From owner-freebsd-fs@freebsd.org Thu Jul 26 02:32:09 2018 Return-Path: Delivered-To: freebsd-fs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 8016F105B48A for ; Thu, 26 Jul 2018 02:32:09 +0000 (UTC) (envelope-from mi+m@aldan.algebra.com) Received: from mailman.ysv.freebsd.org (mailman.ysv.freebsd.org [IPv6:2001:1900:2254:206a::50:5]) by mx1.freebsd.org (Postfix) with ESMTP id 12EBF77812 for ; Thu, 26 Jul 2018 02:32:09 +0000 (UTC) (envelope-from mi+m@aldan.algebra.com) Received: by mailman.ysv.freebsd.org (Postfix) id CBCFD105B482; Thu, 26 Jul 2018 02:32:08 +0000 (UTC) Delivered-To: fs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id BA849105B481 for ; Thu, 26 Jul 2018 02:32:08 +0000 (UTC) (envelope-from mi+m@aldan.algebra.com) Received: from natasha.teterin.net (symbion.zaytman.com [64.112.176.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "symbion", Issuer "Narawntapu" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 30B147780C for ; Thu, 26 Jul 2018 02:32:07 +0000 (UTC) (envelope-from mi+m@aldan.algebra.com) Received: from [100.106.130.79] (32.sub-174-202-27.myvzw.com [174.202.27.32]) (authenticated bits=0) by natasha.teterin.net (8.15.2/8.15.2) with ESMTPSA id w6Q2Vrg1012609 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Wed, 25 Jul 2018 22:31:54 -0400 (EDT) (envelope-from mi+m@aldan.algebra.com) X-Authentication-Warning: natasha.teterin.net: Host 32.sub-174-202-27.myvzw.com [174.202.27.32] claimed to be [100.106.130.79] Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (1.0) Subject: Re: core dumps onto ZFS From: "Mikhail T." X-Mailer: iPhone Mail (15F79) In-Reply-To: <201807252259.w6PMxhDt055842@chez.mckusick.com> Date: Wed, 25 Jul 2018 22:31:48 -0400 Cc: "Mikhail T." , fs@freebsd.org Content-Transfer-Encoding: quoted-printable Message-Id: <2EEED9B8-A743-4901-8539-9A8C2E42ED21@aldan.algebra.com> References: <201807252259.w6PMxhDt055842@chez.mckusick.com> To: Kirk McKusick X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Jul 2018 02:32:09 -0000 No, most certainly not. In fact, it is hardly used at all... Only about 15% o= f the 9TB... Maybe, the log-device filled up - not sure. Could core-dumping be bypassing something, thus triggering what normal writi= ng would not? --=20 Sent from mobile device, please, pardon shorthand. 25 =D0=BB=D0=B8=D0=BF. 2018 =D1=80. =D0=BE 18:59 Kirk McKusick =D0=BF=D0=B8=D1=88=D0=B5: > Is there any chance that your filesystem was more than 90% full? >=20 > Once ZFS gets past 90% full its performance drops precipitously. > As it approaches completely full it locks up for minutes per write > doing huge numbers of writes to its pool in an attempt to consolodate > what little free space it has left into something big enough for > it to use (which it sounds like is happening to you). >=20 > Kirk McKusick