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Slow SATA w/ RAID?


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ok, i just got dual 250 7200RPM WD SATA drives so i hooked them up with my first RAID 0, but I can only seem to get 107MB/s burst and an average of about 64MB/s. this is just higher than what my old ide drive got, i figured raid would double my speed. i think i did something wrong, or is there a bandwidth limitation of some sort? if anybody has some experience with this, please advise, thnx.

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Might be close to 10,000 hits on the internet or at least posts about the Sil3114 and its various rates of write speeds. For sure raid0 due to overhead is never twice as fast as the speed of the same single drive. Raid setup articles and how to's and whatfor's always usually bring that to light.

 

107ish burstish sounds about right depending on stripe/cluster ratio and partition sizes.

 

Looks good to me.

 

 

RGone...

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but I can only seem to get 107MB/s burst and an average of about 64MB/s

 

this is decent for the Si3114.

 

I can pull, when i spend time to really go through and set it all up the long RGone way, about 110MB/s reads and 75MB/s writes. Most average setups will score what yours does.

 

RAID-0 doesnt mean you will double any speed....just means it will read/write faster than a single drive because of how it spans across two drives =)

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That all being said, do you notice an increase in speed and/or response times during general use? Like that heavy-duty program that used to take twice as long to load up?

Sometime the raw numbers don't mean as much in the real-world.

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i found it odd that Max Payne2 would take almost twice as long to load on a Raptor x2 RAID-0...

 

but defragging takes about half the time

 

and photoshop rendering of large files is extremely fast, as is loading of things like Desert Combat, Doom3 levels etc.

 

ripping and then converting music is much faster.

 

but its not like going from a a UDMA66 5400RPM drive to a 15,000RPM Cheetah ULtra-Wide SCSI hehe

 

some stuff is a lot faster

 

most stuff is just noticeably faster

 

some odd things are actually slower...(but this is very rare and only a few programs)

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Agree with Angry.

 

Im getting 116MB/s burst, 93MB/s avg on the 2x 36G raptor raid0.

 

My only ANGER (hehe) is that Newegg just plopped 74G models to $154 each..... grrr. I wasnt gonna get 2x for $195 each, and got the 2x 36G instead, but $154 each, hmmm somebody SLAP the Egg.

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I tested both my Maxtor 120gig ATA and my dual Maxtor 80gig SATA Raid for comparisons, screenshot attached. You can obviously see that the 120 is a little faster in access time, uses less CPU, has a little bit faster burst speed, but has less than half the average read speed.

Surprising that the SATA setup is so much slower than typical expected SATA 150 speeds as per the chart :confused:

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