Dell PowerVault MD3200i Deployment Guide - Page 76
Least Queue Depth with Subset, Least Path Weight with Subset
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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 MD3200i Series storage array is only available for 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: 1 From the desktop of the host, right-click My Computer and select Manage to open the Computer Management dialog. 2 Click Device Manager to show the list of devices attached to the host. 3 Right-click on the multi-path disk device for which you want to set the load balance policies, then select Properties. 4 From the MPIO tab, select the load balance policy that you want to set for this disk device. 76 Appendix-Load Balancing