HP StorageWorks 16-EL HP StorageWorks Zoning V3.1.x/4.1.x User Guide (AA-RS26C - Page 59
Port allocation, Single HBA, accesses tape devices
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Zoning Concepts and Guidelines Port allocation There is an option to zone based on switch port rather than the WWN of the device. This provides some security to the fabric, but requires very solid processes to prevent the incorrect device from being attached to the wrong ports. This form of zoning should be avoided unless the administration team has very rigidly enforced processes for port and device allocation in the fabric. It does however provide some positive features. For instance, when a storage port, server HBA, or tape drive is replaced, the change of WWN for the new device is of no consequence. As long as the new device is connected to the original port, it will continue to have the same access rights. The ports on the edge switches can be pre-associated to storage ports and control of the fan-in ratio can be established. With this technique, the administrative team could not overload any one storage port by associating too many servers with it. Single HBA This method of zoning most closely re-creates the original SCSI bus. Each zone created has only one HBA (initiator) in the zone. Then each of the target devices that the initiator should access is added to the zone. Typically, a zone would be created for the HBA, and the disk storage ports would be added. If the HBA accesses tape devices, a second zone is created with the HBA and associated tape devices in it. In the case of clustered systems, it may be appropriate to have an HBA from each of the cluster members included in the zone. This is equivalent to having a shared SCSI bus between the cluster members. This presumes that the clustering software provides a methodology to manage access to the shared devices. In a large fabric, this does require the creation of possibly hundreds of zones. However, each zone would contain only a few members. Zone changes would affect the smallest possible number of devices. The impact of an incorrect zone change would be minimized. This zoning philosophy is the preferred method. Zoning Version 3.1.x/4.1.x User Guide 59