Re: ide-scsi with 2 drives

From: Ron Johnson (ron.l.johnson_at_cox.net)
Date: 12/30/04

  • Next message: Ron Johnson: "Re: kernel version" 
    To: Debian-User <debian-user@lists.debian.org>
Date: Thu, 30 Dec 2004 13:26:54 -0600

    On Thu, 2004-12-30 at 09:41 -0500, Andrew Schulman wrote:
    [snip]
    > An optical drive (slow) running on the same IDE channel as a hard drive
    > (fast) will slow down data transfer to and from the hard drive, when the
    > optical drive is operating (by forcing a lower DMA mode?). So in the
    > configuration above, if both DVD drives are operating at once-- say,
    > when making a direct disc-to-disc copy-- then both hard drives become
    > slow. Bad.
    >
    > OTOH, if both hard drives are on the same IDE channel, then they may
    > compete with each other for the bandwidth on that channel. So again
    > this can slow things down.

    The thing is that, unlike SCSI, only one device can be using an
    IDE bus at any one time.

    I guess the better solution would be to have One Big Hard Drive
    on hda, and then put the 2 optical drives on hdc and hdd. (How
    often do you use 2 optical drives at the same time?

    The optimal solution is to have them each on their own channel.
    PATA, SATA & "PATA RAID sockets" fit the bill here. 

    -- 
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Ron Johnson, Jr.
Jefferson, LA USA
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