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Thread: Raid 0 question

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    Default Raid 0 question

    Hey guys I already have a Western Digital Caviar Black 640GB (WD6401AALS) Im wondering if I went and picked up the 1TB version (WD1001FALS) would I be able to put that with the 640GB in raid 0 and still get the same speeds or atleast decent speeds as if I had two 640GB drives together?

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    If you want speed from a Raid 0 array you want to use 4, 5 or even 6 drives. You want the drives to be small in size also to get the best speed.

    The way the total size of the Raid array is callculated is by multiplying the number of drives being used in the array by the smallest volume drive being used in the array.

    If using 4 60 GB drives that would give you 4X60 which is 240 GB.

    If using 2 500 GB, 2 120GB and 1 80GB drive it would have a total size of 5X80 which = 400GB and so on...

    Using 2 very large drives in a Raid 0 array is a waste of the hard drive space and the speed increase will not be very much...

  3. The following user thanks 4hams For this above post:

    smduff (31-10-2009)

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    cool thanks for the reply's. The reason I ask is I plan on getting another 640GB drive but I also got the in store product replacement plan so if it stops working for any reason within 4 years they said the 640GB wont be around for much longer and they will just replace it with the 1TB version. I guess if that happens I would be using the 1TB for storage.

    Also how do I set up Raid0? I have no idea about this.

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    I was reading reviews on newegg saying the 640 drives were much faster than the 500GB ones but again this is something I know very little about

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    yes both are 7200

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    To anwser your question about raid0; you need two identical drive to do raid0.
    If you mix match them, you just hurting it's performance and asking for trouble.
    Raid0 is for performance, and other array raid are more for safety backup, example raid1.
    Keep this in mind the more drive you use the more power it requires, the more noise and heat they generate.

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    Quote Originally Posted by Deton View Post
    To anwser your question about raid0; you need two identical drive to do raid0.
    If you mix match them, you just hurting it's performance and asking for trouble.
    Raid0 is for performance, and other array raid are more for safety backup, example raid1.
    Keep this in mind the more drive you use the more power it requires, the more noise and heat they generate.
    Deton, it is recomended to use identical drives but it is not necessary. Using identical drives only gives you the best use of the volumes of the drives being used.

    Remember Raid 0 uses the number of physical drives being used multiplied by the drive with the smallest volume to give you the overall volume of the Raid.

    So if using 3 1 TB drives and 2 60 GB drives the total size of the array's volume will only be 300 GB which means a huge loss in actual volume or storage space.

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    Actually, turn it into a Velociraptor:

    http://www.techwarelabs.com/seagate_1-5tb-mod/

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    Quote Originally Posted by 4hams View Post
    If you want speed from a Raid 0 array you want to use 4, 5 or even 6 drives. You want the drives to be small in size also to get the best speed.
    Quote Originally Posted by 4hams View Post
    Using 2 very large drives in a Raid 0 array is a waste of the hard drive space and the speed increase will not be very much...
    There's a subtlety you're missing with that statement. Ultimately, for any given "size" of the array, having more drives to make that "size" is generally faster than having fewer drives. What I mean is that 4 500 GB drives in Raid 0 will tend to be faster than 2 1000 GB drives in Raid 0, assuming that the individual speeds of the 500 Gig drive and the 1000 gig drive are the same.

    It's nothing inherent in the large drives that makes them slower than the smaller drives in Raid 0, it's just that you tend to use fewer of them (all other things being equal). 4 giant harddrives in Raid 0 is going to be just about as fast as 4 smaller harddrives in Raid 0...

    That being said, Raid 0 with 2 drives doesn't really buy you all that much performance improvement over a single drive, at least not in "real world" scenarios (benchmarks are a different matter). I'd estimate that you're buying about a 10% (in ideal circumstances) increase in performance outside of benchmarks. Adding 2 additional drives may give you another 10% increase in performance outside of benchmarks (again, under the right circumstances). Your likelihood of a failure goes up, however, to nearly the sum of the number of additional drives in the array (the actual formula is essentially 1-(1-p)^n where "p" is the probability of a drive failing, and "n" is the number of drives in your Raid 0 array). For 2 drives, that's 2p-p^2 (slightly less than double the likelihood of one drive failing). For 4 drives, that's 4p-6p^2+4p^3-p^4, again less than 4 times the likelihood of a single drive failing. To put some numbers to that, if you build an array of identical drives, and each drive has a 1% chance to fail in some amount of time, then an array built out of 4 of those drives in Raid 0 has a 3.9% chance of failing over that same time period. An 8 disk array has a 7.7% chance of failing over that same time period.

    That shouldn't sound too scary, however, as drives are relatively reliable for users in a non-server environment. It's not until you have tens of drives that you have to seriously consider failure rates.

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    I think we've throw too info at him, it must be over his head.

    I'm sure you can mix match the drive size but IMO I would perfer they have the same RPM and cache size. I would want to pair one 8mb @5000rpm with 16mb or 32mb @7200rpm. Hey we're doing RAID0. Raid0 is for performance setup and IMO if you have mix match drive then why bother doing RAID0, I think it will hurt the performances more than speed up.

    Regarding to the article; converting Seagate to velocity raptor, damn a 7200rpm drive can beat 10000rpm drive?
    Poor WD is losing the sales on Raptor.

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    Quote Originally Posted by 10pmStalker View Post
    Hey guys I already have a Western Digital Caviar Black 640GB (WD6401AALS) Im wondering if I went and picked up the 1TB version (WD1001FALS) would I be able to put that with the 640GB in raid 0 and still get the same speeds or atleast decent speeds as if I had two 640GB drives together?
    So to answer the question, the Raid 0 array will essentially look like the minimum of all specs of each disk in the array. So if you have a fast drive and a slow drive of the same capacity, the array will essentially perform the same as an array of 2 of the slower drives. If you have a large drive and a small drive, the array will have double the capacity of the smaller disk.

    So, there's no reason why it shouldn't work that I can think of, keeping in mind the above "limitation".

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    Quote Originally Posted by Deton View Post
    Regarding to the article; converting Seagate to velocity raptor, damn a 7200rpm drive can beat 10000rpm drive?
    Poor WD is losing the sales on Raptor.
    I suppose it makes sense, however. The 10k RPM Raptor's are really only 2.5" drives, whereas the 7200 RPM drives are 3.5" drives. 10k operating at a "linear" distance of 1.25" from the spindle gives an overall linear speed of around 12500 inches per minute, or 208 inches per second. The 7200 RPM drive at 1.75" from spindle is an overall linear speed of around 12600 inches per minute, or 210 inches per second. Carving out only the last 300 gig's of a 1.5 TB drive is 1/5th of the capacity. Given that the areal density is variable on the drive, it seems to me that you could get serious performance out of the drive. However, the areal density of those 1.5 TB drives is also a lot higher than the Raptors, so you're getting more bits flying by per rotation than the 10k drives. You're only giving up some seek time averages (aka the time it takes to wait for a full rotation to get the next piece of data).

    Sounds plausible to me. However, I wonder what the "reliability" of those drives will be over time - you're constantly hitting that same 300 gigs all the time on a drive that may or may not be designed to have that part of the drive continually accessed, rather than a smattering of space over the rest of the drive.

    BTW, this is getting REALLY off topic...

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    ^^^ Math whiz.


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