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Software RAID 0 Worth It?

999 Views 7 Replies Latest reply: Feb 4, 2013 8:45 PM by Glen Doggett RSS
bubbamj Level 1 Level 1 (10 points)
Currently Being Moderated
Feb 2, 2013 10:39 PM

I tried looking for answers, and I dont know if I'm blind or asking it wrong, but yeah...

 

Using RAID 0 with identical SATA drives on my Late 2005 quad G5 via the stock SATA ports... Is it worth it? Im assuming this is software RAID, not hardware? Does it actually have a benefit at all, or would it simply slow it down like it does on my G4 MDD because those are IDE and on the same bus...?

 

Would I need a PCI SATA RAID card to be able to benefit from RAID 0 in 10.5?

 

Thanks in advance guys!

PowerMac G5 (Late 2005), Mac OS X (10.5.8), Quad 2.5GHz, 6GB, GeForce 6600
  • japamac Level 7 Level 7 (24,390 points)
    Currently Being Moderated
    Feb 2, 2013 11:02 PM (in response to bubbamj)

    A RAID on the internal ports is a software RAID.

    It shouldn't slow the machine but increases the requirement for a reliable, external backup.

    In a Quad, some test results:

    http://barefeats.com/hard63.html

     

    The drives used are old, out of production, but WD 2TB Blacks or RE, WD VelociRaptors, Hitachi 2TB 7K would make excellent candidates.

    Some SATA rev. 2 SSD drives would also be fast.

     

    The internal bus is the choke point for all these fast drives.

     

    Use of a port multiplier PCIe controller card to an external housing array is the fastest hardware RAID for a G5.

    The following tests are done in a Mac Pro, but the controller and housing can be used with a dual core G5.

    You'll get the idea:

    http://www.firmtek.com/seritek/seritek-2me4-e/perform/

  • romko23 Level 2 Level 2 (395 points)
    Currently Being Moderated
    Feb 2, 2013 11:27 PM (in response to japamac)

    FYI... for the OP,

     

    But the OP must understand that a RAID 0 or striped RAID is volatle. Should one of his hard disks fail, he will LOSE all information as the two like drives are linked as one. This has happened to a friend of mine and the results were CATASTROPHIC at best.. I had to help him for 3 hours recover all his stuff from memory of what he remembered..

     

    I warned him to make a backup of his system.. but he failed to do so. That is the ONLY drawback with a RAID 0. While yes, it will increase speed and performance of your system, there is a risk of hard drive failure down the road. Plan a backup accordingly should you have any issues with your RAID system.

     

    Romko

     

    PS: Techtool Pro, and Smart Utility + Disk Utility and others will report to you failing hard drives.

  • romko23 Level 2 Level 2 (395 points)
    Currently Being Moderated
    Feb 2, 2013 11:52 PM (in response to bubbamj)

    Sorry, my mistake.. if you use Disk Utility to create the RAID 0, this is a software raid.. versus if you had a RAID card in your G5 that would be a hardware RAID.

     

    The MDD G4 has an IDE bus, so of course its going to be much slower.. Unless you get a PCI SATA card..  The good news here is that the G5 Quad's SATA ports are SATA I specs.. meaning they go as high as 150 gigabits per second.. SATA II goes up to 3 GB/S, and SATA III is a whopping 6GB/S.. To obtain these high speeds would require an SSD drive.

     

    A RAID 0 is going to feel almost as fast as an SSD. The G5's SATA I ports are independent of each other, so no slow down would occur.

  • romko23 Level 2 Level 2 (395 points)
    Currently Being Moderated
    Feb 3, 2013 4:30 PM (in response to bubbamj)

    Its ok.. sometimes I get carried away with providing assistance to everyone.

  • Glen Doggett Level 4 Level 4 (1,780 points)
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    Feb 4, 2013 8:45 PM (in response to bubbamj)

    bubbamj wrote:

     

    .... would it simply slow it down like it does on my G4 MDD because those are IDE and on the same bus...?

     

    Would I need a PCI SATA RAID card to be able to benefit from RAID 0 in 10.5?

    Definitely the IDE/PATA drives in a G4 MDD would need a PCI RAID card, but even the hardware cards do not RAID 0 a pair of drives on the same cable.  (I don't think a single ribbon cable can communicate to both drives simultaneously.  Software RAID0 of 2 IDE drives on the same cable may theoretically cut your speed in half.)  So, even the hardware RAID 0 pair must consist of Master-Master pair or Slave-Slave pair, each drive on their own cable.  Benchmarks of harware PCI ATA133 RAID 0 are just about in the ball-park of a single-drive SATA anyway.

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