To make the raid with Disk Utility I didn't format the individual drives first, could that be a factor? I dragged the drives into the raid box having done nothing to them prior. I choose HFS+ not journaled figuring that would be better for media. The raid was created and I set it to 256 block size because that was mentioned as an appropriate size for video files in a tutorial I found. I suppose if this truely is subpar performance I should break up the raid and test each drive individually and see what they clock at when they are a single volume. Maybe that would weed out if a particular drive is under performing. I realize a hardware raid is better than Apples software raid but I've had plenty of systems work fine with them for 1080i DNX 220 shows on a 2 drive stripe. An occasional disk stall but nothing I couldn't live with.
--- In Avid-L2@yahoogroups.com, electropura212 <electropura212@...> wrote:
>
> Something is very wrong with one or more of your drives in the RAID.
>
> Even in a first generation Mac Pro you should be getting well over 400MB/s
> on
>
> On Friday, December 28, 2012, Greg Huson wrote:
>
> > **
> >
> >
> > John,
> >
> > I'm going to get all Bob Z on you here and ask, 'Why don't you just do
> > what I tell you?'
> >
> > MacPros don't run at SATA3- they only run SATA2, but the drives are
> > backwards compatible. I've had some trouble with 4tb drives in 'toasters'
> > or external FW cases, but they seem to work reliably in the macpro. I don't
> > have access to any of our bays now, but I'm pretty sure I get better speeds
> > than that.
> >
> > Keep your boot drive lean- get rid of all the 'template' content you
> > install when you install when you install all FCP and Adobe - it should be
> > 80-90 gig if you have a bunch of apps. Go to Fry's and get the biggest SSD
> > you can afford - certainly no smaller than about 120, but 256 is better.
> > (You could also order it from crucial or someone like that - you don't need
> > the top-end, anything will do, but fry's runs a loss-leader specials all
> > the time)
> >
> > Install the SSD drive in the lower optical drive slot. You can attach it
> > to the side with a single screw, or buy a fancy adapter plate, but,
> > honestly, they're so lightweight it doesn't seem to hurt just to let it
> > hang in there.
> >
> > Clone your OS to the SSD, restart the computer on the SSD. You'll find
> > boot times, software install times, and general responsiveness to be
> > dramatically improved. I get very annoyed now when working on a machine
> > that DOESN'T have an SSD boot drive because they seem so slow.
> >
> > Then, re-configure the raid as a 4-way stripe. Not sure you'll get better
> > access times, but you should.
> >
> > Remember to keep your desktop fairly clean and clear caches, download
> > files, etc., periodically so you don't fill up the no longer massive boot
> > drive.
> >
> > There's a piece of free software that graphically shows you how your
> > storage is being used - can't remember what it's called - grand overview or
> > something like that - if you need to figure out what junk you can delete
> > from your boot drive before cloning.
> >
> > Greg H, on vacation, waiting for my slumbering wife to appear. Happy New
> > Mac, john.
> >
> > Sent from my iPad
> >
> > On Dec 28, 2012, at 10:33 AM, John Moore <bigfish@...<javascript:_e({}, 'cvml', 'bigfish%40pacbell.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
> > >
> > > John Moore
> > >
> > > Barking Trout Productions
> > >
> > > Studio City, CA
> > >
> > > bigfish@... <javascript:_e({}, 'cvml',
> > 'bigfish%40pacbell.net');>
> > >
> > > [Non-text portions of this message have been removed]
> > >
> > >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
>
>
> [Non-text portions of this message have been removed]
>
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