RAID0: Black Vs RE4 in a consumer grade RAID?

Discussion in 'Mac Pro' started by Loa, Jun 27, 2011.

  1. Loa macrumors 65816

    Loa

    Joined:
    May 5, 2003
    Location:
    Québec
    #1
    Hello,

    WD's own page specifies that the SATA III Caviar Black is recommended for consumer type RAID (which is what I need it for).

    Since I'm using my computer as a power user, would going to a RE4 set-up be a significant advantage over Blacks?

    Thanks

    Loa
     
  2. CaptainChunk macrumors 68020

    CaptainChunk

    Joined:
    Apr 16, 2008
    Location:
    Phoenix, AZ
    #2
    Someone like nanofrog would be able to elaborate more on RAID setups. But the way I understand it, the RE4s would be recommended for use with hardware RAID systems (i.e. the disks are attached to dedicated hardware raid controller cards like Areca/Atto).

    For software RAID (a RAID system set up in OS X), the Caviar Blacks should be fine.
     
  3. Hellhammer Moderator

    Hellhammer

    Staff Member

    Joined:
    Dec 10, 2008
    Location:
    Finland
    #3
    This is my understanding as well. Of course, RE4s should be more reliable since they are enterprise level but HDs are always tricky and unreliable.
     
  4. nanofrog macrumors G4

    Joined:
    May 6, 2008
    #4
    What controller will they be attached to?

    The answer to this may mean that consumer models are not viable, due to stability issues (why RE editions are used on hardware RAID controllers, as the recovery methodologies are different from the ICH on the logic board - OS controlled when disks are on the ICH, but the card takes over this function if used).

    Now you can use RE models on an ICH without issue, and in theory, they're more reliable. But if you dig a bit deeper (i.e. take it apart and research the components used to make it), all that separates the RE versions from their consumer counterparts, is some added sensors and different firmware (mechanics are the same; platters, servos, and spindle motors). Keep in mind, I'm limiting this to WD products you're considering...

    These days, the sensors are the only thing that would make any difference, and for say 4x disks, it likely won't matter (not a high vibration environment).

    So if you're running them on the ICH, I'd use consumer models due to cost reasons (just make sure your backup system is up to snuff for what you're doing). Warranty is no different in this case (5 years either way).

    Correct.

    Enterprise level may matter with some brands (cherry picked platters with other makes for enterprise vs. consumer; warranty period may differ as well, as a lot of consumer disks have been reduced to 3 years), but not so much with WD's in terms of the disks themselves (see above).
     
  5. Loa thread starter macrumors 65816

    Loa

    Joined:
    May 5, 2003
    Location:
    Québec
    #5
    Hello,

    Thanks for the info. I indeed forgot to specify that this will be a software RAID0, and both disks will be mounted in the regular bays of the MP.

    I know that WD prevents us from modifying the TLER values on non-RE drives these days. Is this a big problem for a soft RAID?

    Loa
     
  6. nanofrog macrumors G4

    Joined:
    May 6, 2008
    #6
    You'd be fine with the Caviar Blacks.

    No problem at all actually (others have used RE's on the MP's ICH without any issues). :)

    Even if you decided to use them and did run into issues (i.e. unstable), then you can run the TLER utility on the RAID Editions in order to change the timings (they only blocked its use on more recent consumer drives, not the RE versions).
     
  7. Loa thread starter macrumors 65816

    Loa

    Joined:
    May 5, 2003
    Location:
    Québec
    #7
    Hello,

    Thanks again nano. I thought that it would have been better to change the TLER on the Blacks when using them in a RAID, but if it's not the case, I'll save some money and get them instead of the RE4!

    Loa
     
  8. nanofrog macrumors G4

    Joined:
    May 6, 2008
    #8
    You wouldn't be able to change the TLER values on the Blacks at all (a few years ago, yes, but this is no longer possible on WD's consumer drives).

    The RE4's will of course, but they're not necessary for a stripe set on the ICH, and more expensive.
     
  9. dknightd macrumors 6502

    Joined:
    Mar 7, 2004
    #9
    Blacks fine for raid 0.
    Use the money saved to buy a couple of backup disks.
     
  10. Loa thread starter macrumors 65816

    Loa

    Joined:
    May 5, 2003
    Location:
    Québec

Share This Page