If you have a separate ZIL device is there any way to scrub the data in it?

I appreciate that the data in the ZIL is only there for a short time but since 
it is never read if you had a misbehaving ZIL device that was just throwing the 
data away you could potentially run like this for many months and only discover 
the problem when you reboot and go to read the ZIL to replay it.

So is there anyway to verify the ZIL device is working as expected (ie can 
return the data written into it) while the system is running?

--chris
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