From owner-freebsd-fs@FreeBSD.ORG Mon Mar 16 23:47:25 2015 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 1B8B3176 for ; Mon, 16 Mar 2015 23:47:25 +0000 (UTC) Received: from mail-wg0-f54.google.com (mail-wg0-f54.google.com [74.125.82.54]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id A7120AD8 for ; Mon, 16 Mar 2015 23:47:23 +0000 (UTC) Received: by wgdm6 with SMTP id m6so52436860wgd.2 for ; Mon, 16 Mar 2015 16:47:22 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:message-id:date:from:user-agent:mime-version:to :subject:references:in-reply-to:content-type :content-transfer-encoding; bh=k5HHvXevh8aGbaUrY36P8wyzDgjjoLCP5nwNGvyS+fg=; b=XSr5tXICG4rk9ctxMMoslGbPNCsKvjqmAPof6YSx9OTIpc/ZX/s7OBFq+J5u/hsvwM N+f8moT5LZZgFg7YoP5Pzg2DES7Of3EJsBVZbgeVy0rVg2SJ5r+rnKjGK2Bks0DI1+S7 pc9lxa9D2WPCmS1RcEvLaKSjcoqxeG11DxHe2ByOn14VUBqHwPgRdJNm521PenvIY/Gm mPKit7JosWWl2fqwVcKnokklBTIwdOyY4uKExW7lq43+wcnF3eps4g44qqoe9SuFdcdw 59AfX4Z23/jp+E23KzF5Kj1KS0Y/kzf7UoKvNTLNDq+izJk+0WBPqdMv4mrdVWUZLncO X9Rw== X-Gm-Message-State: ALoCoQkRro0MTvnIWyRDKDvSY9nAhQEvAymLshgwSdbWMIbqrgVFM681Q4MW3xn3Uf1e5wLjsFnf X-Received: by 10.194.142.205 with SMTP id ry13mr130419610wjb.73.1426549642367; Mon, 16 Mar 2015 16:47:22 -0700 (PDT) Received: from [10.10.1.68] (82-69-141-170.dsl.in-addr.zen.co.uk. [82.69.141.170]) by mx.google.com with ESMTPSA id dj5sm17498450wjb.28.2015.03.16.16.47.21 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 16 Mar 2015 16:47:21 -0700 (PDT) Message-ID: <55076B84.0@multiplay.co.uk> Date: Mon, 16 Mar 2015 23:47:16 +0000 From: Steven Hartland User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 MIME-Version: 1.0 To: freebsd-fs@freebsd.org Subject: Re: ZFS doing background writes? References: In-Reply-To: Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Mar 2015 23:47:25 -0000 yes exactly that its defined by vfs.zfs.txg.timeout. 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. > > _______________________________________________ > freebsd-fs@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-fs > To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org"