any help for zfs on linux continuing inability to unmount zfs file systems

[Harry Putnam]

Ken D'Ambrosio <ken at jots.org> writes:

> On 2019-12-23 09:15, Harry Putnam wrote:
>> Some may be familiar with this problem if using zfs on ubuntu. That
>> is, not
>> being able to unmount a zfs file system... getting the message
>> ". . target is busy".
>
> That's not a ZFS problem at all.  That's what happens with any
> filesystem when you have files open and you're trying to dismount it.
> Do an "lsof | grep /mount/path/of/zfs" and you'll likely see some
> processes that are have something to do with that disk.  (That command
> may take up to a minute to execute, "depending.")  If you can kill
> them, do so, and then you should be able to umount the partition.

I did not think to do that ... I suspect you are right, but I will say
when I tried to google the problem I got many many hits of reports on
zfs-linux having many problems with unmount.

Thanks for the tip