need advice for raid !

Discussion in 'Mac Pro' started by AjeeB, Oct 26, 2011.

  1. AjeeB macrumors member

    Mar 29, 2010
    I have macpro 2008 , with 3.5TB ! 3 HDD 500GB ,and 2TB segate 1 disk
    and I don't have hardware raid card ...
    is there any different between raid and basic !!! in performance ?
    can I combine all in RAID ! or even do I need hardware raid at all

    p.s. I also run bootcamp sometimes

  2. derbothaus macrumors 601


    Jul 17, 2010
    There is a difference between SW and HW RAID's, yes. HW RAID's are usually faster and slightly more stable if you get a good card and driver.
  3. JavaTheHut macrumors 6502


    Aug 15, 2010
    I believe your asking what the Speed gains will be, so basic being straight HDD usage non raid. Yes performance goes up BUT you need to back up your data for the day when it fails and it will fail one day.

    Heres a little light reading

    derbothaus is right about the stability of the Hardware raid being the preferred method, but you can certainly run a software raid to get some speed gains using what you have at hand, but you should state what HDD's you are using for the people here to understand what you will try to configure so they can help you better.

    I run 3x2TB HDD with SW raid and get pretty good speed and Back that array up with Carbon Copy Cloner to another 3TB HDD
  4. Knollwood7E macrumors newbie

    Apr 28, 2011
    Need Advice For Raid

    Bootcamp does NOT support RAID. You can find more information at the Apple support site.
  5. nanofrog macrumors G4

    May 6, 2008
    Yes, there are differences between software and hardware RAID implementations.

    Software RAID is a low cost solution, which means there are compromises. To keep the costs low, it uses system resources to run the calculations (located in software drivers). Besides using system resources (typically isn't much for 0/1/10, which is all Disk Utility is capable of), but you won't be able to do things like Online Expansion or Online Migration (ability to add capacity or change the RAID level without the loss of data already on the drives). This means that if you want to change levels, you have to backup the data, change the RAID configuration (initialization process = wipes all data), the restore the data. So there's a lot more direct user interaction required.

    Also, because most software RAID systems use consumer disks, they're not as reliable, nor does the system provide much in the way of recovery (additional features found on hardware RAID cards).​

    Hardware RAID is more expensive, but the performance is better (particularly as you add disks, and/or can run levels not possible in software <5/6/50/60>, or shouldn't be done in software, such as RAID 5), as well as the features (Online Expansion, Online Migration, additional volume recovery features, enclosure communications, ..., depending on the model; some can be attached to a network for remote access and NTP Server access).

    It should also be noted, that hardware RAID cards require the use of enterprise grade HDD's, which are more reliable, but also more expensive (different recovery timings in the disk's firmware, additional sensors that prevent the heads from smacking the platters, and typically better platters themselves <1E15 bit error rate, vs. 1E14 bit error rate which is common for consumer grade disks>).​

    Important Notes:
    1. Regardless of your storage system (single disk to the most redundant RAID system ever created), you must have a proper backup solution in place.
    2. I would recommend you read the following Wiki pages:
    3. As mentioned, Bootcamp does not support RAID volumes (software or hardware). So you'll need to use a separate disk for Windows (won't need to run Bootcamp, just the setup.exe file on the disk in order to install the necessary drivers for your MP).​

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