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https://issues.apache.org/jira/browse/CLOUDSTACK-8862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15894943#comment-15894943
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ASF GitHub Bot commented on CLOUDSTACK-8862:
--------------------------------------------
Github user ramkatru commented on the issue:
https://github.com/apache/cloudstack/pull/1900
tag:mergeready
> Issuing multiple attach-volume commands simultaneously can be problematic
> -------------------------------------------------------------------------
>
> Key: CLOUDSTACK-8862
> URL: https://issues.apache.org/jira/browse/CLOUDSTACK-8862
> Project: CloudStack
> Issue Type: Bug
> Security Level: Public(Anyone can view this level - this is the
> default.)
> Components: Management Server
> Affects Versions: 4.5.0, 4.5.1, 4.5.2, 4.6.0
> Environment: N/A
> Reporter: Mike Tutkowski
> Fix For: Future
>
>
> If a user submits two volumeAttach commands around the same time, the first
> one can succeed while the second one can fail and can lead CloudStack to ask
> the underlying storage plug-in to remove the volume from a given ACL (but the
> volume should be in the ACL because the first attachVolume command succeeded).
> A somewhat similar problem can happen if you submit the second attachVolume
> command to another VM in the same cluster.
> Proposed solution:
> A data volume should make use of a new column in the volumes table:
> attach_state (or some name like that).
> This column can have five possible values: null (for root disks), detached
> (default state for data volumes), attaching, attached, and detaching.
> When an attachVolume command is submitted, the volume should immediately be
> placed into the "attaching" state. If a transition to that state is not
> possible, an exception is thrown (for example, if you're already in the
> "attached" state, you can't transition to the "attaching" state).
> A similar kind of logic already exists for volume snapshots.
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