Currently, we faced the issue that we are not able to re-provison nodes from the 5.1 env using ibp approach if partition preservation feature was applied. Main rootcase there that agent expects that 'os' vg has been created, but in 5.1 release, 'root' partition was placed on physical partion, but not on lvm volume.
As result agent fails on swap creating step:
2015-09-04T00:25:06.086632+00:00 info: 2015-09-04 00:25:05.815 1610 WARNING fuel_agent.utils.utils [-] Failed to ex
ecute command: Unexpected error while running command.
2015-09-04T00:25:06.086744+00:00 info: Command: mkswap /dev/mapper/os-swap
2015-09-04T00:25:06.086854+00:00 info: Exit code: 1
2015-09-04T00:25:06.086989+00:00 info: Stdout: ''
2015-09-04T00:25:06.087094+00:00 info: Stderr: '/dev/mapper/os-swap: No such file or directory\n'
2015-09-04T00:25:06.087204+00:00 info: 2015-09-04 00:25:05.815 1610 ERROR fuel_agent.cmd.agent [-] Unexpected error while running command.
Full agent log