rbd: sysfs write failed rbd: map failed: (2) No such file or directory

[blackrhino]

$ sudo rbd map data1 --id rbd
rbd: sysfs write failed
In some cases useful info is found in syslog - try "dmesg | tail" or so.
rbd: map failed: (2) No such file or directory

This in this case the error was due to the data1 device, which did not exist.
You can verify device on your client using the following command.

$ rbd ls --id rbd