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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CLOUDSTACK-8762) Check KVM disk files for activity before starting VM
Date Fri, 28 Aug 2015 09:25:45 GMT

    [ https://issues.apache.org/jira/browse/CLOUDSTACK-8762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14718259#comment-14718259
] 

ASF GitHub Bot commented on CLOUDSTACK-8762:
--------------------------------------------

Github user bhaisaab commented on the pull request:

    https://github.com/apache/cloudstack/pull/754#issuecomment-135709691
  
    @wido just checked again, most debug messages are in loop and changing them to info or
errors would be unnecessary. In case of error, run time exceptions are thrown that would be
captured in the logs and won't allow VMs to start.
    
    @miguelaferreira I discussed the issue of changing logic there, it seems that the mtime
should be reliable enough and I won't be adding md5 or other checksum checking logic as that
will be too slow and costing on CPU and IO. Do you still want me to refactor the logic as
a separate class or move to say FileUtil in the cloud-utils package?


> Check KVM disk files for activity before starting VM
> ----------------------------------------------------
>
>                 Key: CLOUDSTACK-8762
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-8762
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the default.) 
>            Reporter: Rohit Yadav
>            Assignee: Rohit Yadav
>             Fix For: 4.5.3, 4.6.0
>
>
> KVM hosts have real issue with fencing when storage are accessible by multiple hosts
such as in the case of NFS, in which case there is a possibility of qcow2 disks being accessed
by multiple hosts causing disk corruptions. The aim of this ticket is to explore ways to delay
starting a VM if the qcow2 disks/files are still being accessed.



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