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http://support.citrix.com/proddocs/topic/ns-api-map/ns-nitro-api-wrapper-con.html

NITRO API - Citrix eDocs

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What is HA

The upper part of this picture shows a cluster where the left node is currently active, i.e., the service's IP address that the client machines are talking to is currently on the left node. The service, including its IP address, can be migrated to the other node at any time, either due to a failure of the active node or as an administrative action. The lower part of the illustration shows a degraded cluster. In HA speak the migration of a service is called failover , the reverse process is called failback and when the migration is triggered by an administrator it is called switchover . → Continue with What DRBD does http://www.drbd.org/home/what-is-ha/
Pay-As-You-Grow elasticity Pay-As-You-Grow is a simple licensing model that provides 5x faster performance on demand, with no new hardware for better investment protection. Deploy only what you need No need for expensive hardware refreshes to increase performance. http://www.citrix.com/English/ps2/products/subfeature.asp?contentID=2323073

NetScaler Features - Cloud Scale

http://haproxy.1wt.eu/10g.html 2009/08/23 - Quick test of version 1.4-dev2 : barrier of 100k HTTP req/s crossed Introduction 2009/04/18 - New benchmark of HAProxy at 10 Gbps using Myricom's 10GbE NICs (Myri-10G PCI-Express)

HAProxy - The Reliable, High Performance TCP/HTTP Load Balancer