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Understanding SATA RAID.

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Ben Edwards
Understanding SATA RAID.
on Aug 17, 2012 at 2:38:20 pm

Hi, been trying to get my head around if I would benefit from a SATA III enclose rather than the SATA II one I have. I should add I am using RAID0 in a cheapish DUAL RAID USB3 enclosure. I am a student building a storage system for video editing (mainly SDLR footage in Premiere Pro). I have 2 Barracuda 72000 2GB drives and seem to be getting around 180 Megabytes/Second (RAID0).

In terms of understanding transfer speeds I found this:

"SATA II (revision 2.x) interface, formally known as SATA 3Gb/s, is a second generation SATA interface running at 3.0 Gb/s. The bandwidth throughput, which is supported by the interface, is up to 300MB/s.

SATA III (revision 3.x) interface, formally known as SATA 6Gb/s, is a third generation SATA interface running at 6.0Gb/s. The bandwidth throughput, which is supported by the interface, is up to 600MB/s. This interface is backwards compatible with SATA 3 Gb/s interface."
http://kb.sandisk.com/app/answers/detail/a_id/8142/~/difference-between-sat...

So is the GB/s specified in SATA gigabits, not bytes, a second. What I am finding a little confusing is why SATA III is needed for 72000 Drives. Everything I have read a single drive tends to deliver under 200 Megabytes/Second so this would indicate SATA II is sufficient (I am talking drives such as Seagate Baracuda 72000).

Any insight gratefully confused.

Ben

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Ben Edwards - Freelance Picture Editor
http://www.funkytwig.com

i5 550, Windows 7 / Mac Lion, Nvida 550 Ti, 8GB Mem


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David Gagne
Re: Understanding SATA RAID.
on Aug 17, 2012 at 8:44:53 pm

For a non SSD SATA2 is completely fine, as you won't touch the performance of SATA3.
SATA2 theoretical max: 375MB/s (although a drive will only do 200)
SATA3 is double that (drive still only does 200)
USB3 is 5Gb/s (625MB/s).

A couple of reasons why you would go 6Gb SATA3 -- compatibility. Some newer drives do 6Gb by default and you have to jumper them to switch them to 3Gb otherwise they won't work with SATA2. Also the latest models are all SATA3, while older ones are SATA2... do you want an old SATA drive? Probably not...


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Ben Edwards
Re: Understanding SATA RAID.
on Aug 17, 2012 at 11:52:29 pm

Thanks a lot for that, I thought that was the case. I put a couple of 7200 Barracudas is a SATA II RAID0 enclosure and got around 180MS/s out of them. I was wondering if there was any point in looking for SATA III RAID0 enclosures, answer seems ot be no.

Also I only have a standard PCI, Not PCI-E slot left in my MB and wanted to add a SATA card. Seems getting a SATA II standard PCI card is almost imposable.

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Ben Edwards - Freelance Picture Editor
http://www.funkytwig.com

i5 550, Windows 7 / Mac Lion, Nvida 550 Ti, 8GB Mem


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Alex Gerulaitis
Re: Understanding SATA RAID.
on Aug 18, 2012 at 12:58:13 am

[Ben Edwards] "I was wondering if there was any point in looking for SATA III RAID0 enclosures, answer seems ot be no. "

One exception could be a port-replicated eSATA with, say, 4 drives hanging off of it, like with G-Speed eS. In that case, making it SATA III may give some tangible performance benefits.

Alex Gerulaitis
Systems Integrator
DV411 - Los Angeles, CA


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Ben Edwards
Re: Understanding SATA RAID.
on Aug 18, 2012 at 1:48:37 pm

Thanks for that. I just got http://www.ebay.co.uk/itm/320895315434?ssPageName=STRK:MEWNX:IT&_trksid=p39... which I think is a port replicator with 2 channels but I was only planing on using it with 2 drives.

--
Ben Edwards - Freelance Picture Editor
http://www.funkytwig.com

i5 550, Windows 7 / Mac Lion, Nvida 550 Ti, 8GB Mem


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