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From: "Steven Hartland" <killing@multiplay.co.uk>
To: "Steven Hartland" <killing@multiplay.co.uk>,
 "Nikolay Denev" <ndenev@gmail.com>
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Subject: Re: Unable to create ZVOL (error=6)
Date: Sun, 5 Oct 2014 19:42:56 +0100
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> ----- Original Message ----- 
> From: "Steven Hartland"
> 
>> ----- Original Message ----- 
>> From: "Nikolay Denev" <ndenev@gmail.com>
>> 
>>> I'm not taking other steps, and I'm running "FreeBSD nas.home.lan
>>> 10.0-STABLE FreeBSD 10.0-STABLE #13 r270295M: Thu Aug 21 22:05:37 UTC
>>> 2014     root@nas.home.lan:/usr/obj/usr/src/sys/NAS  amd64"
>>> 
>>> Can you try to set volmode back to "geom", so that you can create a
>>> snapshot that creates a cdev in /dev/zvol, and then set it to "dev"
>>> again, and try a new snapshot?
>> 
>> No change, still no /dev/zvol
> 
> Are you sure you didn't create the volumes with a -V? As thats what
> should triggers zvol creation.
> 
> Can you try updating to the latest stable/10 to see if its still
> present?

To confirm this, whats the output from:
zfs get -r type zfs