[jira] [Commented] (CLOUDSTACK-7072) [VMware] Volume attachment intermittently fails with 'A specified parameter was not correct' error.

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    [ https://issues.apache.org/jira/browse/CLOUDSTACK-7072?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14053591#comment-14053591 ] 

ASF subversion and git services commented on CLOUDSTACK-7072:
-------------------------------------------------------------

Commit 4be369c94c4c9a2609f922fa414178191753c8bd in cloudstack's branch refs/heads/master from [~likithas]
[ https://git-wip-us.apache.org/repos/asf?p=cloudstack.git;h=4be369c ]

CLOUDSTACK-7072. Volume attachment fails with 'A specified parameter was not correct' error.
[VMware] While attaching a new disk to an instance, the unit number on the controller key should be the lowest unit number on the key that is not in use.
Instead of a number that is 1 digit higher the highest unit number that is currently in use.


> [VMware] Volume attachment intermittently fails with 'A specified parameter was not correct' error.
> ---------------------------------------------------------------------------------------------------
>
>                 Key: CLOUDSTACK-7072
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-7072
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the default.) 
>          Components: VMware, Volumes
>    Affects Versions: 4.4.0
>            Reporter: Likitha Shetty
>            Assignee: Likitha Shetty
>             Fix For: 4.5.0
>
>
> Today, while attaching a new disk to an instance the unit number on the controller key chosen for the disk is 1 digit higher than the highest unit number that is currently in use.
> Hence we could run into potential volume attach failures. If we try to attach 15 or more volumes to the same instance and call attach and detach in fast succession it will result in us calling disk attach for a disk before the detach of the volume on the controller key with the highest unit number. In this case every volume will get a unit number that is one more than the highest, even though the lower unit numbers are not in use. So CS will try to attach the 15th data volume with SCSI id 16 even though the lower unit numbers are not in use and this attach will fail because there are only 16 devices on a SCSI bus.



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