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Silly John Fatty

macrumors 68000
Original poster
Nov 6, 2012
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I have some SSDs in my 5,1 Mac Pro right now, and I think the max. read/write speeds are somewhere around 500-600 MB/S from what I've seen in the tech specs of the SSDs I bought.

Probably it's less in practice.

But I was wondering if I could increase those speeds with a RAID system. If I got it right, RAID is basically merging all my SSDs to one single drive in Disk Utility.

Will I get more speed if I combine all my drives or have I reach the top already?

They're all just plugged in normally in the corresponding disk trays. It's two SSDs and one HDD.
 

MarkC426

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May 14, 2008
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SSD's in SATA ports will give you approx 250MB/s [sata 2].
If you put them on PCIe cards you will get the full 500MB/s [sata 3].

I have Sonnet Tempo cards in mine.
 
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Silly John Fatty

macrumors 68000
Original poster
Nov 6, 2012
1,744
460
SSD's in SATA ports will give you approx 250MB/s [sata 2].
If you put them on PCIe cards you will get the full 500MB/s [sata 3].

I have Sonnet Tempo cards in mine.

Amazing, so I've had my SSDs for nothing all these years. :):rolleyes: LOL.

These Sonnet adapters are really expensive, almost more than the SSD itself – at least when new.

When you look at used ones, however, they're super cheap. How come? Is there a lot of potential wear on these?
 

MarkC426

macrumors 68040
May 14, 2008
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Even in the Sata port it's vastly faster than a HDD.

OWC also do one

Also see here
 

Juicy Box

macrumors 604
Sep 23, 2014
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I have had up to three of the internal drives in a SW RAID0 on my Mac Pro 1,1 before, and it does increase the speed a lot. No issues with putting them in a striping RAID. Been doing it with many different drives for around 15 years.

What do you plan on using the potential RAID0 SSDs for?

I have also had two SATA SDDs in a SW RAID0 to use as a boot drive in my Mac Pro, and while I did not have issue for a long time, eventually, the speeds, especially write speeds, got slower. I don't know this for sure, but I suspect that TRIM wasn't working properly.

Not sure if TRIM wasn't working correctly because of it being in a SW RAID0 or because it was also being used as a boot drive.

I ended up going to just a single SSD as a boot drive.

I currently have two HDDs in my Mac Pro in SW RAID0 to hold my Plex Media Server files, and it is almost twice as fast as a single drive, and it hasn't had issues at all.

The only time I had an issue was when one HDD in a SW RAID0 failed about 10 years ago, I lost everything, but of course that is the risk with striping RAID. Luckily, I had a back up.
 

Macschrauber

macrumors 68030
Dec 27, 2015
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Germany
Amazing, so I've had my SSDs for nothing all these years. :):rolleyes: LOL.

These Sonnet adapters are really expensive, almost more than the SSD itself – at least when new.

When you look at used ones, however, they're super cheap. How come? Is there a lot of potential wear on these?

You didnt waste, ssd speed is about access time. If you do not do continuously data transfers I guess you will even not notice the double sata bus speed. For some reason I put my ssd off the PCIe controller and did not notice a slowdown.

Measuring and real world experience differ.

Anyway, in the meantime I use a NVMe with 1500 MB - but its not so much more faster than the ssd connected to the backplane in my other Mac Pros. Ymmv
 
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