I am trying to install 6.2 on a machine. I am using PXE as I have done so a number of times.
My hard disk is being detected as sdb and not sda. My kickstart config is wanting it at sda.
There are no other disks in the unit. It has and SD slot and an esata although BIOS does not appear to have a disable for either of those devices.
Is there anyway to "force" the disk to sda ? or find out what its detecting at sda and disable that from the PXE boot line?
Doing " dmesg | grep sda" does say SCSI removable disk.
So how can I tell linux to NOT include that when installing?
Thanks,
jerry
On 02/03/2012 12:24 PM, Jerry Geis wrote:
I am trying to install 6.2 on a machine. I am using PXE as I have done so a number of times.
My hard disk is being detected as sdb and not sda. My kickstart config is wanting it at sda.
There are no other disks in the unit. It has and SD slot and an esata although BIOS does not appear to have a disable for either of those devices.
Is there anyway to "force" the disk to sda ? or find out what its detecting at sda and disable that from the PXE boot line?
Doing " dmesg | grep sda" does say SCSI removable disk.
So how can I tell linux to NOT include that when installing?
Thanks,
jerry
Using the kernel boot option "nousb" lets me install. However, that also stops my usb keyboard from working.
I just need to know how to block the usb-storage driver from loading. I tried "rdblacklist=usb-storage" but that did not work.
What am I missing? Thanks,
Jerry
Hello Jerry,
On Fri, 03 Feb 2012 12:24:14 -0500 Jerry Geis geisj@pagestation.com wrote:
I am trying to install 6.2 on a machine. I am using PXE as I have done so a number of times.
My hard disk is being detected as sdb and not sda. My kickstart config is wanting it at sda.
There are no other disks in the unit. It has and SD slot and an esata although BIOS does not appear to have a disable for either of those devices.
Is there anyway to "force" the disk to sda ? or find out what its detecting at sda and disable that from the PXE boot line?
Doing " dmesg | grep sda" does say SCSI removable disk.
So how can I tell linux to NOT include that when installing?
I noticed that behaviour with my CentOS6 (installed and kept up-to-date using yum). This happened since kernel kernel-2.6.32-220.el6.x86_64 and furthers updates. Was working as expected (my laptop's hdd mounted as sda) with previous kernels, up to kernel-2.6.32-131.21.1.el6.x86_64.
I wonder if that behaviour, and the *change* of behaviour is an issue that should be reported, and how to handle it on installed systems! For now, I'm either booting w/ no USB disk plugged, or booting a 2.6.32-131 kernel.
Regards,
On Feb 3, 2012, at 1:34 PM, wwp subscript@free.fr wrote:
Hello Jerry,
On Fri, 03 Feb 2012 12:24:14 -0500 Jerry Geis geisj@pagestation.com wrote:
I am trying to install 6.2 on a machine. I am using PXE as I have done so a number of times.
My hard disk is being detected as sdb and not sda. My kickstart config is wanting it at sda.
There are no other disks in the unit. It has and SD slot and an esata although BIOS does not appear to have a disable for either of those devices.
Is there anyway to "force" the disk to sda ? or find out what its detecting at sda and disable that from the PXE boot line?
Doing " dmesg | grep sda" does say SCSI removable disk.
So how can I tell linux to NOT include that when installing?
I noticed that behaviour with my CentOS6 (installed and kept up-to-date using yum). This happened since kernel kernel-2.6.32-220.el6.x86_64 and furthers updates. Was working as expected (my laptop's hdd mounted as sda) with previous kernels, up to kernel-2.6.32-131.21.1.el6.x86_64.
I wonder if that behaviour, and the *change* of behaviour is an issue that should be reported, and how to handle it on installed systems! For now, I'm either booting w/ no USB disk plugged, or booting a 2.6.32-131 kernel.
You can try disabling USB disk support in the bios.
-Ross
Hello Ross,
On Fri, 3 Feb 2012 16:01:53 -0500 Ross Walker rswwalker@gmail.com wrote:
On Feb 3, 2012, at 1:34 PM, wwp subscript@free.fr wrote:
Hello Jerry,
On Fri, 03 Feb 2012 12:24:14 -0500 Jerry Geis geisj@pagestation.com wrote:
I am trying to install 6.2 on a machine. I am using PXE as I have done so a number of times.
My hard disk is being detected as sdb and not sda. My kickstart config is wanting it at sda.
There are no other disks in the unit. It has and SD slot and an esata although BIOS does not appear to have a disable for either of those devices.
Is there anyway to "force" the disk to sda ? or find out what its detecting at sda and disable that from the PXE boot line?
Doing " dmesg | grep sda" does say SCSI removable disk.
So how can I tell linux to NOT include that when installing?
