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You're assuming he just wants to update to the latest kernel for RHEL5 and also assuming he doesn't have any other things to take into consideration such as drivers installed for other things (e.g. Qlogic fibre cards). I suggested he read the deployment guide section on Kernel updates to gain an understanding of the kernel updates for RedHat which are a bit different than for other Linux flavors.
sree.m for the OLDER 5.3 you are paying red hat a boatload of cash to STAY with 5.3 .I an guessing ,for some NEEDED program .
So you NEED to STAY with that REQUIRED kernel version, for this unnamed old program .
if not then upgrade to the current in the 5 series 5.8
or install the current release RHEL 6.2
I would possibly go for RHEL contract renewal as the servers are in production environment, however it would be nice if i could resolve the issue as the renewal process would take long time.
Sorry, that's just not the case. RedHat can renew your contract over the phone.
Can you please suggest if there is anything i must be careful before I go for "yum update" , this is very much concerned as the servers are in production.
If you're not under contract with RedHat, "yum update" won't work, since you don't have access to the RHEL network. Again, if you have production servers, running RHEL under contract, call RedHat support if you have questions/concerns. Otherwise, you won't be able to use the yum online update functions, and will have to do EVERYTHING manually, if you can do it at all. RHEL kernel updates aren't available unless you pay for them.
Well if you have a lab environment, you can try setting up a yum repo that uses the CentOS repo. CentOS is redhat. Or just try using rpm. Download the applicable kernel and run rpm -Fvh kernel.* (use rpm -Uvh for all other packages.) If you are having a cluster problem, odds are it is not being caused by a kernel. You question should really be on what problems you are having with a Linux Cluster, not on a kernel upgrade.
what i meant by difficulty in renewing RHEL account is budget related , still i understand the concern of RHEL in renewing the account for software/patch installation.In that case I will have to speed up the renewal process. Anyways thanks for the information.