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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CLOUDSTACK-9782) Host HA
Date Wed, 24 Oct 2018 09:33:00 GMT

    [ https://issues.apache.org/jira/browse/CLOUDSTACK-9782?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16662003#comment-16662003
] 

ASF GitHub Bot commented on CLOUDSTACK-9782:
--------------------------------------------

izenk commented on issue #1960: [4.11/Future] CLOUDSTACK-9782: Host HA and KVM HA provider
URL: https://github.com/apache/cloudstack/pull/1960#issuecomment-432585145
 
 
   @borisstoyanov thanks, went through docs, but still unclear for me the exact configuration..
   There is no description what should be done to enable and configure HA (Is it enough to
switch it on in UI or not?).
   What are requirements from point of feature support or software versions?
   I found some text about:
   ~~~
   A host must meet the following criteria to be deemed eligible for HA operations by the
KVM HA host provider:
       The host must be a member of a cluster using the KVM hypervisor
       The host must have a power management status of ON or OFF
       The version of the KVM agent deployed on the host must support performing activity
checks
       At least one volume attached to the VM(s) must support the activity check capability
       There should be at least one other host in the cluster.
   ~~~
   But its not clear for me..
   What does "The version of the KVM agent deployed on the host must support performing activity
checks" mean? - There is no such term (activity checks) in KVM docs.
   "At least one volume attached to the VM(s) must support the activity check capability"
- hot it can be determined? In what terms? I terms of storage or kvm?
   
   For example, my installation is CS 4.11.1 (KVM) + CEPH
   I can enable HA for hosts - no errors appear, but in fact all hosts are in DEGRADED state.
   And I cant understand what point I should start from to investigate the issue.
   Are there any KVMHAProvider docs? (like what are checks? how they are executed and so on)

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> Host HA
> -------
>
>                 Key: CLOUDSTACK-9782
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-9782
>             Project: CloudStack
>          Issue Type: New Feature
>      Security Level: Public(Anyone can view this level - this is the default.) 
>            Reporter: Rohit Yadav
>            Assignee: Rohit Yadav
>            Priority: Major
>             Fix For: Future, 4.11.0.0
>
>
> CloudStack lacks a way to reliably fence a host, the idea of the host-ha feature is to
provide a general purpose HA framework and implementation specific for hypervisor that can
use additional mechanism such as OOBM (ipmi based power management) to reliably investigate,
recover and fencing a host. This feature can handle scenarios associated with server crash
issues and reliable fencing of hosts and HA of VM.
> FS: https://cwiki.apache.org/confluence/display/CLOUDSTACK/Host+HA



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