Compiling a new RHEL-4 kernel

[Matt Brookover]

After reading my response, I realized I skipped a few details. 
Depending on how your system is set up, you may need to run mkinitrd and
reboot to reconfigure scsi_mod.

Do something like:

mkinitrd -f /boot/initrd-`uname -r`.img `uname -r`
shutdown -r now


Another possibility is to unload scsi_mod and reload it:

rmmod scsi_mod
modprobe scsi_mod


The reload may fail if there are disks or other devices using scsi_mod. 
Depending on your user population, a reboot may be simpler.

Matt

On Tue, 2005-12-20 at 07:39, Matt Brookover wrote:

> Under Enterprise 3, I put this line:
> 
> options scsi_mod max_scsi_luns=128
> 
> in /etc/modules.conf.  The default is 1 lun, this configures the scsi
> module for 128 luns.
> 
> I would guess that this should work for Enterprise 4.
> 
> Matt
> 
> 
> On Mon, 2005-12-19 at 22:48, Simon wrote:
> 
> > Hi all,
> > 
> > Ok, I need to recompile my kernel to add in the 'scan all LUNS for  
> > each SCSI device' option - by default this is off, but the tape  
> > changer I've just been landed with appears to need it (at the moment  
> > I can tar to /dev/st0 but can't load/unload using /dev/sg5 :-(
> > 
> > So, I just wanted to ask a few questions...
> > 
> >   - Is there a resource where 'how to compile a kernel' is well- 
> > documented? I've spent some time looking around the RH site, but  
> > couldn't find anything useful
> > 
> >   - I've downloaded the 'kernel-2.6.9-22.0.1.EL.src.rpm' from RHN,  
> > and done a 'rpm -Uvh' on it. That's created lots (and I mean *lots*)  
> > of patch files as well as a linux-2.6.9.tar.bz2 file in /usr/src/ 
> > redhat/SOURCES. Is the linux-2.6.9.tar.bz2 pre-patched ? Or do I have  
> > to apply the patches once I've untarred the file ?
> > 
> >   - It's been a while since I made a kernel, and it all looks  
> > different. Is it just:
> > 
> > 	make menuconfig			(the machine is 5000 miles away, no X...)
> > 	make
> > 	make install
> > 
> > 	... or do I need to fiddle with initrd and alter /boot/grub.conf ?  
> > What happened to mrproper ? :-)
> > 
> >   - Anything else I ought to know ? I'd really rather not bring down  
> > the server, since it's so far away...
> > 
> > Cheers,
> > 	Simon