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Dell PowerVault MD3800f and MD3820f Series Storage Arrays Deployment Guide

Load Balance Policy

Multi-path drivers select the I/O path to a virtual disk through a specific RAID controller module. When the multi-path driver receives a new I/O to process, the driver tries to find a path to the current RAID controller module that owns the virtual disk. If the path to the current RAID controller module that owns the virtual disk cannot be found, the multi-path driver migrates the virtual disk ownership to the secondary RAID controller module. When multiple paths to the RAID controller module that owns the virtual disk exist, you can choose a load balance policy to determine which path is used to process I/O. Multiple options for setting the load balance policies let you optimize I/O performance when mixed host interfaces are configured.

  • NOTE: For more information on Load Balance Policy, see your operating system’s manual and updates.

You can choose one of the following load balance policies to optimize I/O performance:

  • Round robin
  • Least queue depth
  • Least path weight (Microsoft Windows operating systems only)

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