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Precondition: the node use multipath service.
Operation: unmap the rbd volume after mapping the volume to node
Error phenomenon:
[root@2C5_19_CG1 ~(keystone_admin)]# rbd unmap /dev/rbd5
rbd: sysfs write failed
rbd: unmap failed: (16) Device or resource busy
Causal analysis: the rbd volume was taken over by multipath service
** Affects: multipath-tools (Ubuntu)
Importance: Undecided
Status: New
** Tags: ceph multipath
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the rbd volume can not unmap when using multipath service
https://bugs.launchpad.net/bugs/1581764
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