RAID 0 will not really change your access time but will increase total
throughput linearly, but limited by hardware and software. In this case,
both. Your RAID 0 is a software based, while it is convenient it will
not give you the numbers compared to hardware based RAID.
With SSD, you have to be aware that TRIM support may not be active with
non Apple drives. There are couple of ways to enable it. Google it as it
is imperative with SSD.
Also, tests show that leaving around 25% of the drive unused (not even
formatted) will improve the long term performance of your SSD.
http://www.anandtech.com/show/6489/playing-with-op
HTH
On 12/28/2012 5:42 AM, 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> 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
>>
>> [Non-text portions of this message have been removed]
>>
>>
>
> [Non-text portions of this message have been removed]
>
>
>
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