Hyper-V and Numa

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Posted by SAHostKing, 10-12-2014, 02:09 AM
Hi guys, Do you guys set NUMA to be disabled in Hyper-V. or what do you recommend as we run a few cPanel servers in Hyper-V? Also does linux auto pickup the NUMA is off our must I still set numa=off in grub.conf Thanks
Posted by Softsys Hosting, 10-12-2014, 02:29 AM
NUMA=Allow works fine with Linux - CentOS on our dev/test server No issues with it..
Posted by Xarix-Jeff, 10-12-2014, 03:14 AM
The numa option must be set to "off" on CentOS 6.x guests. There's a known bug where the CentOS 6 guest will crash if the processor count spans across 2 NUMA nodes. Good news is CentOS 7 and distributions with a more recent kernel should be safe to run with NUMA settings left to the defaults.
Posted by Xarix-Jeff, 10-15-2014, 07:17 PM
Just as a follow update. RHEL 6.6 fixes the issue where a NUMA guest crashes on a Hyper-V host. And as a side node, according to the changelog with the RHEL 6.6 kernel, it seems like it is capable of booting off a Generation 2 Configuration. Edit: Read the changelog a bit too prematurely, they only made mention about Generation 2 fixes being backported into the hyperv_fb driver, nothing else. Last edited by Xarix-Jeff; 10-15-2014 at 07:26 PM.
Posted by europhosting, 11-06-2014, 03:23 PM
Same here. Been running on production machines for over a year.