When did ZFS support snapshotting during a scrub?

[Freddie Cash]

That was only an issue with ZFSv6 from 7.x.

ZFSv19 and above allow snapshots during scrubs.
On 2013-02-11 4:19 PM, "Darren Pilgrim" <list_freebsd at bluerosetech.com>
wrote:

> The other day I discovered that my 8.3-R systems (zpool v28, ZFS v4) will
> let me create and destroy snapshots when a scrub is running.  This was not
> the case in $previous_version, but a quick scan of release notes doesn't
> mention it.  I believe you couldn't snapshot during a scrub in 8.1-R, but
> I'm not sure.  Does anyone know which ZFS/zpool version removed this
> restriction?
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