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Device Manager Guide, Cisco ACE 4700 Series Application Control Engine Appliance
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Chapter 6 Configuring Real Servers and Server Farms
Configuring Dynamic Workload Scaling
Configuring Dynamic Workload Scaling
This section describes how to configure the ACE Dynamic Workload Scaling (DWS) feature. DWS
enables an ACE to burst traffic to a remote pool of VMs when the average CPU or memory usage of the
local VMs has reached a specified maximum threshold value. When the usage drops to a specified
minimum threshold value, the ACE stops bursting traffic to the remote VMs. For more information about
the Dynamic Workload Scaling feature, see the “Dynamic Workload Scaling Overview” section on
page 6-4.
DWS requires configuring an ACE with the following:
• Nexus 7000 Series switches—XML interface IP address of the local Cisco Nexus 7000 series
switches that the ACE polls to obtain VM location information (local or remote).
Note With Device Manager software Version A5(1.2), you can specify up to two Nexus 7000
switches that the ACE is to poll. With Device Manager software Version A5(1.1), you can
specify only one Nexus 7000 switch.
• VM Controller—IP address of the VM Controller (also known as VMware vCenter Server) that the
ACE sends a health probe to monitor local VM load.
• VM probe—Probe that the ACE sends to the VM Controller to monitor local VM load based on CPU
usage, memory usage, or both (see the “Configuring Health Monitoring” section on page 6-39).
• Server Farms—Groups of networked real servers (physical servers and VMs) that provide content
delivery. See the “Configuring Server Farms” section on page 6-18.
Note To enable the ACE to use the VMs associated with DWS for load balancing, you must configure them
as real servers on the ACE (see the “Configuring Real Servers” section on page 6-5).
Prerequisites
Dynamic Workload Scaling requires the following configuration elements:
• A Cisco Nexus 7000 Series switch configured for DCI/OTV in the local data center and in the
remote data center. For details about configuring a Nexus 7000 for DCI/OTV, see the Cisco Nexus
7000 NX-OS OTV Configuration Guide, Release 5.x.
• VMware vCenter Server 4.0 or later.
• Multiple local and remote VMs configured as real servers and associated with server farms
configured on the ACE.
• ACE backend interface MTU set to 1430 or less to accommodate DCI encapsulation and the Don’t
Fragment (DF) bit is automatically set on the DCI link. For details about setting the ACE MTU, see
the Routing and Bridging Guide, Cisco ACE Application Control Engine.
This section contains the following topics:
• Configuring and Verifying a Cisco Nexus 7000 Connection, page 6-15
• Configuring and Verifying a VM Controller Connection, page 6-16
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