Just small update about overcommit ratios As recommended by Red Hat<https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/5/html/Virtualization/sect-Virtualization-Tips_and_tricks-Overcommitting_with_KVM.html> vCPU/CPU (cpu_allocation_ratio) = 5 (default 16) vRAM/RAM (ram_allocation_ratio) = 1.5
Thanks. On Fri, Apr 4, 2014 at 1:04 PM, Roman Sokolkov <[email protected]>wrote: > Folks, > > Any updates on that? > Customers that run Fuel for production exactly need finely tuned scheduler. > My two latest projects were affected by default "RAW" scheduling. > > Thank you. > > > On Fri, Mar 21, 2014 at 7:18 AM, Bogdan Dobrelya > <[email protected]>wrote: > >> On 03/21/2014 03:04 PM, Dmitry Ukov wrote: >> > Core and Disk filters should be enabled (they are disabled by default) >> > in order to avoid compute node oveloading >> > - cpu_allocation_ratio=1.0 - was customer requirement. I think 16.0 is >> > way to big over commit ratio (potentially 16 vms on 1 core). I would say >> > 2.0 or 3.0 will be reasonable here. >> > - disk_allocation_ratio=1.0 - it is unsafe to over commit disk >> > - ram_allocation_ratio=1.0 - this was customer requirement. Actually we >> > can use default value here. (AFAIR default is 1.5 ) >> > - ram_weight_multiplier=0.0 and scheduler_host_subset_size=30 will help >> > us to get random VMs distribution if compute nodes significantly differ >> > from each other in terms of total RAM amount >> >> Thank you, that makes sense. I vote for enable these ones (leaving the >> ram_allocation_ratio defaults) for Fuel nova manifests for Puppet. That >> do you think? >> >> > >> > >> > >> > On Thu, Mar 20, 2014 at 2:58 PM, Bogdan Dobrelya < >> [email protected] >> > <mailto:[email protected]>> wrote: >> > >> > On 03/20/2014 08:47 AM, Mike Scherbakov wrote: >> > > Hi Dmitry, >> > > I was running through bp created by >> > > you: >> > >> https://blueprints.launchpad.net/fuel/+spec/scheduler-config-improvements >> . >> > > >> > >> > Interesting, why CPU overcommitment defaults ( >> > >> https://github.com/openstack/nova/blob/master/etc/nova/nova.conf.sample#L1759 >> > ) are so 'bad' to being changed so drastically 16->1? >> > >> > > I'm wondering whether this config will work fine for every >> > installation >> > > we do with Fuel.. what are the possible limitations / corner >> cases? >> > > >> > > Thanks, >> > > -- >> > > Mike Scherbakov >> > > #mihgen >> > > >> > > >> > >> > >> > -- >> > Best regards, >> > Bogdan Dobrelya, >> > Skype #bogdando_at_yahoo.com <http://bogdando_at_yahoo.com> >> > Irc #bogdando >> > >> > >> > >> > >> > -- >> > Kind regards >> > Dmitry Ukov >> > IT Engineer >> > Mirantis, Inc. >> > >> >> >> -- >> Best regards, >> Bogdan Dobrelya, >> Skype #bogdando_at_yahoo.com >> Irc #bogdando >> >> -- >> Mailing list: https://launchpad.net/~fuel-dev >> Post to : [email protected] >> Unsubscribe : https://launchpad.net/~fuel-dev >> More help : https://help.launchpad.net/ListHelp >> > > > > -- > Roman Sokolkov, > Deployment Engineer, > Mirantis, Inc. > Skype rsokolkov, > [email protected] > -- Roman Sokolkov, Deployment Engineer, Mirantis, Inc. Skype rsokolkov, [email protected]
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