[jira] [Commented] (CLOUDSTACK-9782) Host HA

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ 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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