x/development-proposals
Code Issues Proposed changes

Merge "be more precise about failure events"

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2016-06-09 20:01:48 +00:00
committed by Gerrit Code Review
parent 887e35dd5d e8b6d26043
commit 4e8fc3f6cc
1 changed files with 6 additions and 6 deletions
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12
user-stories/proposed/ha_vm.rst
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@@ -52,11 +52,11 @@ can be detected and recovered by the system. Possible failure events include:
* ``nova-compute`` service crashes or becomes unresponsive. * ``nova-compute`` service crashes or becomes unresponsive.
* Compute host is down. * Compute host crashes or hangs.
* Hypervisor has failed (e.g. libvirtd process is dead or unresponsive). * Hypervisor fails, e.g. libvirtd process dies or becomes unresponsive.
* Network is down * Network component fails.
There are many ways a network component could fail, e.g. NIC There are many ways a network component could fail, e.g. NIC
configuration error, NIC driver failure, NIC hardware failure, cable configuration error, NIC driver failure, NIC hardware failure, cable
@@ -91,11 +91,11 @@ The goal of the user story is to reduce that interruption via automated recovery
Usage Scenario Examples Usage Scenario Examples
+++++++++++++++++++++++ +++++++++++++++++++++++
* VM is down * Recovery from VM failure
Monitor the VM. Detect VM down failure and notify system to recover the VM. Monitor the VM. Detect VM down failure and notify system to recover the VM.
* VM provisioning process is down * Recovery from ``nova-compute`` failure
Monitor the provisioning process (nova-compute service). Detect Monitor the provisioning process (nova-compute service). Detect
process failure and notify system to restart the service. process failure and notify system to restart the service.
@@ -107,7 +107,7 @@ Usage Scenario Examples
the hosts must be fenced to prevent two instances writing to the same shared the hosts must be fenced to prevent two instances writing to the same shared
storage that lead to data corruption. storage that lead to data corruption.
* Hypervisor host is down * Recovery from hypervisor host failure
Monitor the hypervisor host. When failure is detected, resurrect Monitor the hypervisor host. When failure is detected, resurrect
all VMs from the failed host onto new hosts that enable an all VMs from the failed host onto new hosts that enable an