Dell POWERVAULT MD3620I User Manual download pdf (Page 80)

80 Appendix—Load Balancing

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 one of the paths in the path

group of the RAID controller module that owns the virtual disk.

Least Path Weight With Subset

The least path weight with subset policy assigns a weight factor to each data

path to a virtual disk. An I/O request is routed to the path with the lowest

weight value to the RAID controller module that owns the virtual disk. If

more than one data path to the virtual disk has the same weight value, the

round robin with subset path selection policy is used to route I/O requests

between the paths with the same weight value. The least path weight with

subset load balance policy is not supported on Linux operating systems.

Changing Load Balance Policies on the Windows Server 2008 Operating

System

Load balancing with the PowerVault MD3600i series storage array is only

available for Microsoft Windows Server 2008 and later versions of the

operating system. You can change the load balance policies from the default

round robin with subset by using either the:

•Device manager

• Disk management

To change the load balance policy using Windows Server 2008 device manager:

From the desktop of the host, right-click

My Computer

and select

Manage

to open the

Computer Management

dialog box.

Click

Device Manager

to show the list of devices attached to the host.

Right-click the multi-path disk device for which you want to set the load

balance policies, then select

Properties

From the

MPIO

tab, select the load balance policy that you want to set for

this disk device.

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