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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

SSD RAIDS...

What about the new 1TB SSDs that have hit the market?

Mark L. Pederson said:
Cheetah ST3600057SS is very quiet. SSD will always be silent and lighter than spinning disks - but ... for 4T+ you need 16 256Gs SSDs as opposed to 7 600G SAS drives. 7 of those Cheetah's in a RAID zero will be insane. Even at RAID 5 it will mostly likely be faster than you need.
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That includes RAID 0?

Matt Stone said:
Regardless of what you do, the write performance of an SSD or SSD raid group will diminish over time, no matter what.
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Will Keir said:
What about the new 1TB SSDs that have hit the market?
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As Matt said, there are already working on it, and testing and testing the new 1TB (960GB) Sata III SSD's to insure they deliver the absolute best and fastest set up possible, only current downfall is that they do not self power via USB, and need AC.

Once all specs are written in stone and all testing done to be able to have chosen the absolute best and fastest Single and Double Cassis choices, we might actually try and bring a Group Buy together... If you want tone that is... ;)
 
back at it, any updates?

Samsung's 840 EVO SSD looked good in September. As well as the Crutial M500.
 
The performance diminishes on the SSD drive arrays because the garbage fills the drives over time. The Firmware is suppose to clean that up as the drive is used but often times it's inefficient or files are written to the drive often. To reset the performance you simply have to format the array or run a clean command on the array or individual drive. This becomes a standard maintenance process when running SSD arrays.

The Crucial M500 960GB Drives perform excellent in raids. 5 of those in a Raid 5 give 1.8GB/s to 3GB/s bandwidth.
 
Using a Mac Pro (4,1) I am limited by the internal bus somewhere?

So 4x Crucial M500s would max at what speed?

Eric Bowen said:
The Crucial M500 960GB Drives perform excellent in raids. 5 of those in a Raid 5 give 1.8GB/s to 3GB/s bandwidth.
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You would not be limited by the bus with a SAS controller provided you had the correct slot with 8X bandwidth for the current controllers.

4X Crucial M500's in raid 5 were testing at 1.2 to 1.8GB/s

Eric
ADK
 
Well I'd just be using the 4 internal HDD slots in my 2009 Mac Pro. I think that's the limitation if I remember Jeff's advice correctly. Somewhere around 600MB/s max.


Eric Bowen said:
You would not be limited by the bus with a SAS controller provided you had the correct slot with 8X bandwidth for the current controllers.

4X Crucial M500's in raid 5 were testing at 1.2 to 1.8GB/s

Eric
ADK
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Too many PCI slots taken up. I have a SAS RAID now. Looking for a simple solution with SSDs, faster boot and the ability to put my computer to sleep. Does it hard a SSD RAID 0 to sleep it?

Just trying to figure out the speed of 4 SSDs in RAID 0 in the internal bays 1-4 before I buy in. Any help appreciated. Thanks.

Eric Bowen said:
The internal ports are 3Gbs and you wont get the full performance of the SSD's. I would suggest a SAS controller for this.
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No it does not hurt the SSD's to sleep the system. The transfer rate would be half. What raid level would you run on the onboard ports?
 
If you want something that works in a current Mac Pro and you're looking for speed, versatility and good prices you should look at this one. Just got one and popped in a couple of OCZ Vertex 4 SSDs 120 GB and raided them together in Disk Utility and installed mountain lion on it. I'm getting around 750 MB/sec from it and after hardware initialisation it boots up OSX in under 6 seconds. Apparently it does HyperDuo (sort of Hybrid drive with SSD and HDD combined) too, but haven't tried that myself. It's only $75 and if you have a couple of SSD lying around it's a perfect option. Also - it gives you a couple of extra internal SATA3 ports if you have additional drives.

http://www.ebay.com/itm/NEW-SSD-SAT...sk_Controllers_RAID_Cards&hash=item3cd876575a
 
Bummer. OCZ was making good stuff lately. Maybe they'll pull through, but it's hard out there right now.

Currently the OCZ Vertex 5 and the Samsung 840 are my go-to SSD's. I've been very happy with my Vertex 4 SSDs as well.
 
Yeah, I've been very satisfied with the OCZ drives too - sad to see them go.
 
Benchmark posting time?Here is one from my pair of raid 0 (OS raid) OCZ Vertex 4
 

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Just thinking a RAID 0 for speed.

All projects stored on external Raid 5s.

Eric Bowen said:
No it does not hurt the SSD's to sleep the system. The transfer rate would be half. What raid level would you run on the onboard ports?
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I keep going over this one:

For a internal RAID 0 configuration using the HDD bays in my 2009 Mac Pro.

- 2x 1TB SSDs
- 4x 500GB SSDs
- 4x 250GB SSDs

I'm thinking I only need 1TB of storage for all my apps and temp space...

I believe Samsung is the right choice for two reason.

1) They'll be around if I ever need a replacement.
2) User recommended reliability.

Choices
Samsung 840 Evo
Samsung Pro - 5 Year Warranted (more than enough)
 
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