Citrix TriScale clustering – new in NetScaler 10 – ensures that the app delivery infrastructure always has the capacity and performance to handle the demands of even the most intensive application or service. It provides enterprises and service providers the ability to scale out capacity to massive levels by enabling up to 32 NetScaler appliances, physical or virtual, to work in unison to deliver one or more applications. It also provides an alternative to high-availability (HA) ADC appliance deployments, so that 100% of network resources are put to productive use.
Breakthrough 3 Tbps+ scale for application delivery
Two to 32 NetScaler appliances can be clustered together to scale ADC capacity beyond 3 Tbps+. Because capacity can be added incrementally, and only when needed, datacenter managers can achieve cloud-like scale without making major capital investments in expensive chassis-based systems, or massively overprovisioning their network.
Preserve simplicity with unified cluster management
NetScaler clusters simplify operational management tasks by providing a single policy management view for the entire cluster. All aspects of ADC management remain constant, even as the cluster expands to meet future growth. Policy changes are made just once, and automatically propagated across all nodes. Additionally, the cluster architecture aggregates all performance and traffic statistics for all nodes so that the NetScaler administrator maintains a single view of all activity, events, logs, reports, etc.
Full high availability
Clustered nodes automatically synchronize information so the failure of any one node does not force an application client to completely restart their session. The reliability benefits of a traditional active-passive HA pair is preserved – but without the inefficiency of deploying idle hardware.
TriScale enables the NetScaler appliance cluster to appear as a single resource (i.e. single virtual IP address) to all users, preserving the transparency that has made ADC deployment fundamental and strategic within modern datacenter designs.
Complete performance scaling
Intelligent clustering expands application delivery capacity as measured against all performance metrics, including total traffic throughput, TCP and application transaction rates, concurrent user counts, SSL transaction rates, and more. NetScaler customers can completely leverage all ADC appliance capacity that is deployed.
Seamless, linear scalability
Adding or removing nodes from a NetScaler cluster incurs zero downtime and results in a predictable, linear change to aggregate performance and capacity. New nodes added to a cluster immediately advertise themselves and automatically begin to absorb their share of the load.
Multiple methods for distributing traffic among nodes in a cluster enable IT managers to select the best mechanism to meet their application and datacenter needs. In addition, cooperative health checks ensure that the health of backend web and application servers is monitored efficiently, avoiding the need for every node to interrogate the status of every back-end server.