Here's one of my nodes that can't unmap a device:
[root@nodebr6 ~]# rbd unmap /dev/rbd0
2016-04-27 11:36:56.975668 7fcd61ae67c0 -1 did not load config file, using
default settings.
Option -q no longer supported.
rbd: run_cmd(udevadm): exited with status 1
rbd: sysfs write failed
rbd: unmap failed: (16) Device or resource busy
[root@nodebr6 ~]# fuser -amv /dev/rbd0
USER PID ACCESS COMMAND
/dev/rbd0:
[root@nodebr6 ~]# ll /sys/block/rbd0/holders/
total 0
This is a Centos 7.2 (3.10.0-327.4.5.el7.x86_64)
---
Diego Castro / The CloudFather
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