From owner-freebsd-questions@freebsd.org Mon Jan 21 12:10:34 2019 Return-Path: Delivered-To: freebsd-questions@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 9397614A73A2 for ; Mon, 21 Jan 2019 12:10:34 +0000 (UTC) (envelope-from yasu@utahime.org) Received: from gate.utahime.jp (ipq210.utahime.jp [183.180.29.210]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id C7C658601D for ; Mon, 21 Jan 2019 12:10:31 +0000 (UTC) (envelope-from yasu@utahime.org) Received: from eastasia.home.utahime.org (eastasia.home.utahime.org [192.168.174.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by gate.utahime.jp (Postfix) with ESMTPS id 91DA079F7; Mon, 21 Jan 2019 21:10:19 +0900 (JST) Received: from eastasia.home.utahime.org (localhost [127.0.0.1]) by localhost-backdoor.home.utahime.org (Postfix) with ESMTP id 0386C53604; Mon, 21 Jan 2019 21:10:19 +0900 (JST) Received: from localhost (rolling.home.utahime.org [192.168.174.11]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by eastasia.home.utahime.org (Postfix) with ESMTPSA id 4579F53603; Mon, 21 Jan 2019 21:10:18 +0900 (JST) Date: Mon, 21 Jan 2019 21:09:41 +0900 (JST) Message-Id: <20190121.210941.2275299827563542964.yasu@utahime.org> To: freebsd-questions@freebsd.org Subject: Performance degradation of ZFS? From: Yasuhiro KIMURA X-Mailer: Mew version 6.8 on Emacs 26.1 Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Virus-Scanned: ClamAV using ClamSMTP X-Rspamd-Queue-Id: C7C658601D X-Spamd-Bar: ++ Authentication-Results: mx1.freebsd.org; spf=pass (mx1.freebsd.org: domain of yasu@utahime.org designates 183.180.29.210 as permitted sender) smtp.mailfrom=yasu@utahime.org X-Spamd-Result: default: False [2.30 / 15.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; NEURAL_HAM_MEDIUM(-0.49)[-0.494,0]; FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(-0.20)[+a:spf-authorized.utahime.org]; MV_CASE(0.50)[]; MIME_GOOD(-0.10)[text/plain]; TO_DN_NONE(0.00)[]; DMARC_NA(0.00)[utahime.org]; RCPT_COUNT_ONE(0.00)[1]; RCVD_COUNT_THREE(0.00)[4]; SUBJECT_ENDS_QUESTION(1.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MX_GOOD(-0.01)[mx1.utahime.org,mx2.utahime.org]; NEURAL_SPAM_LONG(0.14)[0.139,0]; MID_CONTAINS_FROM(1.00)[]; NEURAL_SPAM_SHORT(0.29)[0.294,0]; IP_SCORE(0.18)[ip: (0.40), ipnet: 183.180.0.0/16(0.20), asn: 2519(0.36), country: JP(-0.08)]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:2519, ipnet:183.180.0.0/16, country:JP]; RCVD_TLS_LAST(0.00)[] X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 Jan 2019 12:10:34 -0000 Hello, Last month I upgraded my home server from 11.2-RELEASE to 12.0-RELEASE. It is ZFS only system. After making full data backup with tar(1) I made clean install of 12.0-RELEASE and restored backuped data. Then there is significant improvement of I/O performance. Is it possible that I/O performance degrade while using ZFS for a long time? And if answer is yes is there any way to recover performance without making full backup and restore? Best Regards. --- Yasuhiro KIMURA