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Old 03-12-2008, 12:17 PM   #1
Farmer Baker
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Talking Change kernel loaded from 2.6.9-55.ELlargesmp to 2.6.9-55.ELsmp

We are trying to load RHEL AS 4 Update 5 on a 4 CPU quad core HP DL580 G5 (7350 2.93Ghz).

It is loading the 2.6.9-55.ELlargesmp kernel which is not compatible with some multipathing drivers we want to load. These are compatible with the 2.6.9-55.ELsmp kernel which is not being compiled on installation.

How do we control the kernels that are compiled and loaded on installation?
Old 03-12-2008, 02:47 PM   #2
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Check and see if you have the kernel you want first;

rpm -qa 'kernel*'

If yes then simply as root using your choice of editor to make this the default kernel by editing the /boot/grub/grub.conf file, remember the counting starts at zero.

If not then install the kernel you want;

Using the installation media as the source: rpm -ivh kernel-2.6.9-55.ELsmp*.rpm --force
Using RHN: up2date --nox -f kernel-2.6.9-55.ELsmp

Then modify the /boot/grub.grub.conf file.
Old 03-13-2008, 09:42 AM   #3
Farmer Baker
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Smile RHEL 4 2.6.9-55.ELsmp kernel max CPUs/cores


Thanks for that. We have loaded and successfully forced the load of the ELsmp kernel, but this only shows 8 of the 16 cores present. One of my colleagues has since found a restriction that RHEL 4 U5 can only support 8 cores or CPUs with the ELsmp kernel.

(Taken from
The largesmp kernel is required for any AMD64 or Intel EM64T host with more than 8 CPU cores (regardless of how many sockets).
On supported architectures, systems with greater than 8 cpus will get automatically installed with largesmp kernels.

Hence we have to use the 2.6.9-55.ELlargesmp kernel to get all 16 cores in RHEL 4 U5 or use RHEL 5 which has better support for quad core with the standard ELsmp kernel.

Thanks - problem closed


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