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Changes to DRS in vSphere 4.1 (1022842)

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Purpose

This article provides information about the changes to VMware Distributed Resource Scheduler (DRS) in vSphere 4.1.

Resolution

What's new?

DRS now provides more control by using Host Groups and Virtual Machine Groups. These groups, in combination with DRS rules, simplify management of the ESX host resources. For example, you can create a group of virtual machines that utilize a large amount of memory and create a rule that ensures that these virtual machines run in a group of ESX hosts that have the most memory available.
 
DRS now has soft and hard rules. Hard rules must be followed by DRS, whereas soft rules are followed by DRS if possible. 

DRS and FT

You can use VMware Fault Tolerance (FT) with DRS when the Enhanced vMotion Compatibility (EVC) feature is enabled. This allows fault tolerant virtual machines to benefit from better initial placement and allows them to be included in the cluster's load balancing calculations.
 
DRS is now capable of performing vMotion on virtual machines protected by the FT feature.

DRS and HA

DRS affinity rules are checked by VMware high Availability (HA) when failovers occur. HA works with DRS so that failed over virtual machines are not over or under allocated ESX host resources.
 
For more information, see our documentation.

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