Raid Speed Question

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TwistedFury

TwistedFury

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I have 1 hard drive that says it has 3GB/s speeds, and I raid 0'd it with a laptop drive that doesn't have it, and my hard drive doesn't even reach speeds close to that, if I un-raid it, will I get the 3gb/s speed I am supposed to get? My motherboard supports it, but is gb/s just a gimmick?
 
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DonQuixoteMC


Maybe. You would have to link the SSD. If its read-write speeds aren't over 300MB/s, then no.
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DonQuixoteMC

DonQuixoteMC

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I think it must be referring to the SATA II connector. There's no hard drive that can even come close to those speeds.

http://en.wikipedia.org/wiki/Serial_ATA#SATA_revision_2.0_-_3_Gbit.2Fs_-_300_MB.2Fs
 
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Tom Tancredi

Tom Tancredi

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RAID only really comes into play when using MULTIPLE drives, normally minimum of 3. That is when you truly get the benefits of speed and redundancy, as well as 'hot swapable' performance, that while doing stuff you can 'replace' a drive without ever turning off the computer or losing data. RAID for the consumer is not needed.

That said, as noted, your speeds are because your CONTROLLER chips inside the laptop are ONLY SATA II, a very old standard. Currently we all use SATA III, which if you read the link is twice that bandwidth but still wont' make the "drive faster". The drive's "speed" is based solely on how it was made. A 5400RPM (how fast the discs spin) will be much slower performance then a 7200RPM, and both considerably slower then a SSD (RAM based storage). But none of that will matter if they are connected to a 'bottlenecked' controller chipset (SATA II) they would all 'cap' at 3Gb/s.
 
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DonQuixoteMC

DonQuixoteMC

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Exactly. Most HDDs peak at around 100 MB/s transfer speeds.

Think of the 3 Gb/s SATA II connector as a pipe. It's big enough to allow 300 Gb/s of data through at once, but your HDD (the pump) can only output 100 MB/s of data. That roughly fills the pipe a 3rd of the way.

That's how your SATA II connector and HDD interact. The SATA II is just a pathway for the HDD's data.
 
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F

FireWire2

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If you need speed than use SSD, RAID0 wont help the random read/write - real life aaplication

Note: 3Gb/6Gb/10Gb when ref as bus speed. this does not mean your device can run at that speed. It's only mean compatible

 
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DonQuixoteMC

DonQuixoteMC

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The thing is, unless you have an SSD, you won't be able to reach transfer speeds anywhere near 300 MB/s. So I don't think it will matter.

You could think about using a RAMdisk, but that can be impractical depending on the application and the amount of RAM you have.
 
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DonQuixoteMC

DonQuixoteMC

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Maybe. You would have to link the SSD. If its read-write speeds aren't over 300MB/s, then no.
 
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