Date: Tue, 17 Mar 2015 04:52:10 +0300 (MSK) From: Dmitry Morozovsky <marck@rinet.ru> To: Steven Hartland <killing@multiplay.co.uk> Cc: freebsd-fs@freebsd.org Subject: Re: ZFS doing background writes? Message-ID: <alpine.BSF.2.00.1503170451150.82898@woozle.rinet.ru> In-Reply-To: <55076B84.0@multiplay.co.uk> References: <DUB131-W446C7C68BD022D901F040697020@phx.gbl> <55076B84.0@multiplay.co.uk>
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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@FreeBSD.org ] ------------------------------------------------------------------------ *** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck@rinet.ru *** ------------------------------------------------------------------------
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