Internally zpool export will call unshare and umount, so a "pool is
busy" indicates that process(es) has/have one or more files open and so
this operation fails.
One can check for these processes using either:
lsof -Pn
or
fuser -vm /poolname
(where poolname is the name of your pool)
and it's worth checking the status of the pool using:
zpool status -v
** Changed in: zfs-linux (Ubuntu)
Status: In Progress => Incomplete
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https://bugs.launchpad.net/bugs/1667838
Title:
zpool export mpu1pool cannot export 'mpu1pool': pool is busy
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