Logical block MPxIO load balancing method
Last updated on JANUARY 28, 2016
Applies to:Sun Storage Traffic Manager Software - Version 3.0 and later
Logical block MPxIO load balancing is an efficient method that improves performance for devices using the MPxIO device driver, and special devices which have pre-fetch cache algorithm like Hitachi Data Systems 99x0.
For example: if a storage array presents a LUN via multiple paths and hence multiple storage array controllers which have pre-fetch cache, then following a read operation the path (array controller) just accessed will pre-fetch the next blocks of data. If you have a mostly sequential workload it would make sense to access the next read from the same path (array controller) just used, as the next data will already be cached on the array controller. In such a scenario you would consider using Logical block load balancing..
The MPxIO load balancing method is available with the Sun StorEdge SAN Software 4.4 (Solaris 8 and 9) and Solaris 10 and 11 versions of scsi_vhci and MPxIO driver. It is configured through the "device-type-mpxio-options-list" property. This document offers advice on configuring and using the new load balancing method.
Please note: always consult your storage vendor's recommendations when selecting a load balancing method. They will know the best settings for their storage under specific workloads and hence are the correct source for such configuration settings.
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