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https://issues.apache.org/jira/browse/CLOUDSTACK-7072?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Likitha Shetty resolved CLOUDSTACK-7072.
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Resolution: Fixed
> [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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