Re: dropped frames, slow raid write rates

[Jason Longo] "When I ran the AJA system test without the "Simultaneous KONA DMA" box checked, I get write rates of 160mb/sec and read rates of 215 mb/sec. When I check the "Simultaneous KONA DMA" box those rates drop to Write 44mb/s and read 98mb/s. "

Those speeds are barely enough to capture Uncompressed HD. You need a bigger, faster array if you want to work there or a different type of connectivity to the Mac to increase the speeds. Drop down to ProRes and you should be fine.

Years ago I had an 8 drive, 2TB Medéa Ultra SCSI array that ran something like 270MB/s so it worked fine for Uncompressed HD, but that was a very fast, 2 channel connection to the Mac.



Walter Biscardi, Jr.
Biscardi Creative Media
HD and SD Production for Broadcast and Independent Productions.

Read my Blog!

STOP STARING AND START GRADING WITH APPLE COLOR Apple Color Training DVD available now!