From owner-freebsd-fs@freebsd.org Thu Apr 28 05:31:14 2016 Return-Path: Delivered-To: freebsd-fs@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 7912BB1F435 for ; Thu, 28 Apr 2016 05:31:14 +0000 (UTC) (envelope-from gerrit.kuehn@aei.mpg.de) Received: from umail.aei.mpg.de (umail.aei.mpg.de [194.94.224.6]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 32E26111B for ; Thu, 28 Apr 2016 05:31:13 +0000 (UTC) (envelope-from gerrit.kuehn@aei.mpg.de) Received: from mailgate.aei.mpg.de (mailgate.aei.mpg.de [194.94.224.5]) by umail.aei.mpg.de (Postfix) with ESMTP id B320620028C; Thu, 28 Apr 2016 07:31:11 +0200 (CEST) Received: from mailgate.aei.mpg.de (localhost [127.0.0.1]) by localhost (Postfix) with SMTP id A3800406ADE; Thu, 28 Apr 2016 07:31:11 +0200 (CEST) Received: from intranet.aei.uni-hannover.de (ahin1.aei.uni-hannover.de [130.75.117.40]) by mailgate.aei.mpg.de (Postfix) with ESMTP id 85634406ADB; Thu, 28 Apr 2016 07:31:11 +0200 (CEST) Received: from arc.aei.uni-hannover.de ([130.75.117.1]) by intranet.aei.uni-hannover.de (IBM Domino Release 9.0.1FP5) with ESMTP id 2016042807311099-55745 ; Thu, 28 Apr 2016 07:31:10 +0200 Date: Thu, 28 Apr 2016 07:31:11 +0200 From: Gerrit =?ISO-8859-1?Q?K=FChn?= To: Chris Watson Cc: Steven Hartland , freebsd-fs@freebsd.org Subject: Re: zfs on nvme: gnop breaks pool, zfs gets stuck Message-Id: <20160428073111.83029b9955c60622796c0202@aei.mpg.de> In-Reply-To: References: <20160427152244.ff36ff74ae64c1f86fdc960a@aei.mpg.de> <20160427141436.GA60370@in-addr.com> <5720EFD8.60900@multiplay.co.uk> Organization: Max Planck Gesellschaft X-Mailer: Sylpheed 3.4.2 (GTK+ 2.24.22; amd64-portbld-freebsd10.0) Mime-Version: 1.0 X-MIMETrack: Itemize by SMTP Server on intranet/aei-hannover(Release 9.0.1FP5|November 22, 2015) at 28/04/2016 07:31:11, Serialize by Router on intranet/aei-hannover(Release 9.0.1FP5|November 22, 2015) at 28/04/2016 07:31:11, Serialize complete at 28/04/2016 07:31:11 X-TNEFEvaluated: 1 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII X-PMX-Version: 6.0.2.2308539, Antispam-Engine: 2.7.2.2107409, Antispam-Data: 2016.4.28.52417 X-PerlMx-Spam: Gauge=IIIIIIIII, Probability=9%, Report=' MULTIPLE_RCPTS 0.1, HTML_00_01 0.05, HTML_00_10 0.05, MIME_LOWER_CASE 0.05, BODYTEXTP_SIZE_3000_LESS 0, BODY_SIZE_1000_LESS 0, BODY_SIZE_2000_LESS 0, BODY_SIZE_5000_LESS 0, BODY_SIZE_600_699 0, BODY_SIZE_7000_LESS 0, NO_URI_HTTPS 0, REFERENCES 0, __ANY_URI 0, __BOUNCE_CHALLENGE_SUBJ 0, __BOUNCE_NDR_SUBJ_EXEMPT 0, __CT 0, __CTE 0, __CT_TEXT_PLAIN 0, __FRAUD_BODY_WEBMAIL 0, __FRAUD_WEBMAIL 0, __HAS_FROM 0, __HAS_MSGID 0, __HAS_X_MAILER 0, __IN_REP_TO 0, __MIME_TEXT_ONLY 0, __MIME_VERSION 0, __MULTIPLE_RCPTS_CC_X2 0, __REFERENCES 0, __SANE_MSGID 0, __SUBJ_ALPHA_END 0, __SUBJ_ALPHA_NEGATE 0, __TO_MALFORMED_2 0, __URI_NO_WWW 0, __URI_NS ' X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 28 Apr 2016 05:31:14 -0000 On Wed, 27 Apr 2016 13:00:50 -0500 Chris Watson wrote about Re: zfs on nvme: gnop breaks pool, zfs gets stuck: CW> I think for most people, the gnop hack is what is documented on the CW> web. Hence why people are using it versus the ashift sysctl. If the CW> sysctl for ashift is not documented in the ZFS section of the CW> handbook, it probably should be. Yes, please. When you search for this, you find the gnop hack documented everywhere. This is the first time I read about the sysctl. Maybe another good idea would be to mention it in the manpage. cu Gerrit