Verify/Optimize Raw Block storage support

[mcastelino]

Ensure Raw block storage is exposed via block devices (SCSI/IDE)

Kubernetes v1.13 moves raw block volume support to beta. This feature allows persistent volumes to be exposed inside containers as a block device instead of as a mounted file system.

https://kubernetes.io/blog/2019/03/07/raw-block-volume-support-to-beta/

Expected result

We need to ensure that

• Add tests to ensure that we support it
• Ensure Raw block storage is exposed via block devices (SCSI/IDE) instead of 9p/virtio-fs

[mcastelino]

/cc @amshinde @chavafg @egernst @ganeshmaharaj

[amshinde]

Will take a look @mcastelino.

[amshinde]

@mcastelino I verified this using a local Persistent volume backed by a loop-mounted block device.
I have created a gist here:
https://gist.github.com/amshinde/2ab9b5a2f2e91694a7421b1e2b787b58

I suppose we can duplicate the same in our tests. What do you think?

cc @chavafg @GabyCT

[chavafg]

yes, this can be added to the CI, we even have an sdb block device that we can use for this.

[amshinde]

@chavafg Lets add a test for this in our CI then leveraging the sdb device.

[amshinde]

Closed with kata-containers/tests#1358