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Appendix—Load Balancing

Windows 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, the

driver tries to find a path to the current RAID controller module that owns

the virtual disk. If that path 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.

You can choose one of the following load balance policies to optimize

I/O performance:

•

Round Robin With Subset

The round-robin with subset I/O load balance policy routes I/O requests, in

rotation, to each available data path to the RAID controller module that

owns the virtual disks. This policy treats all paths to the RAID controller

module that owns the virtual disk equally for I/O activity. Paths to the

secondary RAID controller module are ignored until ownership changes. The

basic assumption for the round-robin policy is that the data paths are equal.

With mixed host support, the data paths might have different bandwidths

or different data transfer speeds.

Least Queue Depth With Subset

The least queue depth with subset policy is also known as the least I/Os, or

least requests, policy. This policy routes the next I/O request to a data path

that has the least outstanding I/O requests queued. For this policy, an I/O

request is simply a command in the queue. The type of command or the

number of blocks that are associated with the command are not considered.

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Round robin with subset

Least queue depth with subset

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Appendix—Load Balancing