Dell PowerVault MD3660f Series Посібник з розгортання - Сторінка 19

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Appendix — Load Balancing

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:

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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 may 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. The least queue depth with subset policy treats large block requests and small block requests

equally. The data path selected is in the path group of the RAID controller module that owns the virtual disk.

Load balancing with the PowerVault MD3660f series is only available for Windows Server 2008 or later versions of the

operating system. You can change the load balance policies from the default round robin with subset by using one of the

following:

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Device Manager options

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Disk Management options