Unable to create ZVOL error since upgrading to 9.3-RELEASE

[Paul Mather]

On Jul 30, 2014, at 10:22 AM, Paul Mather <freebsd-lists at gromit.dlib.vt.edu> wrote:

> I have a nightly backup job that creates a snapshot of my ZFS pool, 
> mounts the snapshot file sets appropriately under /backup, and then 
> rsyncs that hierarchy to another system.  This worked fine under 
> 9.2-RELEASE and before.
> 
> Since upgrading to 9.3-RELEASE, I get the following error in the daily 
> security run output for that machine:
> 
> =====
> redmine kernel log messages:
> +++ /tmp/security.6itlEbCD	2014-07-30 03:01:10.401183488 -0400
> +ZFS WARNING: Unable to create ZVOL sys/SWAP/swap at backup (error=17).
> =====
> 
> I have swap on a ZFS ZVOL: sys/SWAP/swap.  I create the snapshot via 
> "zfs snapshot -r sys at backup" ("sys" is the name of my ZFS pool).
> 
> Does anyone know why I should be getting this error now?  The same 
> script running on the same machine gave no problems under 9.2-RELEASE.  
> I started getting this message as soon as I upgraded to 9.3-RELEASE.
> 
> Did some sysctl default change between 9.2-RELEASE and 9.3-RELEASE that 
> changed the behaviour of ZVOLs and snapshots?
> 
> The message isn't fatal, but it is annoying to have it appear every day 
> in the security run output.
> 
> Cheers,
> 
> Paul.


I didn't get any responses to this, but, as a followup, I decided to 
upgrade that system to 10.0-RELEASE-p7 and now the problem no longer 
occurs.  So, I figure this must be something peculiar to 9.3-RELEASE.

Cheers,

Paul.