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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
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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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