Bandwidth-hungry Atlab, which has 30T bytes of SAN space in Sydney, and recently added 20TB in Melbourne to handle the award-winning Rolf de Heer film Ten Canoes, has found speed critical in handling the massive digital files produced when a movie is scanned and stored on the SAN, which is an Silicon Graphics Inc. InfiniteStorage TP9700 system supported by integrator Intraware.

A typical film requires around six terabytes of disk space, but this can expand during production as color graders, directors and photographic experts apply color, tonality and other changes to the digitized images.

Reviewing those changes in real time meant Atlab's network needed to deliver video at film-speed 24 frames per second. With an average frame consuming 50M bytes of space, that equates to a throughput of 1.2GBs. Even using smaller half-resolution frames requires sustained data transfers of 380MB per second.

Meeting this requirement has made Atlab an eager adopter of fast networking technology, with 4Gbps Fibre Channel connections linking SAN devices and 10GigE connecting the SAN to an HP switch providing 1Gbps Ethernet links to around 20 workstations. Once 10Gbps Fibre Channel technology is widely available, it is likely to drive a SAN upgrade matched by 10GigE to the desktop, says Robert Sandeman, digital services with Atlab.

"We're always looking for speed," he says. "Working in the way that we do, our primary concern is with I/O, not with high computational processing. We have to have enough speed to get the film in front of the director, so he can be confident that when he looks at the digital image playing at 24fps he knows he's seeing it in the correct way."