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Re: [PLUG] device IDs on boot
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If you have both scsi and ide drives in your box, it will try to boot
from ide 1st. So if your OS is on the scsi drive, make sure that your
1st ide drive is secondary (hdb). otherwise, it wont boot.
On Fri, 2003-01-31 at 13:47, eric@lucii.org wrote:
> Wayne:
>
> Your guess on the drives is substantually correct. It works like this:
>
> hda IDE bus 0 - Primary device
> hdb IDE bus 0 - Secondary device
> hdc IDE bus 1 - Primary device
> hdd IDE bus 1 - Secondary device
>
> If there is IDE raid or other IDE controllers available then it's
> hde, hdf, hdg,... etc [ no, etc is not a device :-)]
>
> The SCSI devices in my server are:
>
> sda
> sdb
>
> - instead of sc. I'm not sure what the order is. I suspect it relates
> to the drive's position on the SCSI chain. I'm sure there are
> others that have more detailed info about the SCSI and RAID issues...
> That's out of my scope :-D
>
>
> Good luck.
>
> Eric
>
> On Fri, Jan 31, 2003 at 11:54:48AM -0800, Wayne Dawson wrote:
> > I've sometimes wondered how the ids for physical disks are determined in
> > Linux. Now I'm prompted again to wonder, and in this case it makes a
> > difference in what I'm doing. While installing Linux, how do I know which
> > device id corresponds to any given physical device? Choices for a
> > particular install I'm doing are: hda (I think that's the IDE drive, which
> > I don't want to install on), sca (a SCSI device I assume), or scb (another
> > SCSI device I assume).
> >
> > If anyone has a quick explanation of how this works or where I can find it,
> > please let me know.
> >
> > Thanks,
> > Wayne Dawson
> >
> > More details for those who are interested:
> > I'm trying to install Red Hat to be booted from a RAID. I'm very new to
> > using RAID.
> >
> > The RAID is in a separate chassis from the computer I'm using to install
> > the OS. It has a hardware RAID controller (Intel SRCU31LA), and there are
> > several hard disks in the RAID chassis. The computer also has an IDE disk,
> > but ultimately this computer will not be used with this RAID (we haven't
> > bought the new computer yet).
> >
> > In the (text based) Red Hat install program, I was given the following
> > options to install onto: hda, sca, and scb. Not knowing how these device
> > names are determined, I guessed sca was where I wanted to install. The
> > install completed and now I have a system that will not boot without the
> > boot floppy (a RAID controller vs OS compatibility issue I suspect), but it
> > does indeed require the SCSI chassis to be powered on so apparently the
> > bulk of the OS resides there. However, I'm confused about this because my
> > RAID controller claims my RAID HOST has a status of "fail" (It's RAID level
> > 5 by the way, with 3 disks).
> >
> > Perhaps the disk that is not configured as part of a RAID is available
> > through the RAID controller as a standalone disk, and that's what I
> > installed the OS on?
> >
> > _________________________________________________________________________
> > Philadelphia Linux Users Group -- http://www.phillylinux.org
> > Announcements - http://lists.netisland.net/mailman/listinfo/plug-announce
> > General Discussion -- http://lists.netisland.net/mailman/listinfo/plug
> >
> >
--
_________________________________________________________________________
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