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50 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 in the path group of the
RAID controller module that owns the virtual disk.
Changing Load Balance Policies in Windows Sever 2008
Load balancing with the PowerVault MD3200 series 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 one of the following:
•Device Manager options
• Disk Management options
Changing the Load Balance Policy Using Windows Server 2008 Device
Manager Options
1
Right-click
My Computer
and select
Manage
to open the
Computer
Managemen
t window from the host desktop.
2
Click
Device Manager
to show the list of devices attached to the host.
3
Right-click the multi-path disk device for which you want to set load
balance policies, then select
Properties
.
4
Select the load balance policy you want to set for this disk device from the
MPIO
tab.
book.book Page 50 Thursday, July 18, 2013 5:56 PM