ZFS doing background writes?

[Dmitry Morozovsky]

On Mon, 16 Mar 2015, Steven Hartland wrote:

> yes exactly that its defined by vfs.zfs.txg.timeout.

Well, but what data (modulo atimes, which I presume OP had turned off before) 
are written?

> 
> On 16/03/2015 23:09, Dirk E wrote:
> > I'm curious now; does ZFS do any I/O on the background?
> > 
> > Because i'm getting periodic writes from ZFS to my disks, beginning right
> > after i import the pool.
> > 
> > Even going to single user mode does not help; zpool iostat -v 1 still shows
> > the writes with static 5 second interval.
> > 
> > What would cause this behaviour? I encountered it with both 10.1-RELEASE and
> > a very recent HEAD.

-- 
Sincerely,
D.Marck                                     [DM5020, MCK-RIPE, DM3-RIPN]
[ FreeBSD committer:                                 marck at FreeBSD.org ]
------------------------------------------------------------------------
*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck at rinet.ru ***
------------------------------------------------------------------------