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Thread: Raid 0 across 4 HDD




  1. #31
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    Default Re: Raid 0 across 4 HDD

    I like that idea but... my game files alone would devour those SSD drives... As far as that capacity goes it would fit maybe 4 games... on the 64GB and 8 -10 on the 128GB... See... I have about 37 games last I checked loaded onto my computer so SSD would be GREAT if they just had a lot more memory and since I would be using a SSD to read from for gaming and I could use a raid SAS build for editing and rendering it would not be a bad option but the amount of SSD drives that I would need (about 5 at this point) would be way out of the reasonable cost range.

    We are talking about 600-800 dollars just for 256GB of storage or around 200-300 for 128GB of storage so as far as cost effective goes 200 x 4 = 800 so not so bad but then your SAS drives at 200 x 2 + 400 RAID card same cost more space and slightly slower speed the speeds he posted from his disks was amazingly fast

  2. #32
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    Default Re: Raid 0 across 4 HDD

    Check out your forum on all the issues with SSD. I talked with LSI Logic about using SSD drives. I have read many reviews on them from other forums and talked with engineers. SSD degrade in performance faster than SAS. Seagate has not released SSD drives. They are the leader in hard drive technology. As an EE, they degrade in months and the write performance drops off faster on SSD. At least with SAS, you can defrag them in a few hours. The refresh software can cause problems.

    Kingston V+ are the best SSD drives on the market for performance. They are 2x the cost of SAS. 171 MB/s to 110 MB/s for 15K.6 drives. They are 1/2 the cost of SSD and 25% slower. Put a SAS RAID cached RAID controller with them, you get 3-4x the performance of SSD. I rather have the 8708EM2 handling my RAID than Microsoft and my CPU/RAM. the new 15K.7 300 GB drives are

    Internal data rate 1.49 - 2.37Gbits/sec (max)
    186 MB/s to 309 MB/s maximum performance.

    At $180 for 146GB SAS 15K.6, why go used? Get new and enjoy the warranty and support for 5 years.

  3. #33
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    Default Re: Raid 0 across 4 HDD

    Most users get a 30% fall off in performance within 2-3 months on SSD. The new 15K.7 drives are faster than SSD and more reliable. They don't loss performance.

    300GB 15K.7 was around $381.
    Internal data rate 1.49 - 2.37Gbits/sec (max)
    186 MB/s to 309 MB/s maximum performance.

    Kingston V+ 128MB SSD is $349, this is one of the fastest and more reliable on the market. 180 MB/s Read and Write.

    A SAS RAID cached controller should take the drives to 1.8GB/s cached reads are 1.2 GB/s cached writes in RAID 1.

    I am going to put a pair of them on my 8708EM2. LSI Logic said I should have no problems with 3 RAID 1 pairs on it. It should not max out the controller or PCIe channel with one user.

    My current 10K.2 on it are 1.01 GB/s cached reads and 680 MB/s cached writes. His SSD are 180 MB/s and 110 MB/s. In 2-3 months maybe 120 and 80 after the degrade. SAS does not degrade. Even, if you don't defrag them. These are server drives. Servers don't get defragged that often.

  4. #34
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    Default Re: Raid 0 across 4 HDD

    Concidering that I am trying to go from 60MB/s sequential read to something around 1.49-2.37GB/s I mean... I can not argue with that. It is such a high jump that I know I will see the difference I have a little clock on my monitor that tells me my drive usage and it tells me all the time every time I open something up that I am maxing out the speed on the drive just trying to open a program like Firefox and it takes a little to load as well... That should not happen but its because it can not read it fast enough obviously so I think my best option is exactly what you said to get that 15k.7 300GB and RAID 2 of them together and put my gaming apps and visual rendering programs on those and then get a smaller SAS drive for my OS and use the 1TB that I have now as media and storage.

    Personally that sounds like the best idea to do with technology right now.

  5. #35
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    Default Re: Raid 0 across 4 HDD

    60 MB/s is 480 Mbit/s. 60 MB/s is probably not your average.

    1.49 - 2.37 Gbits /s: 1490 - 2370 Mbit/s

    3x-5x natively. On a SAS RAID cached controller it will be 10x+.

  6. #36
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    Default Re: Raid 0 across 4 HDD

    This is what it should be....

    http://www.samsung.com/global/busine...&model_cd=249#

    and what it is well... it is not that... that is for damn sure... it is much much slower
    Last edited by Malion; 11-12-2009 at 06:16 AM.

  7. #37
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    Default Re: Raid 0 across 4 HDD

    I can not use these RAID controllers... the require a x8 PCI-E slot and I have 2x PCI-E x16 and 1x PCI-E x4... The 2 16's are taken by 2 video cards... I do not believe I can plug in those raid controllers...

    All these slots are concidered PCI-E x16 2.0 slots until 2 slots are taken up then it reduces the 3rd to x4...
    Last edited by Malion; 11-12-2009 at 06:54 AM.

  8. #38
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    Default Re: Raid 0 across 4 HDD

    PCIe x4
    MegaRAID 8208ELP SAS/SATA RAID

    PCIe x4 or x8
    MegaRAID 8704ELP SAS/SATA RAID with 128MB DDR2 667 Cache.
    8 drives
    optional battery to improve write cache

    MegaRAID 8708ELP SAS/SATA RAID with 128MB DDR2 667 Cache.
    RAID 1 up to 32 drives
    optional battery to improve write cache

    x4 would be fine for up to 8 drives.

    What is in the other two slots? Can they be moved?

  9. #39
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    Default Re: Raid 0 across 4 HDD

    In the other two PCI-E x16's there are 2x PCI-E x16 Asus Radeon HD 4890's no they can not be moved to any other slots not only that but they are massive so I will barely be able to squeeze in a raid controller as is >.>

  10. #40
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    Default Re: Raid 0 across 4 HDD

    4890s are massive. I have a 4850x2 and its fine for gaming and CAD.

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