From owner-freebsd-current@freebsd.org Tue Mar 1 14:22:26 2016 Return-Path: Delivered-To: freebsd-current@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 435A1ABFDEF for ; Tue, 1 Mar 2016 14:22:26 +0000 (UTC) (envelope-from imb@protected-networks.net) Received: from mail.auburn.protected-networks.net (mail.auburn.protected-networks.net [IPv6:2001:470:1f07:4e1::3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mail.auburn.protected-networks.net", Issuer "Protected Networks Root CA" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 18FCD12AA for ; Tue, 1 Mar 2016 14:22:26 +0000 (UTC) (envelope-from imb@protected-networks.net) Received: from toshi.auburn.protected-networks.net (toshi.auburn.protected-networks.net [192.168.1.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "Iain Michael Butler", Issuer "Protected Networks CA" (verified OK)) (Authenticated sender: imb@mail.auburn.protected-networks.net) by mail.auburn.protected-networks.net (Postfix) with ESMTPSA id BA12D8 for ; Tue, 1 Mar 2016 09:22:23 -0500 (EST) To: freebsd-current From: Michael Butler Subject: continuous stream of writes? Openpgp: id=6F63E6399DCC8E3E94D60F0642FF6BAE0442D492 Message-ID: <56D5A59E.8040608@protected-networks.net> Date: Tue, 1 Mar 2016 09:22:22 -0500 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 01 Mar 2016 14:22:26 -0000 On an otherwise idle machine, I now see a continuous stream of writes to disk. I've only noted this over the last couple of weeks but this will not be welcome behaviour on an SSD .. How do I find the source of these writes? imb@toshi:/home/imb> iostat 10 tty ada0 cd0 pass0 cpu tin tout KB/t tps MB/s KB/t tps MB/s KB/t tps MB/s us ni sy in id 0 992 58.53 229 13.10 0.00 0 0.00 0.37 0 0.00 13 2 7 1 78 0 23 30.82 12 0.36 0.00 0 0.00 0.00 0 0.00 2 0 4 0 94 0 8 31.38 12 0.37 0.00 0 0.00 0.00 0 0.00 0 0 4 0 96 0 8 31.75 11 0.34 0.00 0 0.00 0.00 0 0.00 3 0 3 0 94 0 8 31.82 11 0.35 0.00 0 0.00 0.00 0 0.00 1 0 3 0 96 0 8 31.76 12 0.36 0.00 0 0.00 0.00 0 0.00 0 0 3 0 96 0 8 31.75 11 0.35 0.00 0 0.00 0.00 0 0.00 1 0 4 0 95 0 8 31.55 12 0.38 0.00 0 0.00 0.00 0 0.00 1 0 3 0 96