zfs discuss - Oct 2008 - unloading zfs module

Is it possible to unload zfs module without rebooting the computer. 

I am making some changes in zfs kernel code. then compiling it. i then want to
reload the newly rebuilt module without rebooting.

I tried modunload. But its always givin "can''t unload the module:
Device busy" .

What can be the possible solution
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This message posted from opensolaris.org

shelly wrote:
> Is it possible to unload zfs module without rebooting the computer. 
> 
> I am making some changes in zfs kernel code. then compiling it. i then want
to reload the newly rebuilt module without rebooting.
> 
> I tried modunload. But its always givin "can''t unload the
module: Device busy" .
> 
> What can be the possible solution
If your root/boot filesystem is zfs then you won''t be able to unload
the
module.

If your root/boot filesystem is nfs or ufs then you can unload it like this:


svcadm disable -t fmd
svcadm disable -t sysevent
pools="`zpool list -H -o name`"
for p in $pools ; do
         zpool export $p
done
sleep 5
modunload -i 0
modinfo | grep zfs

If you do NOT see any output from modinfo then the unload succeeded
if you DO see output from modinfo it did not succeed.


-- 
Darren J Moffat