internal RAID using SATA3 HDD

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metaclay

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Sep 19, 2017
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I want to setup internal RAID using SATA3 drives. couple of questions :

1. If the motherboard already has raid support , do i still need to buy PCIe sata raid controller ?
2. As far as i know the Sata3 interface can deliver around 750MB/s+ , so how fast this raid-0 can go up ? and how many strip(disk) to achieve the optimum result? (most motherboard nowadays have 6 - 8 sata ports )
3. Any suggestion for taking control the heat inside the PC case ?


 
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1. No, you don't need to buy anything else. The RAID support included in the BIOS on you mobo will do the job for you. An added dedicated RAID card, IF it is the right type and expensive, can do the RAID job just a little faster, but you really do not need that.

2. The real data throughput rate of a RAID array consisting of mechanical hard drives (ones with moving disks and heads, NOT one with only SSD units) is limited by the speed of the drives themselves - particularly, the rotational speed and the head movement speed. Typically the fastest HDD's can deliver more than the original SATA specs, but not more that the second-generation SATA 3.0 Gb/s specs. So you'll never see 750 MB/s. This is by design. The SATA 6.0 Gb/s interface was...
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Paperdoc

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1. No, you don't need to buy anything else. The RAID support included in the BIOS on you mobo will do the job for you. An added dedicated RAID card, IF it is the right type and expensive, can do the RAID job just a little faster, but you really do not need that.

2. The real data throughput rate of a RAID array consisting of mechanical hard drives (ones with moving disks and heads, NOT one with only SSD units) is limited by the speed of the drives themselves - particularly, the rotational speed and the head movement speed. Typically the fastest HDD's can deliver more than the original SATA specs, but not more that the second-generation SATA 3.0 Gb/s specs. So you'll never see 750 MB/s. This is by design. The SATA 6.0 Gb/s interface was designed deliberately to be able to communicate with other components (like the HDD controller ship on your mobo) faster than any device that might be used with this communications sub-system. That way the sub-system will never be the speed limiter. The limit will be from the attached device, not the communications subsystem. Today even the fastest SSD units cannot handle data faster than the 6.0 Gb/s communications subsystem.
 
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