Cloud-Init fails to deal with SWAP and Ephemeral if virtio-scsi is enabled

This bug was originally filed in Launchpad as [LP: #1705346](https://bugs.launchpad.net/cloud-init/+bug/1705346)

Launchpad details

affected_projects = []

assignee = None

assignee_name = None

date_closed = None

date_created = 2017-07-19T20:47:19.153070+00:00

date_fix_committed = None

date_fix_released = None

id = 1705346

importance = medium

is_complete = False

lp_url = https://bugs.launchpad.net/cloud-init/+bug/1705346

milestone = None

owner = martinx

owner_name = Thiago Martins

private = False

status = confirmed

submitter = martinx

submitter_name = Thiago Martins

tags = []

duplicates = []

_Launchpad user **Thiago Martins(martinx)** wrote on 2017-07-19T20:47:19.153070+00:00_

Hello!

In my OpenStack environment, everything works great! Including Cloud-Init.

However, I can not use virtio-blk anymore (i.e., /dev/vdX devices), because it is too slow.

I changed to virtio-scsi (i.e., /dev/sdX devices) and the IOPS is more than double!

But, after this change in Glance images, Cloud-Init is failing to make the SWAP and to mount the Ephemeral volumes.

* Here is a normal log (with virtio-blk):

http://paste.ubuntu.com/25127354/

So, after changing my Ubuntu image properties on Glance, like this:

glance image-update --property hw_scsi_model=virtio-scsi --property hw_disk_bus=scsi $UBUNTU_IMAGE_ID

Cloud Init is now failing to make the SWAP, also Ephemeral is not mounted!

* Here is the error log (with virtio-scsi):

http://paste.ubuntu.com/25127989/

Image used in Glance:

http://uec-images.ubuntu.com/releases/16.04/release/ubuntu-16.04-server-cloudimg-amd64-disk1.img

If I bring back virtio-blk, cloud-init works again (same Image, same Flavor).

But, I can't use virtio-blk because it is very slow in my system! The virtio-scsi rocks!

Cheers!
Thiago