I am testing MapR running on OpenStack without Sahara and notice some peculiar issues regarding disk format.
My current environment is based on Mitaka and have a small cluster with glusterfs as backend storage. Using the normal mapr-setup.sh way of installation, I always get errors while formatting the disks (attached as volumes). But if I define the disk as ephemeral (created as part of a flavor), it seems fine.
Using the gluster volumes is fine for other purpose (VMs).
Thanks in advance