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Re: dropped frames, slow raid write rates

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Re: dropped frames, slow raid write rates
by walter biscardi on Jun 30, 2009 at 1:12:00 am

[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.

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