From f6f0a5fdee5dc8a4fa000cab58848e252d097157 Mon Sep 17 00:00:00 2001 From: evkonstantinov Date: Tue, 29 Sep 2015 20:39:20 +0300 Subject: [PATCH] Add DVR scale issue to relnotes 7.0 Change-Id: Ic5a0fd036d96f943a5223ed80f3369837e1ba0b9 (cherry picked from commit baecfa7db67ae57f1cf3855a43f8aec37aa321e2) --- pages/release-notes/v7-0/fuel_issues.rst | 1 + .../v7-0/fuel_issues/dvr_scale_issue.rst | 23 +++++++++++++++++++ 2 files changed, 24 insertions(+) create mode 100644 pages/release-notes/v7-0/fuel_issues/dvr_scale_issue.rst diff --git a/pages/release-notes/v7-0/fuel_issues.rst b/pages/release-notes/v7-0/fuel_issues.rst index 09eb86001..40f60b1ff 100644 --- a/pages/release-notes/v7-0/fuel_issues.rst +++ b/pages/release-notes/v7-0/fuel_issues.rst @@ -47,3 +47,4 @@ Known Issues .. include:: /pages/release-notes/v7-0/fuel_issues/swift_copy_issue.rst .. include:: /pages/release-notes/v7-0/fuel_issues/non_dynamic_images_known.rst .. include:: /pages/release-notes/v7-0/fuel_issues/vbox_ssh_issue.rst +.. include:: /pages/release-notes/v7-0/fuel_issues/dvr_scale_issue.rst diff --git a/pages/release-notes/v7-0/fuel_issues/dvr_scale_issue.rst b/pages/release-notes/v7-0/fuel_issues/dvr_scale_issue.rst new file mode 100644 index 000000000..f2efe264a --- /dev/null +++ b/pages/release-notes/v7-0/fuel_issues/dvr_scale_issue.rst @@ -0,0 +1,23 @@ +* With the Neutron DVR feature enabled, there are the following limitations: + + * The rate of VM creation should be less than 3 VMs per minute. + * If the constant rate of VM creation is 3 VMs per minute, + the cloud can handle the load for a minimum of 6 hours [1]_. + If the constant load persists over 6 hours, the cloud will + experience intermittent issues which will affect the + Control Plane API availability and operations. + + The 3 VMs per minute generation rate is not a regular occurrence across + the industry and is termed a "cloud storm load". For example, IBM QRadar, + which is a cloud security system, treats the 5 VMs per 30 minutes + generation rate as a severe offence [2]_. + + The actual rate numbers depend on the number of active users, number of + tenants, and the type of activity patterns. In case of self-service usage of + the cloud, when users initiate VM provisioning manually, the rate of VM + creation is typically low and does not last long. If cloud API is + used by automation for VM creation, the load on the cloud infrastructure + should be carefully evaluated and throttled on the automation level. + + .. [1] Data obtained for 200 nodes configuration with VLAN+DVR. + .. [2] See `IBM QRadar security article `_.