Re: creaing new 3.0.4 kernel in squeeze --kernel panic
On Tue, 01 Nov 2011 20:00:54 -0400, Stephen Powell wrote:
> On Tue, 01 Nov 2011 19:46:13 -0400 (EDT), Walter Hurry wrote:
>> On Tue, 01 Nov 2011 19:43:20 -0400, Stephen Powell wrote:
>>> It is important that you *not* use traditional device nomenclature,
>>> such as
>>> /dev/hda1 /dev/sda1
> Two reasons. First, whether an IDE hard disk shows up as /dev/hda,
> /dev/hdb, etc. or /dev/sda, /dev/sdb, etc. depends on which drivers are
> being used. For example, the 2.6.32-3-686 kernel and earlier ones use
> the traditional IDE drivers, with device names /dev/hda, /dev/hdb, etc.
> The 2.6.32-5-686 and later kernels use the libata SCSI emulation
> drivers, with device names /dev/sda, /dev/sdb, etc.
> Second, the devices are not necessarily discovered in the same order
> every time with newer kernels. Let's say you have a system with one
> hard disk and one CD-ROM drive. On one boot, your hard disk may be
> assigned device name /dev/sda and the CD-ROM drive may be assigned the
> device name /dev/sdb. But on the next boot, it is possible that the
> CD-ROM drive may be assigned the device name /dev/sda and the hard disk
> may be assigned the device name /dev/sdb. You can never be sure.
> By using UUIDs or LABELs, you will always get the same physical
> partition mounted as the root file system every time, regardless of what
> its device name happens to be in the current boot. The same applies to
> non-root file sytems in /etc/fstab (i.e. /boot, /home, etc.)
But my (single internal) hard disk is always /dev/sda, and my two
external USB disks are always /dev/sdb and /dev/sdc. So what difference
does it make?