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  1. #1
    yieldsign2
    Guest
    Poor SCSI performance in OSX vs OS 9
    I am using a magneto optical drive to view images for a healthcare business.

    The time to load images in the program via a 400mhz g4 OS 9 = 40 seconds and the time on an 800mhz g4 with OS X is somewhere around 60-70 seconds.

    The MO drive is SCSI.

    Does anyone have any ideas as to why this would be? Is there known issues with SCSI drivers in OSX, etc?
    Thanks.

  2. #2
    Poor SCSI performance in OSX vs OS 9
    macman88's Avatar
    Member Since
    Feb 06, 2005
    Posts
    306
    Specs:
    Ibook g4 1.33, 768 ram
    how much ram in each system?

  3. #3
    Badger
    Guest
    SCSI support in OS X has never been optimal. Since Apple began phasing out SCSI with the original iMac (1998) it's not been a priority.

  4. #4
    yieldsign2
    Guest
    1gb in teh newer machine (the osx machine) and 512 in the earlier.

  5. #5
    yieldsign2
    Guest
    Classic mode runs a LOT slower. But it is acting like its reading at 1.3mb/s (61 seconds for 92 mb file). Perhaps it is supposed to be ultra scsi?

    The weird thing is, when reading a second time, it loads completely from memory, doesn't access the MO at all. None of the other machines (that read faster) do this. It seems the reason it is taking so long is it is taking from the MO, storing to memory, and when finished, then reading from memory the data. Is there any way to change the memory handling?

  6. #6
    Poor SCSI performance in OSX vs OS 9
    jhelm007's Avatar
    Member Since
    Oct 18, 2004
    Location
    Norfolk, VA, USA
    Posts
    629
    Specs:
    MacBook: 2GHz, 2GB RAM, 120GB HD; PowerTower Pro (300MHz G3 clone): 608MB RAM, 10GB HD
    Quote Originally Posted by yieldsign2
    I am using a magneto optical drive to view images for a healthcare business.

    The time to load images in the program via a 400mhz g4 OS 9 = 40 seconds and the time on an 800mhz g4 with OS X is somewhere around 60-70 seconds.

    The MO drive is SCSI.

    Does anyone have any ideas as to why this would be? Is there known issues with SCSI drivers in OSX, etc?
    Thanks.
    If the 800 GHz machine can dual boot it might be worthwhile to boot into OS9 for this particular app. I think OS9 just deals with SCSI better. do the two machines use the same kind of SCSI host adapter?

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