Re: [Avid-L2] 3 way internal stripped raid on MacPro Speed?

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@pacbell.net<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@pacbell.net <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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