HP MPIO, Installation And Reference Manual, Page: 25 / 53

4 Adaptive Load balance
The HP MPIO EVA DSM implements array speci fi c load balancing algorithms that utilizes certain features
supported by the disk arrays, to deliver better performance for host I/O requests. The Adaptive Load
Balance (ALB) setting is supported on a per logical unit basis and works in conjunction with the load
balancing policies supported by the DSM, which includes Round Robin, Shortest Queue Requests,
Shortest Queue Bytes, and Shortest Queue Service Time.
By default, ALB is disabled for the newly discovered LUN. If the newly discovered LUN is part of any
Logical Unit Group, the ALB setting of the existing group prevails.
NOTE:
•
All devices that are part of the Logical Unit Group, has the same ALB setting.
• The ALB setting is not applicable for devices that have the
No Load Balancing policy
enabled.
• The ALB setting for a given LUN is persistent across host system reboots.
You can modify (enable/disable) the ALB setting for a given LUN either through the HP MPIO DSM
Manager or the HP DSM CLI. See Managing storage arrays with HP MPIO EVA DSM CLI utility for
more information.
HP MPIO Full Featured DSM for EVA4x00/6x00/8x00 family of Disk Arrays 3.00.00
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