosen here would be used for the system design of the servers and storage.
Server-side design
WWNs are used in server-side design by assigning one unique to each server.
Storage-side design
One or more volumes are chosen for each server, and the corresponding WWN assigned to each server in the server-side design is configured on the storage-side for those volumes.
Defining WWN settings for VIOM
VIOM should be configured first. Then, storage devices should be configured in accordance with the WWN settings that were defined within VIOM.
