HP Surestore Disk Array FC60 HP SureStore E Disk Array FC60 - (English) Advanc - Page 247
Assigning LUN Ownership, Selecting a RAID Level
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Assigning LUN Ownership When a LUN is bound, you must identify which disk array controller (A or B) owns the LUN. The controller that is assigned ownership serves as the primary I/O path to the LUN. The other controller serves as the secondary or alternate path to the LUN. If there is a failure in the primary I/O path and alternate links are configured, ownership of the LUN automatically switches to the alternate path, maintaining access to all data on the LUN. When assigning LUN ownership, consider the following: • To ensure optimum performance, LUN ownership should be balanced between controllers. This ensures that one controller is not overloaded with I/O requests, while the other is idle. • Controller ownership can be changed on an existing LUN without impacting its operation. If you find that there is an imbalance between I/O path loads, you can change the ownership of one or more LUNs to solve the problem. Note Does the primary path selected using LVM impact LUN ownership? Yes. The primary I/O path established using LVM defines the owning controller for the LUN. This may override the controller ownership defined when the LUN was bound. For example, if controller A was identified as the owning controller when the LUN was bound, and LVM subsequently established the primary path to the LUN through controller B, controller B becomes the owning controller. Selecting a RAID Level CAUTION RAID 0 does not provide data redundancy. It should only be used in situations where high performance is more important than data protection. The failure of any disk within a RAID 0 LUN will cause the loss of all data on the LUN.. RAID 0 should only be used for non-critical data that could be lost in the event of a hardware failure. The RAID level you select for each LUN determines the method used to store data on the disks. Once selected, the RAID level cannot be changed dynamically. If you want to change Managing the Disk Array on HP-UX Managing Disk Array Capacity 247