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 PostPost subject: SATA II RAID Controller Issues        Posted: Tue Jan 06, 2009 5:26 am 
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Hi everybody, it's been a while since I've been active on the forums. Hope everyone is doing well.

Here's my issue. I have a Dell Optiplex GX280 computer and I'm trying to squeeze as much performance as possible out of it. I bought a JMicro PCI-E SATA II RAID controller about 3 months ago (rated for 3.0GB/s) and an 80GB WD Raptor (WD800ADFS), also rated for 3.0GB/s. I just bought a second identical drive and put both drives in a RAID 0 config for a total of 160GB. The problem is I don't notice much of an improvement and when I benchmarked the drives using HD Tach to verify, my max sustained transfer rate was 167Mb/s....which is just slightly over SATA I speed. I've made sure that I had no other programs or disk-thrashing processes running while performing these tests. Anyone have any ideas as to why I'm limited to around 160-170Mb/s? Thanks!

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 PostPost subject: Re: SATA II RAID Controller Issues        Posted: Tue Jan 06, 2009 1:14 pm 
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You're lucky to get 170MB/s... You're limited by the disks ability to read/write at such a speed. Just because the controller is 3Gb/s doesn't mean you'll get it. Same with 1Gb/s networking. I have 2x80GB disks in RAID0 and I only get 80MB/s sustained write speeds, which is very good for those drives. The average drive only has a 50MB/s write/read figure.

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 PostPost subject: Re: SATA II RAID Controller Issues        Posted: Wed Jan 07, 2009 12:03 am 
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Andy wrote:
You're lucky to get 170MB/s... You're limited by the disks ability to read/write at such a speed. Just because the controller is 3Gb/s doesn't mean you'll get it. Same with 1Gb/s networking. I have 2x80GB disks in RAID0 and I only get 80MB/s sustained write speeds, which is very good for those drives. The average drive only has a 50MB/s write/read figure.


Well, that's what I figured, however I would have thought that two Raptors, spinning at 10,000RPM each, would together have a combined throughput of at least close to 3.0Gb/s. I think they were right when they said that SATA II was a bit ahead of it's time. It seems SSD's can take better advantage of the speed. Anyone else having better data throughput rates with a RAID array?

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 PostPost subject: Re: SATA II RAID Controller Issues        Posted: Wed Jan 07, 2009 12:05 am 
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4tified wrote:
Andy wrote:
You're lucky to get 170MB/s... You're limited by the disks ability to read/write at such a speed. Just because the controller is 3Gb/s doesn't mean you'll get it. Same with 1Gb/s networking. I have 2x80GB disks in RAID0 and I only get 80MB/s sustained write speeds, which is very good for those drives. The average drive only has a 50MB/s write/read figure.


Well, that's what I figured, however I would have thought that two Raptors, spinning at 10,000RPM each, would together have a combined throughput of at least close to 3.0Gb/s. I think they were right when they said that SATA II was a bit ahead of it's time. It seems SSD's can take better advantage of the speed. Anyone else having better data throughput rates with a RAID array?


You're kidding, right? Even solid state drives can't reach those speeds and they have no moving parts!!! You'd be lucky to get 100MB/s (1Gbps) from a single drive, even if its a Raptor. Consumer drives barely hit 50MB/s anyway...

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 PostPost subject: Re: SATA II RAID Controller Issues        Posted: Wed Jan 07, 2009 12:57 am 
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Andy wrote:
4tified wrote:
Andy wrote:
You're lucky to get 170MB/s... You're limited by the disks ability to read/write at such a speed. Just because the controller is 3Gb/s doesn't mean you'll get it. Same with 1Gb/s networking. I have 2x80GB disks in RAID0 and I only get 80MB/s sustained write speeds, which is very good for those drives. The average drive only has a 50MB/s write/read figure.


Well, that's what I figured, however I would have thought that two Raptors, spinning at 10,000RPM each, would together have a combined throughput of at least close to 3.0Gb/s. I think they were right when they said that SATA II was a bit ahead of it's time. It seems SSD's can take better advantage of the speed. Anyone else having better data throughput rates with a RAID array?


You're kidding, right? Even solid state drives can't reach those speeds and they have no moving parts!!! You'd be lucky to get 100MB/s (1Gbps) from a single drive, even if its a Raptor. Consumer drives barely hit 50MB/s anyway...


Well, I guess there isn't an issue then. Thanks.

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Server: PowerEdge 1950 (Gen III) (x1) 2.5Ghz Xeon E5420 / 24GB FB-DDR2 / 1.5tb 7.2k SAS RAID 0
Desktop: Precision T5500 2.66GHz Xeon X5650 / 24GB DDR3 ECC / 2x 300GB Seagate 15k7


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 PostPost subject: Re: SATA II RAID Controller Issues        Posted: Wed Jan 07, 2009 1:08 am 
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Glad I could help. I hope I didn't sound bitter just then, but it was a huge expectation...

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 PostPost subject: Re: SATA II RAID Controller Issues        Posted: Wed Jan 07, 2009 1:17 am 
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Andy wrote:
Glad I could help. I hope I didn't sound bitter just then, but it was a huge expectation...


It's okay, my brain's been stuck in noob-mode since Christmas ;-) Thanks for the help!

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Laptop: Precision M6300 2.4GHz Core 2 T8300 / 4GB RAM / 320GB HD / ATI Quadro FX 3600m
Server: PowerEdge 1950 (Gen III) (x1) 2.5Ghz Xeon E5420 / 24GB FB-DDR2 / 1.5tb 7.2k SAS RAID 0
Desktop: Precision T5500 2.66GHz Xeon X5650 / 24GB DDR3 ECC / 2x 300GB Seagate 15k7


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 PostPost subject: Re: SATA II RAID Controller Issues        Posted: Wed Jan 07, 2009 2:53 pm 
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Your burst speed is more likely to be closer to the physical limits of the drive, about 300mb/s where as the sustained speed is a more accurate representation of what the drive/controler/configuration is capable of, i.e. 170mb/s, which isn't bad. SATAI in RAID0 should be 80-90 sustained and 130-140mb/s burst. You might be able to improve on sustained throughput by adding more drives as 2 is really the bare minimum for any performance increase. I have got as high as 120mb/s (iirc) throughput on SATAI with 3 80gb drives so it is possible.

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 PostPost subject: Re: SATA II RAID Controller Issues        Posted: Thu Jan 08, 2009 12:31 pm 
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OG wrote:
Your burst speed is more likely to be closer to the physical limits of the drive, about 300mb/s where as the sustained speed is a more accurate representation of what the drive/controler/configuration is capable of, i.e. 170mb/s, which isn't bad. SATAI in RAID0 should be 80-90 sustained and 130-140mb/s burst. You might be able to improve on sustained throughput by adding more drives as 2 is really the bare minimum for any performance increase. I have got as high as 120mb/s (iirc) throughput on SATAI with 3 80gb drives so it is possible.


The additional drives would be a great idea, but the Dell case I'm using limits me to 2 drives. eSata is an option, to extend that capacity, but my current RAID card doesn't have any external SATA II ports.

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Laptop: Precision M6300 2.4GHz Core 2 T8300 / 4GB RAM / 320GB HD / ATI Quadro FX 3600m
Server: PowerEdge 1950 (Gen III) (x1) 2.5Ghz Xeon E5420 / 24GB FB-DDR2 / 1.5tb 7.2k SAS RAID 0
Desktop: Precision T5500 2.66GHz Xeon X5650 / 24GB DDR3 ECC / 2x 300GB Seagate 15k7


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