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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