SSD in RAID 0

[dragoncurt]

I know SSD can be in raid 0 and how raid 0 works but if the interface is sata 3 @ 6Gb/s then how do you get past that limit of 6Gb/s. Is it because of raid 0 makes the drives as one. Then make each run at the maximum speed and add that together to make something like 1.2 GB/s Instead.

 

Just wondering.

 

Thanks

[Altecice]

Because SATA is a Serial connection (Serial-ATA). This means that when you have your SSD's in RAID0 it will read/write to one drive (so one port) and then the other. Allowing the array to use the bandwidth of both ports.

[2FA]

Two SSDs in RAID 0 will not be enough to be bottlenecked by SATA 3.

[Enderman]

each SSD is connected by its own sata cable

you do not connect one SSD to the other

[dragoncurt]

each SSD is connected by its own sata cable

you do not connect one SSD to the other

Oh I know that but how does it go faster than sata 3 is it because it shares the files out as if it was one SSD drive but it used say 3 sata 3 ports to share the files out randomly and does that then make the speeds technically faster than sata 3.

[Enderman]

Oh I know that but how does it go faster than sata 3 is it because it shares the files out as if it was one SSD drive but it used say 3 sata 3 ports to share the files out randomly and does that then make the speeds technically faster than sata 3.

[m_tieu]

For my SSD's in RAID0 I only get just under 1 GB/s reads and writes. This is because the data is striped onto both drives so the computer reads and writes to both simultaneously so it is almost twice as fast as one drive.

[Captain_WD]

~snip~

 

Hey there dragoncurt,

 

Here's more info on this: RAID0 offers a good boost to the sequential read/write speeds but has little effect on the random ones. Most everyday activities on your computer rely more on the random read/write speeds so you won't notice a huge boost in the performance of your computer. What the RAID does is it writes simultaneously to all drives in the array and you can roughly get the total speed by taking the slower speed of all drives in the array, multiply it by the number of drives and then multiply that number by roughly 85% (depending on the controller). This way if you have two SSDs that work with 550MB/s each you would end up with a RAID0 that works at speeds of roughly 930MB/s. SATAIII (6Gb/s) has a limit of 600MB/s (after the encoding overhead is taken into account) but this is per connection. The two SSDs in the array each have its own connection and your speed cap will be roughly 1200MB/s or 1.2GB/s.

 

Captain_WD.

[dragoncurt]

Hey there dragoncurt,

 

Here's more info on this: RAID0 offers a good boost to the sequential read/write speeds but has little effect on the random ones. Most everyday activities on your computer rely more on the random read/write speeds so you won't notice a huge boost in the performance of your computer. What the RAID does is it writes simultaneously to all drives in the array and you can roughly get the total speed by taking the slower speed of all drives in the array, multiply it by the number of drives and then multiply that number by roughly 85% (depending on the controller). This way if you have two SSDs that work with 550MB/s each you would end up with a RAID0 that works at speeds of roughly 930MB/s. SATAIII (6Gb/s) has a limit of 600MB/s (after the encoding overhead is taken into account) but this is per connection. The two SSDs in the array each have its own connection and your speed cap will be roughly 1200MB/s or 1.2GB/s.

 

Captain_WD.

Thanks for putting it the way you did. Thanks helped me a lot.