2.6.9 kernel compatible with cPanel?

[Mike2Own]

We are having iowait issues with RHEL 3 and the 2.4x kernels, I'm wondering if anyone knows if the 2.6.9 kernel (supposedly has the iowait issues fixed) is okay to use with cPanel? Has anyone done this already? Thanks!

[haze]

You will have issues with the 2.4 kernel branch as RHEL3 was developed with parts of 2.6 backported into the kernel, thus, running a 2.4 kernel may increase the likelyhood of issues arrising. I have had no negative results with 2.6 branch and cpanel and CentOS ( rebuild / clone of RHEL ), and i know quite a few people using it with great success.

That said, there may already be an answer out there for your iowait issue. It might just be as simple as a few tweaks to the configuration of your system.

[chirpy]

Yep, a lot of people do use 2.6.* on RHE without issues (other than the fact that you have to install it rather than relaying on RHE via up2date).

However, the IOWAIT issues are meant to have been resolved in the latest RHE kernels - are you running it? You can also disable much of the issues caused in the earlier kernels by using the following on a running system (and added to /etc/rc.d/rc.local):

echo 100 > /proc/sys/vm/inactive_clean_percent
echo 2 10 20 > /proc/sys/vm/pagecache

[kris1351]

We have 2.6.9 on most of our RHE servers and there are no issues with it.

[Mike2Own]

Yep, a lot of people do use 2.6.* on RHE without issues (other than the fact that you have to install it rather than relaying on RHE via up2date).

However, the IOWAIT issues are meant to have been resolved in the latest RHE kernels - are you running it? You can also disable much of the issues caused in the earlier kernels by using the following on a running system (and added to /etc/rc.d/rc.local):

echo 100 > /proc/sys/vm/inactive_clean_percent
echo 2 10 20 > /proc/sys/vm/pagecache

yeah, we're running 2.4.21-20.0.1 right now and the IOWAIT/3ware problem is still there. is 2.4.28 the latest?

[Mike2Own]

We have 2.6.9 on most of our RHE servers and there are no issues with it.

that is good to hear, did you notice a performance increase when you changed to the 2.6.9 kernel?

[Sinewy]

i shifted a few boxes to the 2.6.9 kernel recently and it's been much faster/better since.

[winhosting]

Is it possible for any one to post some instructions on how to upgrade the kernel from 2.4.2 to 2.6.9?

thanks

[eth00]

Is it possible for any one to post some instructions on how to upgrade the kernel from 2.4.2 to 2.6.9?

thanks

http://cpanelplanet.com/showthread.php?t=13

That is for 2.6.7 but just get the 2.6.9 source and it should work fine.

[kris1351]

Backups are much faster on the 2.6.9 kernel it seems.