Comment 3 for bug 1729584

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Logan V (loganv) wrote : Re: boot from volume + configdrive broken

It seems like these 2 out of order virtio-scsi issues described above relating to secondary volumes and config drives ending up as index 0 are probably a regression introduced in https://review.openstack.org/#/q/topic:bug/1686116

This seriously impacts our environment due to heavy RBD use in nova/cinder. Most of our instances have at least some type of virtio-scsi backed disk. We've found that any instance using config drive or boot from volume + storage volume(s) is at risk of having an unbootable instance in Ocata or later when virtio-scsi is used.