[Linux] scsi ide linux

[Kenneth Scharf]

Most likely you would have problems IF the kernel had
scsi emulation enabled.  This allows the scsi to be
used for ide devices.  Mostly used only for cd-r
drives, but it might confuse lilo if both scsi and ide
hard drives were present along with scsi emulation in
the kernel.
--- rscotka <rscotka@bellsouth.net> wrote:
> kerryb wrote:
> > 
> > On Thu, 12 Oct 2000, Charles Higgins wrote:
> > 
> > > I may get in trouble for this but here it goes:
> > >
> > No trouble, but I think the messages was mis-read.
> The question is on adding a ide drive to a box that
> already has a scsi drive to enjoy the inexpensive
> nature of ide to increase the overall storage of the
> box. I scanned the first part of the site, and it
> looks like it is either ide or scci, not both.
> > 
> 
> scsi and ide devices can coexist well within the x86
> environment but
> with
> certain precautions. from my own experience i found
> that an IDE drive
> which
> lacked a format caused headaches for LILO when a
> scsi drive was the boot
> drive. this mostly occured when /etc/lilo.conf was
> modified and
> /sbin/lilo
> was run to make the change stick. the ide drive
> wasn't recognized and
> thus
> the machine was rendered unbootable. i solved it by
> pulling the ide
> drive
> out when running LILO (removeable bay) but i'm sure
> there are ways
> around
> it that aren't that drastic. rule of thumb: always
> have a boot floppy at
> hand when making system changes. 
> as for performance: the newer IDE drives give SCSI
> drives a run for the
> money now and are the most cost effective solution
> to increasing your
> storage capacity. a down side is cpu utilization and
> memory. scsi drives put less of a load on the system
> by leaning hard on 
> the host bus adapter instead of the pci chipset and
> cpu.
> the major disadvantage to ide is you are limited to
> how many you can put
> in the box and the bus length is only 15 inches.
> usually you can get
> away
> with two drives on an ATA66 cable and the cdrom has
> to go to the
> secondary
> ide controller otherwise it brings the performance
> of the primary drive
> down.
> with 72GB drives now this is a moot point. Napster
> notwithstanding.....
> 
> you could start a religious war over ide vs scsi (as
> with anything else)
> but
> the gist of it is that the ATA66 drives are a good
> solution for a home
> user. (i use SCSI... :)
> 
> 
> russell
>  
> -- 
> ...and yet, as though, from far off, with scattered
> Things,
> a serious, true work were being planned.
> (Rilke)
> 
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