I noticed that behaviour with my CentOS6 (installed and kept up-to-date using yum). This happened since kernel kernel-2.6.32-220.el6.x86_64 and furthers updates. Was working as expected (my laptop's hdd mounted as sda) with previous kernels, up to kernel-2.6.32-131.21.1.el6.x86_64.
I wonder if that behaviour, and the *change* of behaviour is an issue that should be reported, and how to handle it on installed systems! For now, I'm either booting w/ no USB disk plugged, or booting a 2.6.32-131 kernel.
You can try disabling USB disk support in the bios.
Right, but I can't make such settings permanent, as I need to boot from a USB disk from time to time, thus, entering BIOS and changing settings costs more than unplugging stuff :-).
An aspect of the problem w/ that behaviour change introduced w/ recent kernel updates, is that some mount mapping tables (fstab for instance) are broken if they rely on mount order (sda, hda, etc.) instead of device ID or label.
Regards,
On Feb 3, 2012, at 5:02 PM, wwp subscript@free.fr wrote:
Hello Ross,
On Fri, 3 Feb 2012 16:01:53 -0500 Ross Walker rswwalker@gmail.com wrote:
On Feb 3, 2012, at 1:34 PM, wwp subscript@free.fr wrote:
Hello Jerry,
On Fri, 03 Feb 2012 12:24:14 -0500 Jerry Geis geisj@pagestation.com wrote:
I am trying to install 6.2 on a machine. I am using PXE as I have done so a number of times.
My hard disk is being detected as sdb and not sda. My kickstart config is wanting it at sda.
There are no other disks in the unit. It has and SD slot and an esata although BIOS does not appear to have a disable for either of those devices.
Is there anyway to "force" the disk to sda ? or find out what its detecting at sda and disable that from the PXE boot line?
Doing " dmesg | grep sda" does say SCSI removable disk.
So how can I tell linux to NOT include that when installing?
I noticed that behaviour with my CentOS6 (installed and kept up-to-date using yum). This happened since kernel kernel-2.6.32-220.el6.x86_64 and furthers updates. Was working as expected (my laptop's hdd mounted as sda) with previous kernels, up to kernel-2.6.32-131.21.1.el6.x86_64.
I wonder if that behaviour, and the *change* of behaviour is an issue that should be reported, and how to handle it on installed systems! For now, I'm either booting w/ no USB disk plugged, or booting a 2.6.32-131 kernel.
You can try disabling USB disk support in the bios.
Right, but I can't make such settings permanent, as I need to boot from a USB disk from time to time, thus, entering BIOS and changing settings costs more than unplugging stuff :-).
An aspect of the problem w/ that behaviour change introduced w/ recent kernel updates, is that some mount mapping tables (fstab for instance) are broken if they rely on mount order (sda, hda, etc.) instead of device ID or label.
I remember faintly there was abway to specify module order in C5 modprobe and regenerate the initrd to make it persistent, but I don't think C6 uses modprobe. Maybe there is an initrd option under /etc/sysconfig.
Once that's done you can re-enable USB disk support in the BIOS.
-Ross
wwp <subscript@...> writes:
Hello Ross,
On Fri, 3 Feb 2012 16:01:53 -0500 Ross Walker <rswwalker@...> wrote:
On Feb 3, 2012, at 1:34 PM, wwp <subscript@...> wrote:
Hello Jerry,
On Fri, 03 Feb 2012 12:24:14 -0500 Jerry Geis <geisj@...> wrote:
I am trying to install 6.2 on a machine.
<snip>
Doing " dmesg | grep sda" does say SCSI removable disk.
So how can I tell linux to NOT include that when installing?
<snip>
You can try disabling USB disk support in the bios.
Right, but I can't make such settings permanent, as I need to boot from a USB disk from time to time, thus, entering BIOS and changing settings costs more than unplugging stuff .
An aspect of the problem w/ that behaviour change introduced w/ recent kernel updates, is that some mount mapping tables (fstab for instance) are broken if they rely on mount order (sda, hda, etc.) instead of device ID or label.
Regards,
This seems to be BIOS dependent. I use an external USB hard disk as my portable computer. On my personal laptop the external drive shows up as /dev/sdb even if I boot from the external. If I recall correctly, it's /dev/sda on my work laptop. Doing mounts using UUIDs means everything "just works" regardless of drive lettering.
Bottom line is play with the BIOS settings. You may find a combination that gets you the right drive letters and lets you boot from the USB when you need to. On the other hand, my personal laptop BIOS "forgets" about the boot from external USB drive if I boot with the drive not present. I have to go into the BIOS and reset to boot from external the next time I try to use it.
Cheers, Dave
-
David G. Miller -
Jerry Geis -
Ross Walker -
wwp