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Two partition raid.

385 Views 9 Replies Latest reply: Oct 18, 2013 5:33 PM by BDAqua RSS
boiner53 Calculating status...
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Oct 15, 2013 10:32 PM

Hi everyone. Power PC duel 2.5. Two internal 2TB Wd blacks in raid 0. I partitioned the drives exactly the same then raided both with DU. 3.3TB and 384 gig. Installed Leopard on the 3.3TB, Tiger on the 384gig. Leopard will boot, Tiger will not. Shows ? on boot then switches to Leopard. Is this normal for apple software raid? This setup works on a single 2TB drive with 2 partitions. Reason for trying this is to not have to keep external FW drive with Tiger. Thanks for any info.

DP 2.5GHz G5 PPC, Mac OS X (10.4.11), 4g Ram,1TB Raid 0 HD, Tempo 4+4 sata PCI-X 1.1TB Raid 2.8ghz MBP
  • BDAqua Level 10 Level 10 (114,715 points)
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    Oct 16, 2013 9:46 AM (in response to boiner53)

    Hmmm, I boot Tiger from a 2 GB RAID 0 on a quad G5, so my thought is it's to do with the APM 2.19 GB limit, thinking Tiger is on the Partition that runs past that.

  • BDAqua Level 10 Level 10 (114,715 points)
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    Oct 16, 2013 10:51 PM (in response to boiner53)

    I think over 2.19 GB wil caause problems even on the now bootable drive eventually...

    The Apple Partition Map maps out all space used (including the map) and unused (free space) on disk, unlike the minimal x86 master boot record that only accounts for used non-map partitions. This means that every block on the disk (with the exception of the first block, Block 0) belongs to a partition.

     

    http://en.wikipedia.org/wiki/Apple_Partition_Map

  • BDAqua Level 10 Level 10 (114,715 points)
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    Oct 17, 2013 1:51 PM (in response to boiner53)

    Tiger should work fine on a 300 GB drive, even a 2 TB drive.

    How did you get a partition on your raid smaller than 2.19gig?

    Two 1 GB Drives in a RAID 0 configuration.

    Would making the raid from Tiger make any difference?

    I do not think so.

     

    If I'm understanding correctly, you want this 4 TB setup to boot both Tiger & Leopard, which I don't advise, but if at al possible, you'd need both 10.4 & 10.5 on Partitions on the first 2.19 GB, say 1 TB for 10.4, 1 TB for 10.5... leaving 2 TB at the end unused, or at least unreliable.

  • BDAqua Level 10 Level 10 (114,715 points)
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    Oct 17, 2013 6:32 PM (in response to boiner53)

    Great news, glad I could help, thanks!

     

    Please let us know if that bigger than recommended RAID causes problems later, I hope it doesn't, but will be of interest in learning wheter it does or doesn't.

  • BDAqua Level 10 Level 10 (114,715 points)
    Currently Being Moderated
    Oct 18, 2013 5:33 PM (in response to boiner53)

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