From nobody Mon May 29 11:25:14 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 4QVCqz0mD5z4XbfQ for ; Mon, 29 May 2023 11:25:19 +0000 (UTC) (envelope-from sysadmin.lists@mailfence.com) Received: from mailout-l3b-97.contactoffice.com (mailout-l3b-97.contactoffice.com [212.3.242.97]) (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) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4QVCqy58SNz4VDw for ; Mon, 29 May 2023 11:25:18 +0000 (UTC) (envelope-from sysadmin.lists@mailfence.com) Authentication-Results: mx1.freebsd.org; none Received: from fidget.co-bxl (fidget.co-bxl [10.2.0.33]) by mailout-l3b-97.contactoffice.com (Postfix) with ESMTP id EF697229; Mon, 29 May 2023 13:25:15 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1685359515; s=20210208-e7xh; d=mailfence.com; i=sysadmin.lists@mailfence.com; h=Date:From:To:Message-ID:In-Reply-To:References:Subject:MIME-Version:Content-Type:Content-Transfer-Encoding; l=1363; bh=QuZC2HoyAVLAhFXC16VaO+2VrIzg2iiajZDBoAfIeV4=; b=36XUoKON5dPYwflxk08hG1nHftt0GY8vvRw6J7MSr2nQLHtklF7mBBk6cuJtr3PS nYYZ14e+KPzSwSMxOf3GyoKZ05OMl7+Quh62Ja6sKILC2gsa9cyRX04HXryhgnpqHqS 4vzXsVrS0l7qm+ZYkXJjxTgfKh7bgaTk/Yt0qANPDgepo7n7N2fqPy2LMSNXoQUQ5nc 6VamwYLbYcTDYyYMjQ83mjMjV2JUjzCyBJB/16X+lf0DcRRs9NJDE702fgAJVSr0zPr vI0Ss4h96EVuNIcp/hGCpX+eMXDWo8N0FWs1QfihSTlNXwPyG841YKWJiIwq6pnJRv0 Onu0aJzGxg== Date: Mon, 29 May 2023 13:25:14 +0200 (CEST) From: Sysadmin Lists To: questions@freebsd.org, David Christensen Message-ID: <1961596841.3509648.1685359514813@fidget.co-bxl> In-Reply-To: <0d0186c5-9542-1af3-2ce3-e28480b4b6d7@holgerdanske.com> References: <1957739901.520492.1685310340560@ichabod.co-bxl> <0d0186c5-9542-1af3-2ce3-e28480b4b6d7@holgerdanske.com> Subject: Re: read and write back full disk to trigger relocation 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 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Mailer: ContactOffice Mail X-ContactOffice-Account: com:312482426 X-Rspamd-Queue-Id: 4QVCqy58SNz4VDw X-Spamd-Bar: ---- X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[]; ASN(0.00)[asn:10753, ipnet:212.3.242.64/26, country:US] X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-ThisMailContainsUnwantedMimeParts: N > ---------------------------------------- > From: David Christensen > Date: May 29, 2023, 12:04:41 AM > To: > Subject: Re: read and write back full disk to 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 ... One of the examples is: gmirror label -v -b split -s 2048 data da0 da1 da2 Which tells me to look for /dev/da0, /dev/da1, /dev/da2 for the dd command. >> > > 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). > None that I'm aware of, but perhaps the ZFS source code might be illuminating. Whatever standard they used might lead to documentation for UFS. -- Sent with https://mailfence.com Secure and private email