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INFO: Esential RAID and HD knowledge

post #1 of 25
Thread Starter 
Everybody working with RAID, or considering to doo so, should read this. As should people with Q's regarding SATA disk performance.

In this treat you will primarily find reviews and comment about testing and comparing SATA disk's in single disk and 2x, 3x and 4x Raid-0 arrays with similar Raptor setups. You will also find comments on how these disk's and arrays perform outside the testing arrena.

The testing I have done is inspired off, and backed by this review:http://www.hothardware.com//viewarti...?articleid=745

A writeup of all the testing will be compiled here shortly, but read on, it's there!!
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post #2 of 25
I assume you meant the I-Ram article, very interesting. Alas, right now some thing like that really deasn't help much. I think it would make for a kick butt page file...especially in a server (like adding another 2-4 gigs of slow ram to your existing ram). Now if they could make the DIMMs built in (like a graphics card) and make it DDR3 in a four gig size...now we are talking. But also talking several thousand dollars...

I amy buy one of these some day when they get cheaper...as i would just fill it with old 512 sticks, $150 for a two gig hard drive isn't worth it...even if it is a fast hard drive.

And a fast RAID-0 is no that far behind it in most of the tests and benches
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post #3 of 25
Thread Starter 
My bad, link corrected.

No I didn't mean the I-ram article, though it is interesting. Not as fast as you would think though. Perhaps you could Raid-0 two of them:-)

It is a comparisontest of different raid setups like 3xraid-0 vs raptors etc. It explains a lot about stripsize too, and the importance of these. How much to gain if putting in a third raid-0 disc, compared to just two.

Lots of good info!

Basicly it also concludes, that the raptors are very good drives, that just happened to get the s*** kicked out of them by a cheaper, younger, better and bigger system. Only point the raptors are ahead on, is seektime. And honestly ... on a defragmented system, the difference of 8.6 ms is not that big a deal. I would perfer the way higher transferrates any day.

The thing that hits me with this article is, that for the price of ONE (1) Raptor 74gb, you could have FOUR (4) 80gb Dmax10's, or other small discs. Wich acording to the test, would be somewhat the meanest setup I can imagine. Well 4 Raptors would be nicer, but at that price, that's not really an option for me.

I can let you know how it comes to work. I just got two Dmax10's as raid-0, and I'm ordering 2 more. It's so cheap I got to try it :-)
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post #4 of 25
This is really good
post #5 of 25
Thread Starter 
The third disc arrived today. I only ordered one to start with, since I wanted to see if my controler could utilise it, before buying a fourth.

I made a Test in Sisoft Sandra, on a fresh XP install, with all my drivers and programs running in the back, and netradio on. That in mind, better scores might be posible, but these shows what the tree discs can muster in normal use invironments.

SiSoftware Sandra

Benchmark Results
Drive Index : 145MB/s

Performance Test Status
Run ID : 3xRaid-0, 3x80Gb Maxtor DiamondMax10, on 12. april 2006 at 14:26:37

Benchmark Breakdown
Buffered Read : 226 MB/s
Sequential Read : 193 MB/s
Random Read : 67 MB/s
Buffered Write : 421 MB/s
Sequential Write : 191 MB/s
Random Write : 100 MB/s
Average Access Time : 10 ms

These results were only matched by a 4xraid-0 with 4x36Gb Raptors. wich is my version of sandras reference system. They scored a drive index of 144!!

I think the relatively low Random Read score is due to all the background activity on the system.

A boot on a fresh windows install is app. 15sec. before intalling programs etc.

I guess I better order that fourth disc
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post #6 of 25
Quote:
Originally Posted by Skipper
The third disc arrived today. I only ordered one to start with, since I wanted to see if my controler could utilise it, before buying a fourth.

I made a Test in Sisoft Sandra, on a fresh XP install, with all my drivers and programs running in the back, and netradio on. That in mind, better scores might be posible, but these shows what the tree discs can muster in normal use invironments.

SiSoftware Sandra

Benchmark Results
Drive Index : 138MB/s

Performance Test Status
Run ID : 3xRaid-0, 3x80Gb Maxtor DiamondMax10, on 5. april 2006 at 21:55:52

Benchmark Breakdown
Buffered Read : 218 MB/s
Sequential Read : 186 MB/s
Random Read : 62 MB/s
Buffered Write : 442 MB/s
Sequential Write : 183 MB/s
Random Write : 92 MB/s
Average Access Time : 11 ms

These results were only toped by a 4xraid-0 with 4x36Gb Raptors. wich is my version of sandras reference system. They scored a drive index of 144!!

I think the relatively low Random Read score is due to all the background activity on the system.

A boot on a fresh windows install is app. 15sec. before intalling programs etc.

I guess I better order that fourth disc
Have you tried loading a game? See how long it takes to load a level.
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post #7 of 25
Thread Starter 
Sorry to chock you.......I don't game

But I can however tell you that when it comes to opening programs, rendering 3D, and basicly any HD intensive use, things just happens a good deal faster than before

On aplications where HD speed is the key factor, things happen so much faster than I would ever have hoped for. Just such a thing like wating for Norton to finish loading and all that. It dosn't merrit a coffybreak any longer

Now I just hope the discs will stay in good condition. Real men don't do backups! They just cry a lot

Just to confirm the results, I did some further testing.

HD Tach:
Burst: 447.1Mb/s
Average Read: 183.6Mb/s
Random Access Time: 13.9ms

ATTO:
Sustained Write transfer rate: 188.692Mb/s
Sustained Read transfer rate: 184.549Mb/s

I think I have reason to be happy

Next up will be a test of a single drive, then a 2xraid-0, and finally a 4xRaid-0. That should provide for some good referencedata for future "raiders"
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post #8 of 25
totally sick burst times....I want to do that....and I have 4 SATA ports unused on my new ECS build...
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post #9 of 25
Thread Starter 
The really sick part of it is, that this hasn't cost me more than 3/4 of a 74Gb Raptor so far
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post #10 of 25
Thread Starter 
Today the fourth disc arrived.

I have started out by testing it as a single boot disk, with the same OS etc. as the raid setup. That means that this is again under normal use conditions.

The results speak for them selves:

SiSoftware Sandra

Benchmark Results
Drive Index : 55MB/s

Performance Test Status
Run ID : 80Gb Maxtor DiamondMax10, on 7. april 2006 at 15:37:16

Benchmark Breakdown
Buffered Read : 184 MB/s
Sequential Read : 66 MB/s
Random Read : 39 MB/s
Buffered Write : 155 MB/s
Sequential Write : 65 MB/s
Random Write : 44 MB/s
Average Access Time : 11 ms

HD Tach:
Burst: 211Mb/s
Average Read: 60.4Mb/s
Random Access Time: 14ms

ATTO:
Sustained Write transfer rate: 60.594Mb/s
Sustained Read transfer rate: 60.187Mb/s

When looking at HD Tach, with a 74Gb Raptor on as reference, the discs are almost on top of each other. The Rapor is slightly on top, and has a more constant flow.

My impresion of the disc is, that it performs very well. Compared with my 120Gb Hitachi Deskstar......well there realy is no comparison. The Dmax is way more quiet, much colder running, and really notisably faster in ever way. Between the two, the Dmax made it a new PC.

What can I say. I'm still happy

So now I will set up a 2xRaid. Results will follow
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