The Data-Crunching Powerhouse Behind ‘Avatar’: Inside Weta Digital’s 2009 Render Farm

The original Avatar relied on a purpose-built, high-density data center at Weta Digital in Wellington, New Zealand—not cloud rendering. A 2009 report described thousands of HP blade servers, high-speed networking, shared storage and custom cooling working together to render the film’s visual effects.

What powered Avatar’s original visual effects?

Weta Digital’s server farm occupied 10,000 square feet on the studio’s Wellington campus, according to John Rath’s December 22, 2009 report for Data Center Knowledge. The facility had been refreshed and redesigned in 2008 to meet the demands of the studio’s work.

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The reported equipment included more than 4,000 HP BL2x220c blade servers, Foundry 10 Gigabit Ethernet networking gear, and storage from BluArc and NetApp. Rath also described a computing core of 34 racks and 32 machines, “made of 32 machines each with 40,000 processors and 104 terabytes of memory.” That sentence does not make the relationship among the rack, machine and processor counts clear, so its figures should be read as the report’s wording rather than a precise modern hardware specification.

These are historical figures for the facility described in 2009, not a description of Weta’s current infrastructure or a benchmark for today’s computers.

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Why storage and data movement mattered

Rendering was not only a matter of adding processors. Artists needed rapid access to large working files, including updated master textures, and the render farm had to move those files efficiently to the machines using them.

In a February 3, 2010 release, NetApp described a FlexCache-based storage system that provided frequently used textures to more than 35,000 rendering cores. The company said the system automatically balanced renderwall throughput and handled a workload with many unique data hosts, read-heavy access and large numbers of medium-sized files. NetApp reported a 95 percent reduction in manual data movement and management, and an improvement of more than 40 percent in storage price-to-performance ratio; those results are the vendor’s claims, not independently verified measurements.

Weta Digital CTO Paul Ryan said in the release, “A traditional storage approach would have made it very difficult to manage the workload required for ‘Avatar.’”

How the facility handled heat and bandwidth

High equipment density supported the bandwidth the studio needed, but it also created a cooling challenge. Weta systems administrator Paul Gunn told Data Center Knowledge: “We need to stack the gear closely to get the bandwidth we need and, because the data flows are so great, the storage has to be local.” The report says Weta used water-cooled racks from Rittal and that conventional raised floors and forced-air cooling could not keep up with the machines’ constant heat output.

Rath’s report said the system handled 7–8 gigabytes of data per second in the last month or more of production while running 24 hours a day. It also reported a 40 percent lower cooling cost for a data center of its type, without giving a comparison baseline or measurement method. Both figures belong to that article’s account of the 2009 facility, not to a general rule for render farms.

How the original film differs from later cloud production

The original Avatar render farm described in 2009 was an on-premises operation. Cloud rendering belongs to a later chapter: in September 2020, Amazon announced a multi-year agreement under which Weta Digital planned to move the vast majority of its IT infrastructure to AWS, supporting cloud visual-effects work and remote collaboration. The announcement said the pipeline included 100 proprietary tools; it does not show that the 2009 film used AWS.

For Avatar: The Way of Water, AWS’s February 2023 account says Wētā FX ran 3.3 billion thread hours on AWS over eight months, after an initial workflow setup of about 14 months. AWS also reported that the production involved more than three hours of content and 3,000 visual-effects shots, with more than 40 percent generated at 48 frames per second and deliverables in 4K and 8K. These are sequel-era figures reported by AWS, not measurements for the first film. Wētā FX executive VFX producer David Conley told AWS, “The only way this really works is if we protect the IP.”

Rendering was one part of a wider production pipeline

Computing capacity helped generate and manage visual effects, but it was part of a broader production process. An Autodesk announcement from 2012 described virtual production spanning worldbuilding, character development, previsualization, performance capture, virtual cinematography, visual effects and final rendering. It identified MotionBuilder and Maya tools in the Entertainment Creation Suites 2013. That account provides workflow context; it does not establish that either software product alone created the film’s final imagery.

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