By the way, to answer your question more directly, you should be getting between 5 and 600 on a 4-way stripe, so your performance is shitty.
Sent from my iPad
On Dec 28, 2012, at 10:33 AM, John Moore <bigfish@pacbell.net> wrote:
> I've put 4 4TB Hitachi Deskstar 7200 RPM drives in my new 12 core MacPro. Using one drive as startup and three for the raid strip made with disk utility. AJA system test yields 153.2MB/s Write and 240.4MB/s Read. AJA data calc shows 1920x1080 1080i 10 bit YUV data rate at 165.72 MBytes/sec. If both these are accurate wouldn't that mean I would have a potential bottleneck trying to capture uncompressed 1:1 in Avid? I was also surprised to see the AJA disk whack speed test came out around 100 MB/s write and 150MB/s read on the single startup drive. I would think the three way strip should be ball park 3 times faster. Is this lower than expected performance a product of the mac disk utility software raid? Am I oversimplifying the process thinking internal drives should be faster than some external connected storage solutions? I've been told internally the macpro is sata 2 not 3 but in googleing sata 2 can yield 300MB/s. Clearly I'm not
> fully clear on the data balistics of the MacPro internal drives. I have had decent performance with a 2 drive strip with DNX 220 on a MacPro SNDX 4.x. Never tried uncompressed on that config. Curious what others have done. I set the raid block size to 256K after reading a tutorial on how to set up the raid. Does that seem like an optimal block size? TIA
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> John Moore
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> Barking Trout Productions
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> Studio City, CA
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> bigfish@pacbell.net
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> [Non-text portions of this message have been removed]
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>
[Non-text portions of this message have been removed]
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