Thursday, 2019-08-08

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gregworkin os::server:nova using04:17
gregworkscheduler_hints:04:17
gregwork  different_servers:04:17
gregwork    - hypervisor uuid04:17
gregwork    - hypervisor uuid04:17
gregworkwill that round robin instance deployment given a set of instances in a resource group ?04:17
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arnoldoreeHi.  I can see the benefit and potential of running an OpenStack cloud in a fully virtualized environment (i.e. through nested virtualization). I would be willing to give up a degree of performance for this. Does anyone know roughly what the performance cost is for deploying OpenStack nodes as VMs as opposed to bare metal hosts, where the guest hypervisor has full access to the bare metal host's hardware-assisted virtualization extensions? B10:39
arnoldoreeare metal host & guest hypervisor: Debian Buster > current: QEMU/KVM10:39
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DHEarnoldoree: as I understand it there is an extra VM transition step as intel chips don't actually allow hypervisor nesting, so it's emulated on the bare metal host.12:05
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mhenhey there12:45
mhenwhich is / will be the first fully Python 3 based OpenStack release?12:45
willksmmhen: is this useful?  https://governance.openstack.org/tc/resolutions/20180529-python2-deprecation-timeline.html12:48
mhenwillksm, thanks for the link! So Train will be the first if everything goes smoothly?12:49
willksmWell it states "most of our projects can claim at least basic support for Python 3" but I wouldn't personally be able to say which projects / which version that applies to12:50
willksmBut this was updated over a year ago so perhaps most if not all projects support python 3 at this point.12:51
arnoldoreeDHE: thanks, I have implemented a guest hypervisor (with QEMUbased hardware-assisted virtualization) and tested that that the all cpu features are available to the nested hypervisor. My understanding from study / research / implementation is that QEMU abstracts the host processor / provides an emulated processor that supports nesting. Is this what you mean when you say an extra transition step?... And is there an idea of what the performance12:54
arnoldoree cost might be for this non-support by Intel relative to the general performance gap between L0, L1, and L2 virtualization?12:54
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DHEarnoldoree: L1 will think it's providing hardware virtualization, but each VMX operation will be emulated by L0 instead13:07
DHEthe CPU isn't really "emulated". VMX is kinda the exception where a supported feature is faked because it's already in use. you can strip features off the real CPU, but you can't add to them.13:08
DHEyou can't add avx512 to a CPU that doesn't have it, but you can take avx512 away from a VM where the real CPU does support it13:09
arnoldoreeAre you meaning that rather than emulating QEMU is simply exposing the features already present on the CPU hardware... And that in effect the guest hypervisor is more-or less allocated processor time for L0 to execute with an L1 mask / hat / identity?... And if so, does this mean that there should be marginal (less than 5%) performance deterioration for L1 vs L2 hypervisor execution, as there are no real layers of abstraction to compute betw13:16
arnoldoreeeen L0 and L1 as far as processing goes?13:16
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arnoldoree<< DHE13:21
arnoldoree* performance deterioration for L0 vs L1 hypervisor execution,...13:24
DHEthe VM instructions are emulated by KVM by using the real hardware VM features, yes13:25
DHEbut every transition between L1 and L2 actually goes through L0 first13:25
DHEhow much overhead is that? I don't know. it'll be workload dependent. heavy IO would make it worst for example13:26
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arnoldoreeDHE: that's a good explanation which provides an actionable framework to proceed with towards a final determination. Thanks. Given the operating model that you have outlined, the final decision will ultimately come down to comparative performance testing given the target workloads.13:51
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triple-oh-noobJust tryig to deploy isolated networks with the standard network options available, but getting "NotSupported: resources.VipPort: Unable to properties network of VipPort (OS::TripleO::Network::Ports::ControlPlaneVipPort) is not supported" - anyone any ideas?17:16
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daniel2Had a controller lose its DB, and we needed some data from the instances but the instances cannot be brought back because of the DB being gone.  Is it possible to go onto the nova node and access the ephemeral storage from the host>17:32
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umbSublimedaniel2: is it local storage ?17:58
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umbSublimeAlso, assuming kvm w. libvirt, if everything is already correctly configured on neutron side. You can potentially just "virsh start <uuid>"18:00
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daniel2umbSublime: yeah its local storage.19:28
umbSublimethen sure just mount the disk file19:28
umbSublimevirsh dumpxml <uuid> | grep "source file"19:29
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daniel2oh neutron was on the controller.19:29
umbSublimeI don't follow19:29
daniel2Neutron data is gone19:30
daniel2So we would have no way to connect.19:30
umbSublimedaniel2: you have access to the host right ?19:30
daniel2Yeah19:30
umbSublimethen just mount the disk file19:30
umbSublimeand extract the info you need from it19:30
umbSublimeor just re-up the broken DB, and reboot --hard19:31
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stewie925hello everyone, can devstack handle installation of python3  by just setting USE_PYTHON3 to True?20:24
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hpulavHello, the image conversion plugin in glance doesn't seem to be executing for me. From the logs, I can see that it is receiving and pushing it to the staging area appropriately but not converting the image. It is pushing the unconverted image (not raw) into ceph. I have explicitly enabled the image conversion options in the glance-image-import.conf20:51
hpulav file. I can give more details if needed. Glance version 18.0.0 is being used here.20:51
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shaneranybody have issues deleting glance images backed by rbd?21:37
shanerwhen I try, it times out, unable to delete21:37
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