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post #11 of 19
So basically you can put 24 Drives in Raid0 and have some incredible speeds, like loading windows in 1 second, data transfer rates of 1gabillionGB/s
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post #12 of 19
Quote:
Originally Posted by Znth View Post
So basically you can put 24 Drives in Raid0 and have some incredible speeds, like loading windows in 1 second, data transfer rates of 1gabillionGB/s

lol
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post #13 of 19
Quote:
Originally Posted by Znth View Post
So basically you can put 24 Drives in Raid0 and have some incredible speeds, like loading windows in 1 second, data transfer rates of 1gabillionGB/s
No.

And RAID0+1 has a slight increase in Read Speeds sometimes.
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post #14 of 19
Quote:
Originally Posted by gonX View Post
All dependant on controller. Minimum is 2 and it's not worth it when you go above 4 drives.
+1

Quote:
Originally Posted by That_guy3 View Post
How many drives can I have in RAID 0?
In an article at Tom's Hardware they tested an add-on RAID SATA card, which is anyhow a lot better than on board raid. They have found that 5 disks was the sweet spot, anything above was keeping the speed leveled.

Things to consider: a modern HDD has a sustained transfer rate above 60MB/s. On board SATA controllers are connected inside the southbridge with the I/O bus through a 1x PCIe lane (at best, some older are connected on PCI). A PCIe 1x gives 250MB/s, PCI only 133MB/s in theory . In practice PCIe 1x goes 225MB/s, while the PCI goes 115MB/s on average.

If a HDD can sustain 65MB/s , 4 of them will be at the limit of the PCIe interface (260MB/s). That's why GonX and others have said that the limit is 4 HDDs.

More powerful server-level RAID controllers can be connected on PCIe 4x slot (rare on mobos these days) for a max of 1GB/s which obviously allows more HDDs to be added up to the raid 0 matrix.

If a HDD from the RAID 0 fails, the data is lost. RAID 5 allows a bit of redundancy - one drive can fail, and the data is not lost, but the matrix works at very low speed until the fulty disk is replaced. RAID 5 supposes that one disk is kept for redundancy, so if you put 4 disks you'll be able to use the data from only 3 of them. RAID 5 adds also a massive CPU overhead, on-board controllers can handle it, but it's better to pass.

Hope it clears up some stuff, cheers!
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post #15 of 19
Quote:
Originally Posted by OCZedd View Post
No.

And RAID0+1 has a slight increase in Read Speeds sometimes.
Well duh

But nobody was clearing it up, so I thought I'd be the one to say it.
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post #16 of 19
Quote:
Originally Posted by Znth View Post
So basically you can put 24 Drives in Raid0 and have some incredible speeds, like loading windows in 1 second, data transfer rates of 1gabillionGB/s

Sure of course, but if one of those drives go bad you lose your data on all 24 harddrives. Thats why its not really recommended to use more than 4 HDs in RAID0 because of the much higher chance of complete data lose.
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post #17 of 19
Quote:
Originally Posted by sccr64472 View Post
Not true. The data has to be written to both simultaneously and does affect performance.
My original statement was CORRECT.

Since there are no parity calculations involved, there won't be any performance decrease with RAID 1, it just writes the same data to two different drives.

RAID 1 will, however, INCREASE read speeds because two different drives can read the same data at the same time.

So, RAID 10 (with 4 drives) would actually be faster than RAID 0 (with 2 drives)

...please do some research before you tell me I am wrong.
Thank you!

Source

Quote:
Originally Posted by wikipedia
When writing, the array performs like a single disk, as all mirrors must be written with the data.

the read performance can go up roughly as a linear multiple of the number of copies. That is, a RAID 1 array of two drives can be reading in two different places at the same time
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post #18 of 19
Quote:
Originally Posted by bruestle2 View Post
My original statement was CORRECT.

Since there are no parity calculations involved, there won't be any performance decrease with RAID 1, it just writes the same data to two
different drives.
Your onboard raid controller requires the cpu for all of the calculations for the entire array. Were you under the assumption that your cpu wasn't bothered? If you look at the performance impact of running a Raid10 configuration, you'll see that it takes away a lot of cpu cycles. I have no idea why you mentioned parity, since neither Raid 0 nor Raid 1 involve parity.

Quote:
Originally Posted by bruestle2 View Post
RAID 1 will, however, INCREASE read speeds because two different drives can read the same data at the same time.

So, RAID 10 (with 4 drives) would actually be faster than RAID 0 (with 2 drives)

...please do some research before you tell me I am wrong.
Thank you!
Break this down and I'm sure you'll see the error in your logic. Your first sentence is taken out of context. Raid 1 has a read speed advantage over a single drive. It offers no advantage (performance wise) over Raid 0. This also holds true when comparing a Raid 10 array versus a Raid 0 array. In a fantasy world, Raid 10 would have equal performance to Raid 0, but because the cpu is required for all calculations, there is a large performance hit.
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post #19 of 19
there should be very few calculations (b/c no parity), so if you use hardware RAID why would RAID 1 slow it down at all?


(I think our problem is that we are talking about two different things...you are talking about onboard RAID and I am talking bout a RAID card)
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