starcluster createvolume -n erik_DC_vol2 -m mkfs.xfs 50 us-east-1a
!!! ERROR - command not found on remote system: 'mkfs.xfs'
This error is due to the fact that the latest AMIs do not have the XFS utilities installed. I will install them in the next round of AMIs. Thanks for reporting :D
BTW, IIRC you can install them using:
$ apt-get install xfsprogs
You could then rebundle the AMI until the next round of AMIs are out.