From nobody Mon May 29 07:04:41 2023 X-Original-To: questions@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4QV64m0yPJz4XJmj for ; Mon, 29 May 2023 07:06:00 +0000 (UTC) (envelope-from dpchrist@holgerdanske.com) Received: from holgerdanske.com (holgerdanske.com [184.105.128.27]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "holgerdanske.com", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4QV64j71ltz424q for ; Mon, 29 May 2023 07:05:57 +0000 (UTC) (envelope-from dpchrist@holgerdanske.com) Authentication-Results: mx1.freebsd.org; dkim=pass header.d=holgerdanske.com header.s=nov-20210719-112354 header.b="0aRhV3/X"; spf=pass (mx1.freebsd.org: domain of dpchrist@holgerdanske.com designates 184.105.128.27 as permitted sender) smtp.mailfrom=dpchrist@holgerdanske.com; dmarc=pass (policy=none) header.from=holgerdanske.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=holgerdanske.com; s=nov-20210719-112354; t=1685343882; bh=QWpsZIny1yv7NfJk9dfXifQytSPiFG5nGHcZDFYtQhU=; h=Received:Message-ID:Date:MIME-Version:User-Agent:Subject:To: References:Content-Language:From:In-Reply-To:Content-Type: Content-Transfer-Encoding; b=0aRhV3/XZPX+w6Pw5n2206dzni01P6012E+h5VfLZlfaqw3Hr7bpETsubWSseKCZl qkP93AZJrP7f1vsWeQKwdGSStB3DQZtQEoUEjQ60WTdeTIL2ijhAYndls9L6QAShe2 aJoi2jgthDVBVU6XmzZmkskegb76zxJ5QgljXzDQVloxF7qlXvDcWeWbm2YChiXi8M 1352nhzE73FN6coZhTXsqaEwjrC12Nw/cVHfjMuODWmR/W4kmhd30vWHkcsLpzFzZ7 S1BZ75yX7AwBXsZUg8hBLy8V01q+KePFcUqnNqceImMTP5DXUzIMR+CDjhCQB9rkR1 3dG5hudhILNCQaJwzI2/JCkBLBuMa7YswDFw8WLvnh12m3cacq7uIR7bIRIiL6s25K 2dDArcuLQ/1i0zh0XceTxGPSLCGpgK3o2pxXwNmb5x5+Y1B2WJg04UVE5dwcL4g6LG ysw5eZhXkYfHUcoskhqAtW1512keWVJX41UgGzZeg46bnDQTSj/VLN3OtQ4rZpg9GS ++vHVGEls/3DSYQTQgpg13tN/8JDLM1YSHo/O2wrNCxowSYMAsjGbpouGGO0dwE/6b Rz29e6uqw9nZAkbZYT1LXVVYE267gh5/EkhdEN2Tqyuyhl37nbzHpVivU6Y1qytVy3 5E+wlU2pRKZAFaYFpvnSk3jM= Received: from 99.100.19.101 (99-100-19-101.lightspeed.frokca.sbcglobal.net [99.100.19.101]) by holgerdanske.com with ESMTPSA (TLS_AES_128_GCM_SHA256:TLSv1.3:Kx=any:Au=any:Enc=AESGCM(128):Mac=AEAD) (SMTP-AUTH username dpchrist@holgerdanske.com, mechanism PLAIN) for ; Mon, 29 May 2023 00:04:42 -0700 Message-ID: <0d0186c5-9542-1af3-2ce3-e28480b4b6d7@holgerdanske.com> Date: Mon, 29 May 2023 00:04:41 -0700 List-Id: User questions List-Archive: https://lists.freebsd.org/archives/freebsd-questions List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-questions@freebsd.org X-BeenThere: freebsd-questions@freebsd.org MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.11.0 Subject: Re: read and write back full disk to trigger relocation To: questions@freebsd.org References: <1957739901.520492.1685310340560@ichabod.co-bxl> Content-Language: en-US From: David Christensen In-Reply-To: <1957739901.520492.1685310340560@ichabod.co-bxl> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-4.00 / 15.00]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-1.00)[-1.000]; NEURAL_HAM_MEDIUM(-1.00)[-0.999]; DMARC_POLICY_ALLOW(-0.50)[holgerdanske.com,none]; R_SPF_ALLOW(-0.20)[+a]; R_DKIM_ALLOW(-0.20)[holgerdanske.com:s=nov-20210719-112354]; MIME_GOOD(-0.10)[text/plain]; DKIM_TRACE(0.00)[holgerdanske.com:+]; ASN(0.00)[asn:6939, ipnet:184.104.0.0/15, country:US]; MLMMJ_DEST(0.00)[questions@freebsd.org]; MIME_TRACE(0.00)[0:+]; FROM_EQ_ENVFROM(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; PREVIOUSLY_DELIVERED(0.00)[questions@freebsd.org]; MID_RHS_MATCH_FROM(0.00)[]; ARC_NA(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; FROM_HAS_DN(0.00)[]; TO_DN_NONE(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCVD_TLS_ALL(0.00)[] X-Rspamd-Queue-Id: 4QV64j71ltz424q X-Spamd-Bar: --- X-ThisMailContainsUnwantedMimeParts: N On 5/28/23 04:12, Artem Kuchin wrote: > I have a 3TB gmirror raid On 5/28/23 14:45, Sysadmin Lists wrote: > Artem Kuchin May 28, 2023, 4:12:21 AM >> If course i can run full disk read once in a while, but i'd rather >> prefer to read  and write the data back, so it sector >> is damaged it can trigger relocation. > > From the dd(1) manpage: > > Do a refresh of a disk drive, in order to prevent presently recoverable > read errors from progressing into unrecoverable read errors: > > dd if=/dev/ada0 of=/dev/ada0 bs=1m gmirror(8) examples indicate the device node should be: /dev/mirror/name Where "name" is the argument provided when the mirror was created: # gmirror label name prov ... > That won't trigger relocation, but it will refresh the decaying data. Do you have a URL for an engineering document or standard that describes drive sector reallocation? STFW "drive sector reallocation" I do not see anything that looks authoritative (e.g. disk manufacturer or standards body). David