From owner-freebsd-stable@freebsd.org Sun Apr 12 13:20:25 2020 Return-Path: Delivered-To: freebsd-stable@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 857A62BDD51 for ; Sun, 12 Apr 2020 13:20:25 +0000 (UTC) (envelope-from bounces+13739864-b44a-freebsd-stable=freebsd.org@em848.distal.com) Received: from xtrwsqdf.outbound-mail.sendgrid.net (xtrwsqdf.outbound-mail.sendgrid.net [167.89.100.223]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) server-signature RSA-PSS (4096 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 490XRr2lDrz478w for ; Sun, 12 Apr 2020 13:20:23 +0000 (UTC) (envelope-from bounces+13739864-b44a-freebsd-stable=freebsd.org@em848.distal.com) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=distal.com; h=content-type:mime-version:subject:from:in-reply-to: content-transfer-encoding:references:to:cc; s=s1; bh=WYqxpc1adOll+mtuDwxovREymLQos3B+wD6ACe2U3Ck=; b=pkafHskaxmtykKMShvg99PqDiNQENOLQ9DJcMV/U0Yc8aDiHe/XljOXX7inNo40v5hKp dumzzvETazBsA68AbLe10B+GEfRMFRCelgdKpbbhHPyX9reTF0dkhsN6bJUzEonxx84va5 mt+xElHHcbjWphhXp1K9aFT/76RpiOFWU= Received: by filterdrecv-p3iad2-8ddf98858-f4h4l with SMTP id filterdrecv-p3iad2-8ddf98858-f4h4l-19-5E931596-27 2020-04-12 13:20:22.507713452 +0000 UTC m=+1512775.826945572 Received: from mail.distal.com (unknown) by ismtpd0025p1iad2.sendgrid.net (SG) with ESMTP id PjDEVoWgQhSsgK5MrtNgFg Sun, 12 Apr 2020 13:20:22.476 +0000 (UTC) Received: from magrathea.distal.com (magrathea.distal.com [2001:470:e24c:200:14a4:6888:ae02:b3bb]) by tristain.distal.com (OpenSMTPD) with ESMTPSA id 6b1cb353 (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256:NO); Sun, 12 Apr 2020 09:20:21 -0400 (EDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.80.23.2.2\)) Subject: Re: ZFS server has gone crazy slow From: Chris Ross In-Reply-To: <89932f19-6aac-5b45-646a-04ceecaaa19d@grosbein.net> Date: Sun, 12 Apr 2020 13:20:22 +0000 (UTC) Content-Transfer-Encoding: quoted-printable Message-Id: <1B88FA01-D6F5-43BC-9351-9076079DC62D@distal.com> References: <2182C27C-A5D3-41BF-9CE9-7C6883E43074@distal.com> <68328a40-0e3d-f9cf-510b-9cbfd7cb8acd@grosbein.net> <654D00F8-DBEC-49BD-B871-7EB830F49D50@distal.com> <89932f19-6aac-5b45-646a-04ceecaaa19d@grosbein.net> X-Mailer: Apple Mail (2.3608.80.23.2.2) X-SG-EID: =?us-ascii?Q?gDj=2Futz1vvM0Gg5Dx3C984MHE5rSknXbUiMX+7YYKy8H35YTA3nJpmg1IQ5mw9?= =?us-ascii?Q?RS2bD=2FH4Uluvnmedtzs9ncXZeNzx2s3PcCGHPFc?= =?us-ascii?Q?E6Y8lnSeWGLBN8tUpm6t6RbW6HAjtWjUN+i5ukY?= =?us-ascii?Q?SlnlrviL99ML3FfFoXgb5xRhUMfmg2zx74kiuOa?= =?us-ascii?Q?NKm00+BKqddYCLmkdbezLj0n2fZDU7REV5NCb2e?= =?us-ascii?Q?B15rsQKbGJ5PepOHWy6L4sKCtljvCZAbqMDvYfs?= =?us-ascii?Q?gOT=2FP7cuBSB5Ft5r8yarQ=3D=3D?= To: Eugene Grosbein Cc: freebsd-stable@freebsd.org X-Rspamd-Queue-Id: 490XRr2lDrz478w X-Spamd-Bar: ----- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=distal.com header.s=s1 header.b=pkafHska; dmarc=pass (policy=none) header.from=distal.com; spf=pass (mx1.freebsd.org: domain of bounces@em848.distal.com designates 167.89.100.223 as permitted sender) smtp.mailfrom=bounces@em848.distal.com X-Spamd-Result: default: False [-5.04 / 15.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; R_DKIM_ALLOW(-0.20)[distal.com:s=s1]; MID_RHS_MATCH_FROM(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; R_SPF_ALLOW(-0.20)[+ip4:167.89.0.0/17]; MV_CASE(0.50)[]; MIME_GOOD(-0.10)[text/plain]; IP_SCORE(-2.84)[ip: (-5.87), ipnet: 167.89.96.0/20(-4.61), asn: 11377(-3.67), country: US(-0.05)]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; RCVD_COUNT_THREE(0.00)[3]; TO_MATCH_ENVRCPT_SOME(0.00)[]; DKIM_TRACE(0.00)[distal.com:+]; RCPT_COUNT_TWO(0.00)[2]; DMARC_POLICY_ALLOW(-0.50)[distal.com,none]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; FORGED_SENDER(0.30)[cross@distal.com,bounces@em848.distal.com]; RWL_MAILSPIKE_POSSIBLE(0.00)[223.100.89.167.rep.mailspike.net : 127.0.0.17]; MIME_TRACE(0.00)[0:+]; RCVD_TLS_LAST(0.00)[]; ASN(0.00)[asn:11377, ipnet:167.89.96.0/20, country:US]; TAGGED_FROM(0.00)[13739864-b44a-freebsd-stable=freebsd.org,freebsd]; FROM_NEQ_ENVFROM(0.00)[cross@distal.com,bounces@em848.distal.com] X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 12 Apr 2020 13:20:25 -0000 > On Apr 12, 2020, at 01:48, Eugene Grosbein wrote: >=20 > There is very simple way to prevent such problem, use: zfs set reservatio= n=3D1G > for single "root" file system of the pool. >=20 > This way ZFS won't allow applications to fill the pool to the point it st= arts crawling. > Instead, writing applications would obtain ENOSPC error when pool's free = space hits the limit. Done. Thank you for that good advice! In case this system develops the same issue in another year or three and I=E2=80=99ve forgotten this, it wil= l yell at me before getting so logged down. - Chris