1cc921cef4
In the LAMP stack workload, we found that one issue for interoperability between clouds was that in some combinations of hypervisor/adapter/storage is is necessary to rescan the scsi bus of a guest VM in order to detect a newly attached Cinder volume.[1] We neglected to do that in the K8s workload, so this patch ammends the Ansible play that formats the volume to scan the SCSI bus first. Note that the LAMP workload was targetted toward one guest OS platform (Ubuntu), and worked by installing the scsitools package and running the rescan-scsi-bus script that it provides. The K8s workload is different in that it's currently targetted toward multiple guests including Ubuntu and CoreOS [2]...the latter of which doesn't have a package manager. Rather than build conditionals into the code to handle this, I've taken a slightly simpler and more platform-agnostic approach in this patch by simply looking in /sys/class/scsi_host to see what adapters are present and then scanning each of them with an echo command. This approach has a few advantages: 1.) it works on guest OS's in which the name of the package containing the rescan-scsi-tools script is different than on Ubuntu, 2.) it works on guest OS's that don't have a package manager at all, and 3.) since it doesn't require installing any additional software, it is slightly faster and requires trivially less disk footprint. [1] https://review.openstack.org/#/c/383923/ [2] CentOS support is coming too: https://review.openstack.org/#/c/457199/ Change-Id: Ie7204a23bc7a7d1da9a8cc60e684fc987159a41a |
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