What happens when a cache fails
• Cached objects are not available
• Backend traffic surges
• Page load time spike
What is VHA?
• High availability for Varnish Plus
• Circular, multi-master replication
• Does not require additional HA components
Applicability
• Business critical Varnish Plus installations
• Any multi-cache Varnish setup
• Two/three node CDN POP installations
Implementation
• Memory impact is less than 100M. Threaded architecture with 10 threads as the default
• Statistics are delivered through a file.
• Capacity is ~ 1000 objects/sec with default configuration
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