9 Replies Latest reply: Oct 18, 2013 5:33 PM by BDAqua
boiner53 Level 1 Level 1 (5 points)

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
  • 1. Re: Two partition raid.
    BDAqua Level 10 Level 10 (116,475 points)

    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.

  • 2. Re: Two partition raid.
    boiner53 Level 1 Level 1 (5 points)

    Hi BDAqua. The FW drive that I boot Tiger from is a 300gig drive. When I used a single 2TB internal drive, it was partitioned at 200gig for Tiger. Both booted fine. What is the APM limit? The 3.3TB and 384gig is the smallest I can make the smaller partition with the two 2TB drives in raid. Would it be possible not to raid the smaller partitions? Then Tiger could be installed on a 172gig block?

  • 3. Re: Two partition raid.
    BDAqua Level 10 Level 10 (116,475 points)

    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

  • 4. Re: Two partition raid.
    boiner53 Level 1 Level 1 (5 points)

    Sorry, I'm still not understanding. Are you saying that Tiger, loaded on the 300gig drive will eventually fail? It originally came on a 160gig drive. Or are you saying that when Tiger is installed on the 300gig that it makes an Apple-boot partition smaller than 2.19gigs and that is not possible on my raid? How did you get a partition on your raid smaller than 2.19gig? Also, I configured the raid from the Leopard install disc. Would making the raid from Tiger make any difference?

  • 5. Re: Two partition raid.
    BDAqua Level 10 Level 10 (116,475 points)

    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.

  • 6. Re: Two partition raid.
    boiner53 Level 1 Level 1 (5 points)

    OK. I think I understand. I will take your advice and not install both os's on the raid. I just need the Tiger for a couple of programs, so it will stay on the 300gig. The raid is used as a movie server on Leopard and is backed up with Time Machine. That's why the large storage. Thank you much for the help. This is how we learn.

  • 7. Re: Two partition raid.
    BDAqua Level 10 Level 10 (116,475 points)

    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.

  • 8. Re: Two partition raid.
    boiner53 Level 1 Level 1 (5 points)

    If it helps; I have been running a 2TB raid 0 on a single 1.6 G-5 with Leopard as a movie server for over 2 years with no problems what so ever. WD Greens. Nearly 600 movies and 300 tv shows at my fingertips thru Apple TV. Thanks again for your help.

  • 9. Re: Two partition raid.
    BDAqua Level 10 Level 10 (116,475 points)